ESP and DHT22 LOW MEMORY

[espruino-discuss3]

Posted at 2019-08-14 by Linyx

Hi. I'm use esp32-wroom-32 and DHT22 sensor with DHT22.js script.

I call the read function every 5 seconds and every time I get less and less memory, the log below as it was at the beginning of work was 1917, and after a while it was already 1887 and so on until there is an error.

What my problem?

My code:

  setInterval(function() {
    this.dht.read((response) => {

      console.log(response)
      console.log(process.memory())
      console.log('_____')

    });
  }, 5000);
    

My logs:

 ____                 _
|  __|___ ___ ___ _ _|_|___ ___
|  __|_ -| . |  _| | | |   | . |
|____|___|  _|_| |___|_|_|_|___|
         |_| espruino.com
 2v04 (c) 2019 G.Williams
Espruino is Open Source. Our work is supported
only by sales of official boards and donations:
http://espruino.com/Donate
>
{
  "raw": "100000010001011010000000011100001000100001",
  "rh": 111.4, "temp": 45 }
{ "free": 1917, "usage": 383, "total": 2300, "history": 179,
  "gc": 0, "gctime": 1.989 }
_____
{
  "raw": "010000001000101100000000001110000100001111",
  "rh": 55.6, "temp": 22.5 }
{ "free": 1929, "usage": 371, "total": 2300, "history": 179,
  "gc": 0, "gctime": 1.954 }
_____
{
  "raw": "010000001000110010000000001110000100010101",
  "rh": 56.2, "temp": 22.5 }
{ "free": 1926, "usage": 374, "total": 2300, "history": 179,
  "gc": 0, "gctime": 1.96 }
_____
{
  "raw": "010000001000110100000000001110000100010111",
  "rh": 56.4, "temp": 22.5 }
{ "free": 1922, "usage": 378, "total": 2300, "history": 179,
  "gc": 0, "gctime": 1.956 }
_____
{
  "raw": "010000001000110001000000001110001000010101",
  "rh": 56.1, "temp": 22.6 }
{ "free": 1919, "usage": 381, "total": 2300, "history": 179,
  "gc": 0, "gctime": 1.965 }
_____
{
  "raw": "010000001000101000000000001110001000001100",
  "rh": 55.2, "temp": 22.6 }
{ "free": 1915, "usage": 385, "total": 2300, "history": 179,
  "gc": 0, "gctime": 1.958 }
_____
{
  "raw": "010000001000101000000000001110001000001100",
  "rh": 55.2, "temp": 22.6 }
{ "free": 1912, "usage": 388, "total": 2300, "history": 179,
  "gc": 0, "gctime": 1.96 }
_____
{
  "raw": "010000001000110001000000001110001000010101",
  "rh": 56.1, "temp": 22.6 }
{ "free": 1908, "usage": 392, "total": 2300, "history": 179,
  "gc": 0, "gctime": 1.964 }
_____
{
  "raw": "010000001001010011000000001110001000110111",
  "rh": 59.5, "temp": 22.6 }
{ "free": 1905, "usage": 395, "total": 2300, "history": 179,
  "gc": 0, "gctime": 1.961 }
_____
{
  "raw": "010000001001010111000000001110001000111011",
  "rh": 59.9, "temp": 22.6 }
{ "free": 1901, "usage": 399, "total": 2300, "history": 179,
  "gc": 0, "gctime": 1.967 }
_____
{
  "raw": "010000001001010011000000001110001000110111",
  "rh": 59.5, "temp": 22.6 }
{ "free": 1898, "usage": 402, "total": 2300, "history": 179,
  "gc": 0, "gctime": 1.963 }
_____
{
  "raw": "010000001001001001000000001110001000101101",
  "rh": 58.5, "temp": 22.6 }
{ "free": 1894, "usage": 406, "total": 2300, "history": 179,
  "gc": 0, "gctime": 1.969 }
_____
{
  "raw": "010000001000111011000000001110001000011111",
  "rh": 57.1, "temp": 22.6 }
{ "free": 1887, "usage": 413, "total": 2300, "history": 179,
  "gc": 0, "gctime": 1.966 }
_____

[espruino-discuss3]

Posted at 2019-08-14 by AkosLukacs

As always, check you wiring. Loose wire can lead to communication errors. And the DHT22 uses a single wire bit-banged protocol, that's not as robust as for example I2C or SPI.

The DHT22 module does retry up to 10 times by default if can't communicate with the DHT22 or there is a CRC error. With 500ms delay between each retry, worst case that's over your 5000ms interval.
If you have a logic analyzer (even a <10USD one), you can check the communication for retries.
Or if not, you can log the time between the start and end:

  setInterval(function() {
    var t0 = new Date
    this.dht.read((response) => {
      var t1 = new Date()
      console.log(response)
      console.log(process.memory())
      console.log('start:', t0, 'end:', t1, 'elapsed:', t1-t0)
      console.log('_____')
    });
  }, 5000);

And if my theory is right, you will see some corelation in over 5 second communication and memory leak. Then you can either increase the interval to ~10 seconds, or you can pass in a lower retry count.

---

Posted at 2019-08-14 by Linyx

I not have analyser...

Log:

 ____                 _
|  __|___ ___ ___ _ _|_|___ ___
|  __|_ -| . |  _| | | |   | . |
|____|___|  _|_| |___|_|_|_|___|
         |_| espruino.com
 2v04 (c) 2019 G.Williams
Espruino is Open Source. Our work is supported
only by sales of official boards and donations:
http://espruino.com/Donate
>WARNING: Scan stop failed
WARNING: set rssi scan not implemeted yet
 ____                 _
|  __|___ ___ ___ _ _|_|___ ___
|  __|_ -| . |  _| | | |   | . |
|____|___|  _|_| |___|_|_|_|___|
         |_| espruino.com
 2v04 (c) 2019 G.Williams
Espruino is Open Source. Our work is supported
only by sales of official boards and donations:
http://espruino.com/Donate
>
{
  "raw": "100000010010101010000000011001100001000111",
  "rh": 119.4, "temp": 40.8 }
{ "free": 1872, "usage": 428, "total": 2300, "history": 202,
  "gc": 0, "gctime": 1.99 }
start: Date: Thu Jan 1 1970 00:00:36 GMT+0000 end: Date: Thu Jan 1 1970 00:00:41 GMT+0000 elapsed: 41829.603
_____
{
  "raw": "010000001001010110000000001100110100100101",
  "rh": 59.8, "temp": 20.5 }
{ "free": 1884, "usage": 416, "total": 2300, "history": 202,
  "gc": 0, "gctime": 1.956 }
start: Date: Thu Jan 1 1970 00:00:41 GMT+0000 end: Date: Thu Jan 1 1970 00:00:42 GMT+0000 elapsed: 42525.681
_____
{
  "raw": "010000001001010110000000001100110100100101",
  "rh": 59.8, "temp": 20.5 }
{ "free": 1881, "usage": 419, "total": 2300, "history": 202,
  "gc": 0, "gctime": 1.957 }
start: Date: Thu Jan 1 1970 00:00:46 GMT+0000 end: Date: Thu Jan 1 1970 00:00:46 GMT+0000 elapsed: 46926.537
_____
{
  "raw": "010000001001010011000000001100110100100010",
  "rh": 59.5, "temp": 20.5 }
{ "free": 1877, "usage": 423, "total": 2300, "history": 202,
  "gc": 0, "gctime": 1.958 }
start: Date: Thu Jan 1 1970 00:00:51 GMT+0000 end: Date: Thu Jan 1 1970 00:00:51 GMT+0000 elapsed: 51926.504
_____
{
  "raw": "010000001001010011000000001100110100100010",
  "rh": 59.5, "temp": 20.5 }
{ "free": 1874, "usage": 426, "total": 2300, "history": 202,
  "gc": 0, "gctime": 1.958 }
start: Date: Thu Jan 1 1970 00:00:56 GMT+0000 end: Date: Thu Jan 1 1970 00:00:56 GMT+0000 elapsed: 56926.781
_____
{
  "raw": "010000001001001101000000001100110100011100",
  "rh": 58.9, "temp": 20.5 }
{ "free": 1867, "usage": 433, "total": 2300, "history": 202,
  "gc": 0, "gctime": 1.961 }
start: Date: Thu Jan 1 1970 00:01:01 GMT+0000 end: Date: Thu Jan 1 1970 00:01:02 GMT+0000 elapsed: 62636.94
_____
{
  "raw": "010000001001011000000000001100110100100111",
  "rh": 60, "temp": 20.5 }
{ "free": 1863, "usage": 437, "total": 2300, "history": 202,
  "gc": 0, "gctime": 1.961 }
start: Date: Thu Jan 1 1970 00:01:06 GMT+0000 end: Date: Thu Jan 1 1970 00:01:06 GMT+0000 elapsed: 66927.156
_____
{
  "raw": "010000001001010010000000001100110100100001",
  "rh": 59.4, "temp": 20.5 }
{ "free": 1860, "usage": 440, "total": 2300, "history": 202,
  "gc": 0, "gctime": 1.962 }
start: Date: Thu Jan 1 1970 00:01:11 GMT+0000 end: Date: Thu Jan 1 1970 00:01:11 GMT+0000 elapsed: 71928.198
_____
{
  "raw": "010000001001010100000000001100110100100011",
  "rh": 59.6, "temp": 20.5 }
{ "free": 1856, "usage": 444, "total": 2300, "history": 202,
  "gc": 0, "gctime": 1.963 }
start: Date: Thu Jan 1 1970 00:01:16 GMT+0000 end: Date: Thu Jan 1 1970 00:01:16 GMT+0000 elapsed: 76928.198
_____
{
  "raw": "010000001001010010000000001100110100100001",
  "rh": 59.4, "temp": 20.5 }
{ "free": 1853, "usage": 447, "total": 2300, "history": 202,
  "gc": 0, "gctime": 1.964 }
start: Date: Thu Jan 1 1970 00:01:21 GMT+0000 end: Date: Thu Jan 1 1970 00:01:21 GMT+0000 elapsed: 81928.796
_____
{
  "raw": "010000001001010010000000001100110100100001",
  "rh": 59.4, "temp": 20.5 }
{ "free": 1849, "usage": 451, "total": 2300, "history": 202,
  "gc": 0, "gctime": 1.965 }
start: Date: Thu Jan 1 1970 00:01:26 GMT+0000 end: Date: Thu Jan 1 1970 00:01:26 GMT+0000 elapsed: 86928.826
_____
{
  "raw": "010000001001010011000000001100110100100010",
  "rh": 59.5, "temp": 20.5 }
{ "free": 1846, "usage": 454, "total": 2300, "history": 202,
  "gc": 0, "gctime": 1.966 }
start: Date: Thu Jan 1 1970 00:01:31 GMT+0000 end: Date: Thu Jan 1 1970 00:01:31 GMT+0000 elapsed: 91927.032
_____
{
  "raw": "010000001001001110000000001100111000011110",
  "rh": 59, "temp": 20.6 }
{ "free": 1842, "usage": 458, "total": 2300, "history": 202,
  "gc": 0, "gctime": 1.964 }
start: Date: Thu Jan 1 1970 00:01:36 GMT+0000 end: Date: Thu Jan 1 1970 00:01:36 GMT+0000 elapsed: 96928.07
_____

---

Posted at 2019-08-14 by Linyx

If set >5 sec - return -1 rh.
But if you call the read function two times at once, then the correct true value is returned.

How to fix this?..

---

Posted at 2019-08-14 by maze1980

Try to add trace to your program, and stop it after 3 runs. trace would print the inner state, and provide some information an what's wrong. I'd guess the module would not clean up everything.
If using line 1 doesn't give any hints try line 2, and finally line 3.

console.log(global["\xFF"].timers); //print only timers, short info
trace(global["\xFF"].timers); //print only timers, full info
trace(); //prints full info

---

Posted at 2019-08-14 by Linyx

use console.log(global["\xFF"].timers);

I see nothing wrong

Log:

 ____                 _
|  __|___ ___ ___ _ _|_|___ ___
|  __|_ -| . |  _| | | |   | . |
|____|___|  _|_| |___|_|_|_|___|
         |_| espruino.com
 2v04 (c) 2019 G.Williams
Espruino is Open Source. Our work is supported
only by sales of official boards and donations:
http://espruino.com/Donate
>
{ "err": true, "checksumError": true,
  "raw": "10000001001000000000000001101000000010010",
  "temp": -1, "rh": -1 }
{ "free": 1962, "usage": 338, "total": 2300, "history": 120,
  "gc": 0, "gctime": 1.998 }
[
  undefined,
  { "time": 4441824, "interval": 5000000,
    "callback": function () {
  this.dht.read((response) => {
      console.log(response)
      console.log(process.memory())
      console.log(global["\xFF"].timers);
      console.log('_____')
    });
}
   },
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  { "time": 11404,
    "callback": function () {a.read(c,--d)}
   },
  undefined,
  { "time": 61235,
    "callback": function () {
  a.watch&&(a.watch=clearWatch(a.watch));var e=parseInt(b.substr(2,8),2)+parseInt(b.substr(10,8),2)+parseInt(b.substr(18,8),2)+parseInt(b.substr(26,8),2);e&&(e&255)==parseInt(b.substr(34,
8),2)?c({raw:b,rh:.1*parseInt(b.substr(2,16),2),temp:.2*parseInt(b.substr(19,15),2)*(.5-b[18])}):1<d?setTimeout(function(){a.read(c,--d)},500):c({err:!0,checksumError:0<e,raw:b,temp:-1,rh:-1})
}
   }
 ]
_____
{
  "raw": "010000010001111110000000011010000000100011",
  "rh": 115, "temp": 41.6 }
{ "free": 1942, "usage": 358, "total": 2300, "history": 120,
  "gc": 0, "gctime": 2.015 }
[
  undefined,
  { "time": 4315877, "interval": 5000000,
    "callback": function () {
  this.dht.read((response) => {
      console.log(response)
      console.log(process.memory())
      console.log(global["\xFF"].timers);
      console.log('_____')
    });
}
   },
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  { "time": 2925,
    "callback": function () {
  a.watch&&(a.watch=clearWatch(a.watch));var e=parseInt(b.substr(2,8),2)+parseInt(b.substr(10,8),2)+parseInt(b.substr(18,8),2)+parseInt(b.substr(26,8),2);e&&(e&255)==parseInt(b.substr(34,
8),2)?c({raw:b,rh:.1*parseInt(b.substr(2,16),2),temp:.2*parseInt(b.substr(19,15),2)*(.5-b[18])}):1<d?setTimeout(function(){a.read(c,--d)},500):c({err:!0,checksumError:0<e,raw:b,temp:-1,rh:-1})
}
   },
  undefined,
  undefined,
  { "time": 508484,
    "callback": function () {a.read(c,--d)}
   }
 ]
_____
{
  "raw": "010000001001000001000000001101000000010011",
  "rh": 57.7, "temp": 20.8 }
{ "free": 1954, "usage": 346, "total": 2300, "history": 120,
  "gc": 0, "gctime": 1.995 }
[
  undefined,
  { "time": 3636446, "interval": 5000000,
    "callback": function () {
  this.dht.read((response) => {
      console.log(response)
      console.log(process.memory())
      console.log(global["\xFF"].timers);
      console.log('_____')
    });
}
   },
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
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  undefined,
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  undefined,
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  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  undefined,
  { "time": 42163,
    "callback": function () {
  a.watch&&(a.watch=clearWatch(a.watch));var e=parseInt(b.substr(2,8),2)+parseInt(b.substr(10,8),2)+parseInt(b.substr(18,8),2)+parseInt(b.substr(26,8),2);e&&(e&255)==parseInt(b.substr(34,
8),2)?c({raw:b,rh:.1*parseInt(b.substr(2,16),2),temp:.2*parseInt(b.substr(19,15),2)*(.5-b[18])}):1<d?setTimeout(function(){a.read(c,--d)},500):c({err:!0,checksumError:0<e,raw:b,temp:-1,rh:-1})
}
   }
 ]
_____

---

Posted at 2019-08-14 by AkosLukacs

Something is not right, start and end is the same after the second call, and elapsed is continuously increasing. Might be some watch / timeout stuck somewhere, the DHT22 library sets timeouts in multiple places...
Try to run reset(1), remove power from the board, and run again with 10000 timeout.

---

Posted at 2019-08-14 by Linyx

memory is ok. but rh and temp -1. why?..

 ____                 _
|  __|___ ___ ___ _ _|_|___ ___
|  __|_ -| . |  _| | | |   | . |
|____|___|  _|_| |___|_|_|_|___|
         |_| espruino.com
 2v04 (c) 2019 G.Williams
Espruino is Open Source. Our work is supported
only by sales of official boards and donations:
http://espruino.com/Donate
>
{ "err": true, "checksumError": true,
  "raw": "10000001001010011000000001100100000011101",
  "temp": -1, "rh": -1 }
{ "free": 1981, "usage": 319, "total": 2300, "history": 126,
  "gc": 0, "gctime": 1.969 }
start: Date: Thu Jan 1 1970 00:00:15 GMT+0000 end: Date: Thu Jan 1 1970 00:00:21 GMT+0000 elapsed: 5565.295
_____
{ "err": true, "checksumError": true,
  "raw": "10000001001011011000000001100100000100101",
  "temp": -1, "rh": -1 }
{ "free": 1981, "usage": 319, "total": 2300, "history": 126,
  "gc": 0, "gctime": 1.952 }
start: Date: Thu Jan 1 1970 00:00:25 GMT+0000 end: Date: Thu Jan 1 1970 00:00:31 GMT+0000 elapsed: 5564.528
_____
{ "err": true, "checksumError": true,
  "raw": "10000001001010110000000001100100000100000",
  "temp": -1, "rh": -1 }
{ "free": 1981, "usage": 319, "total": 2300, "history": 126,
  "gc": 0, "gctime": 1.949 }
start: Date: Thu Jan 1 1970 00:00:35 GMT+0000 end: Date: Thu Jan 1 1970 00:00:41 GMT+0000 elapsed: 5549.423
_____
{ "err": true, "checksumError": true,
  "raw": "10000001001010100000000001100100000011110",
  "temp": -1, "rh": -1 }
{ "free": 1981, "usage": 319, "total": 2300, "history": 126,
  "gc": 0, "gctime": 1.953 }
start: Date: Thu Jan 1 1970 00:00:45 GMT+0000 end: Date: Thu Jan 1 1970 00:00:51 GMT+0000 elapsed: 5564.674
_____
{ "err": true, "checksumError": true,
  "raw": "10000001001010011000000001100100100011110",
  "temp": -1, "rh": -1 }
{ "free": 1972, "usage": 328, "total": 2300, "history": 126,
  "gc": 0, "gctime": 1.967 }
start: Date: Thu Jan 1 1970 00:00:55 GMT+0000 end: Date: Thu Jan 1 1970 00:01:01 GMT+0000 elapsed: 5570.317
_____
{ "err": true, "checksumError": true,
  "raw": "10000001001010010000000001100100100011101",
  "temp": -1, "rh": -1 }
{ "free": 1972, "usage": 328, "total": 2300, "history": 126,
  "gc": 0, "gctime": 1.97 }
start: Date: Thu Jan 1 1970 00:01:05 GMT+0000 end: Date: Thu Jan 1 1970 00:01:11 GMT+0000 elapsed: 5568.358
_____
{ "err": true, "checksumError": true,
  "raw": "10000001001010000000000001100100100011011",
  "temp": -1, "rh": -1 }
{ "free": 1972, "usage": 328, "total": 2300, "history": 126,
  "gc": 0, "gctime": 1.964 }
start: Date: Thu Jan 1 1970 00:01:15 GMT+0000 end: Date: Thu Jan 1 1970 00:01:21 GMT+0000 elapsed: 5565.552
_____
{ "err": true, "checksumError": true,
  "raw": "10000001001001110000000001100100100011001",
  "temp": -1, "rh": -1 }
{ "free": 1972, "usage": 328, "total": 2300, "history": 126,
  "gc": 0, "gctime": 1.963 }
start: Date: Thu Jan 1 1970 00:01:25 GMT+0000 end: Date: Thu Jan 1 1970 00:01:31 GMT+0000 elapsed: 5576.903
_____
{ "err": true, "checksumError": true,
  "raw": "10000001001001100000000001100100100010111",
  "temp": -1, "rh": -1 }
{ "free": 1972, "usage": 328, "total": 2300, "history": 126,
  "gc": 0, "gctime": 1.963 }
start: Date: Thu Jan 1 1970 00:01:35 GMT+0000 end: Date: Thu Jan 1 1970 00:01:41 GMT+0000 elapsed: 5576.975
_____

---

Posted at 2019-08-15 by AkosLukacs

Do you have a pullup resistor (4k7 - 10k) between the data and VCC?
IIRC without an external resistor, it didn't work properly with the ESP32, I think it's internal pullup resistor is not strong enough.

---

Posted at 2019-08-16 by AkosLukacs

Ok, did some testing, and can confirm @Linyx's findings with the DHT22:

• MDBT42Q module (2v04) - works flawlessly
• ESP8266 - I have one that's been running for months without issue
• ESP32 (tested with 2v01 and 2v04) - doesn't work.

Checked the communication with a logic analyzer, and the DHT22 sends the right response (temperature and humidity valid, checksum ok). It's just the ESP32 can't pick up the response properly.

Anybody any idea?

---

Posted at 2019-08-16 by JumJum

Hmm, can't test this by myself (no DHT22).

• could you test with a not minified module ?
• could you add console.log(process.memory().free) to setWatch to see wether it happens there ?
• next possible point could be one of the setTimeout

---

Posted at 2019-08-16 by Linyx

This log if call read every 10 secs, setWatch not work:

 ____                 _
|  __|___ ___ ___ _ _|_|___ ___
|  __|_ -| . |  _| | | |   | . |
|____|___|  _|_| |___|_|_|_|___|
         |_| espruino.com
 2v04 (c) 2019 G.Williams
Espruino is Open Source. Our work is supported
only by sales of official boards and donations:
http://espruino.com/Donate
>
{ "err": true, "checksumError": false,
  "raw": "",
  "temp": -1, "rh": -1 }
{ "free": 2028, "usage": 272, "total": 2300, "history": 141,
  "gc": 0, "gctime": 1.905 }
_____
{ "err": true, "checksumError": false,
  "raw": "",
  "temp": -1, "rh": -1 }
{ "free": 2028, "usage": 272, "total": 2300, "history": 141,
  "gc": 0, "gctime": 1.887 }
_____
{ "err": true, "checksumError": false,
  "raw": "",
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> 

[espruino-discuss3]

Posted at 2019-08-16 by Linyx

this log when call
this.dht.read(function (a) {});
this.dht.read(function (a) {});

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  "gc": 0, "gctime": 1.963 }
0000000000000000000000010000000000000000000000000000000000000000000000000000000001101111111111111111111111111111111111
{ "free": 1932, "usage": 368, "total": 2300, "history": 114,
  "gc": 0, "gctime": 1.946 }
000000000000000000000000000000000000000000000000000001101111111111111111111111111111111111
{ "free": 1932, "usage": 368, "total": 2300, "history": 114,
  "gc": 0, "gctime": 1.975 }
00000000000000000000000001101111111111111111111111111111111111
{ "free": 1932, "usage": 368, "total": 2300, "history": 114,
  "gc": 0, "gctime": 1.963 }
00000000000000000000000100000000000000000000000000000000000000000000000000000000011011111111111111111111111111111111111
{ "free": 1931, "usage": 369, "total": 2300, "history": 114,
  "gc": 0, "gctime": 1.948 }
0000000000000000000000000000000000000000000000000000011011111111111111111111111111111111111
{ "free": 1931, "usage": 369, "total": 2300, "history": 114,
  "gc": 0, "gctime": 1.963 }
000000000000000000000000011011111111111111111111111111111111111
{ "free": 1931, "usage": 369, "total": 2300, "history": 114,
  "gc": 0, "gctime": 1.963 }
000000000000000000000001000000000000000000000000000000000000000000000000000000000110111111111111111111111111111111111111
{ "free": 1931, "usage": 369, "total": 2300, "history": 114,
  "gc": 0, "gctime": 1.947 }
00000000000000000000000000000000000000000000000000000110111111111111111111111111111111111111
{ "free": 1931, "usage": 369, "total": 2300, "history": 114,
  "gc": 0, "gctime": 1.975 }
0000000000000000000000000110111111111111111111111111111111111111
{ "free": 1931, "usage": 369, "total": 2300, "history": 114,
  "gc": 0, "gctime": 1.947 }
0000000000000000000000010000000000000000000000000000000000000000000000000000000001101111111111111111111111111111111111111
{ "free": 1931, "usage": 369, "total": 2300, "history": 114,
  "gc": 0, "gctime": 1.963 }
000000000000000000000000000000000000000000000000000001101111111111111111111111111111111111111
{ "free": 1931, "usage": 369, "total": 2300, "history": 114,
  "gc": 0, "gctime": 1.963 }
00000000000000000000000001101111111111111111111111111111111111111
{ "free": 1931, "usage": 369, "total": 2300, "history": 114,
  "gc": 0, "gctime": 1.948 }
00000000000000000000000100000000000000000000000000000000000000000000000000000000011011111111111111111111111111111111111111
{ "free": 1931, "usage": 369, "total": 2300, "history": 114,
  "gc": 0, "gctime": 1.963 }
0000000000000000000000000000000000000000000000000000011011111111111111111111111111111111111111
{ "free": 1931, "usage": 369, "total": 2300, "history": 114,
  "gc": 0, "gctime": 2.276 }
000000000000000000000000011011111111111111111111111111111111111111
{ "free": 1931, "usage": 369, "total": 2300, "history": 114,
  "gc": 0, "gctime": 1.946 }
000000000000000000000001000000000000000000000000000000000000000000000000000000000110111111111111111111111111111111111111111
{ "free": 1931, "usage": 369, "total": 2300, "history": 114,
  "gc": 0, "gctime": 1.947 }
00000000000000000000000000000000000000000000000000000110111111111111111111111111111111111111111
{ "free": 1930, "usage": 370, "total": 2300, "history": 114,
  "gc": 0, "gctime": 1.963 }
0000000000000000000000000110111111111111111111111111111111111111111
{ "free": 1930, "usage": 370, "total": 2300, "history": 114,
  "gc": 0, "gctime": 1.963 }
0000000000000000000000010000000000000000000000000000000000000000000000000000000001101111111111111111111111111111111111111111
{ "free": 1930, "usage": 370, "total": 2300, "history": 114,
  "gc": 0, "gctime": 1.963 }
000000000000000000000000000000000000000000000000000001101111111111111111111111111111111111111111
{ "free": 1930, "usage": 370, "total": 2300, "history": 114,
  "gc": 0, "gctime": 2.58 }
00000000000000000000000001101111111111111111111111111111111111111111
{ "free": 1930, "usage": 370, "total": 2300, "history": 114,
  "gc": 0, "gctime": 1.958 }
00000000000000000000000100000000000000000000000000000000000000000000000000000000011011111111111111111111111111111111111111111
{ "free": 1930, "usage": 370, "total": 2300, "history": 114,
  "gc": 0, "gctime": 1.947 }
0000000000000000000000000000000000000000000000000000011011111111111111111111111111111111111111111
{ "free": 1930, "usage": 370, "total": 2300, "history": 114,
  "gc": 0, "gctime": 1.963 }
000000000000000000000000011011111111111111111111111111111111111111111
{ "free": 1930, "usage": 370, "total": 2300, "history": 114,
  "gc": 0, "gctime": 1.964 }
000000000000000000000001000000000000000000000000000000000000000000000000000000000110111111111111111111111111111111111111111111
{ "free": 1930, "usage": 370, "total": 2300, "history": 114,
  "gc": 0, "gctime": 1.948 }
00000000000000000000000000000000000000000000000000000110111111111111111111111111111111111111111111
{ "free": 1930, "usage": 370, "total": 2300, "history": 114,
  "gc": 0, "gctime": 1.963 }
0000000000000000000000000110111111111111111111111111111111111111111111
{ "free": 1930, "usage": 370, "total": 2300, "history": 114,
  "gc": 0, "gctime": 2.202 }
0000000000000000000000010000000000000000000000000000000000000000000000000000000001101111111111111111111111111111111111111111111
{ "free": 1930, "usage": 370, "total": 2300, "history": 114,
  "gc": 0, "gctime": 1.964 }
000000000000000000000000000000000000000000000000000001101111111111111111111111111111111111111111111
{ "free": 1930, "usage": 370, "total": 2300, "history": 114,
  "gc": 0, "gctime": 1.963 }
00000000000000000000000001101111111111111111111111111111111111111111111
{ "free": 1929, "usage": 371, "total": 2300, "history": 114,
  "gc": 0, "gctime": 1.963 }
00000000000000000000000100000000000000000000000000000000000000000000000000000000011011111111111111111111111111111111111111111111
{ "free": 1929, "usage": 371, "total": 2300, "history": 114,
  "gc": 0, "gctime": 1.966 }
0000000000000000000000000000000000000000000000000000011011111111111111111111111111111111111111111111
{ "free": 1929, "usage": 371, "total": 2300, "history": 114,
  "gc": 0, "gctime": 1.965 }
000000000000000000000000011011111111111111111111111111111111111111111111
{ "free": 1929, "usage": 371, "total": 2300, "history": 114,
  "gc": 0, "gctime": 1.975 }
000000000000000000000001000000000000000000000000000000000000000000000000000000000110111111111111111111111111111111111111111111111
{ "free": 1929, "usage": 371, "total": 2300, "history": 114,
  "gc": 0, "gctime": 1.963 }
00000000000000000000000000000000000000000000000000000110111111111111111111111111111111111111111111111
{ "free": 1929, "usage": 371, "total": 2300, "history": 114,
  "gc": 0, "gctime": 1.964 }
0000000000000000000000000110111111111111111111111111111111111111111111111
{ "free": 1929, "usage": 371, "total": 2300, "history": 114,
  "gc": 0, "gctime": 1.963 }
0000000000000000000000010000000000000000000000000000000000000000000000000000000001101111111111111111111111111111111111111111111111
{ "free": 1929, "usage": 371, "total": 2300, "history": 114,
  "gc": 0, "gctime": 1.965 }
000

---

Posted at 2019-08-16 by Linyx

d length >600 symbols and memory low

---

Posted at 2019-08-16 by JumJum

Could you add ESP32.getState, to see how heap goes

---

Posted at 2019-08-16 by Linyx

all time

{
  "sdkVersion": "v3.1.3-dirty",
  "freeHeap": 35712, "BLE": true, "Wifi": true, "minHeap": 33112 }

---

Posted at 2019-08-16 by JumJum

So, heap runs fine.
I'm pretty sure, disabling BLE or Wifi doesn't change anything, true ?

---

Posted at 2019-08-16 by Linyx

anyway -1 rh...

---

Posted at 2019-08-16 by @MaBecker

Issue espruino/Espruino#1687 was created by ApocalypseLinyx

---

Posted at 2019-08-21 by Frida

Ok, time to bring the toys back.
With this test I have set a LED to pin, active low.

First test.

function tt () {
  ht = {};
  //ht.pin = D0; // esp8266
  ht.pin = D12; // esp32 pico4

  setInterval (function () {
    var d = "";
    ta = getTime ();
    tb = 0;

    pinMode (ht.pin, 'opendrain');

    ht.watch = setWatch (function (t) {
      d = 0 + | (t.time-t.lastTime> 0.000050); // 50 usec (time in sec)
    }, ht.pin, {edge: 'falling', repeat: true});

    //pinMode(ht.pin, 'opendrain');

    setTimeout (function () {
      pinMode (ht.pin, 'input_pullup');
      tb = getTime ();
      console.log (tb-ta);
    }, 1000);

    setTimeout (function () {
      Clear watch (ht.watch);
      console.log ('d =' + d);
      console.log (process.memory ());
    }, 200);


  }, 3000);
}

TT ();

 
It only gives me short pulses, and not for 1 second, as expected.
If I remove clearWatch (ht.watch), I get a short pulse, then full pulse length and it uses all the memory.

On esp8266 there are no problems.

Next test.

function tt () {
  ht = {};
  //ht.pin = D0; // esp8266
  ht.pin = D12; // esp32 pico4

  setInterval (function () {
    var d = "";
    ta = getTime ();
    tb = 0;

    //pinMode(ht.pin, 'opendrain');

    ht.watch = setWatch (function (t) {
      d = 0 + | (t.time-t.lastTime> 0.000050); // 50 usec (time in sec)
    }, ht.pin, {edge: 'falling', repeat: true});

    pinMode (ht.pin, 'opendrain');

    setTimeout (function () {
      pinMode (ht.pin, 'input_pullup');
      tb = getTime ();
      console.log (tb-ta);
    }, 1000);

    setTimeout (function () {
      Clear watch (ht.watch);
      console.log ('d =' + d);
      console.log (process.memory ());
    }, 200);


  }, 3000);
}

TT ();

Here pinMode has been moved to after set_Watch and I can determine pulse length on LED.
Also works on esp8266.

And now for a workaround, so it works on both esp8266 and esp32 pico4 as I have.

Hope this is something you can use?

// testWatch02

function DHT22 (pin) {
  this.pin = pin;
}

DHT22.prototype.read = function (cb, n) {
  if (! n) n = 10;
  var d = "";
  var ht = this;

  // start watching for state change
  ht.watch = setWatch (function (t) {
    d = 0 + | (t.time-t.lastTime> 0.00005);
  }, ht.pin, {edge: 'falling', repeat: true});

  pinMode (ht.pin, 'opendrain'); // PB obs It sets the output low immediately

  // raise pulse after 10ms
  setTimeout (function () {pinMode (ht.pin, 'input_pullup'); pinMode (ht.pin);}, 10);

  // stop looking after 100ms
  setTimeout (function () {
    if (ht.watch) {ht.watch = clearWatch (ht.watch); }

d = d.substr (1); // PB you are a genius
    var cks =
        parseInt (d.substr (2.8) 2) +
        parseInt (d.substr (10.8), 2) +
        parseInt (d.substr (18.8), 2) +
        parseInt (d.substr (26.8), 2);
    if (cks && (((cks & 0xFF) == parseInt (d.substr (34.8), 2))) {
      cb ({
        raw: d,
        rh: parseInt (d.substr (2.16), 2) * 0.1,
        temp: parseInt (d.substr. (19.15), 2) * 0.2 * (0.5-d [18])
      });
    } else {
      if (n> 1) setTimeout (function () {ht.read (cb, - n);}, 500);
      // else cb ({err: true, checksumError: cks> 0, raw: d, temp: -1, rh: -1});
      else cb ({err: true, checksumError: cks> 0, raw: d, temp: -1, rh: -1, n: n});
    }
  }, 100);
};

DHT22.prototype.getName = function () {
return 'Frida';
};
/ *
exports.connect = function (pin) {
    return new DHT22 (pin);
};
* /


function dd () {
  esp = 0;
  if (esp) {
    pin = D0; // esp8266
    // esp8266 version 2v00.68 (c) 2018 G.Williams
    var ESP8266 = require ('ESP8266');
    ESP8266.setCPUFreq (80);
    console.log (ESP8266.getState ());
  } else {
    pin = D12; // esp32 pico4
    // esp32 pico4 version 2v02 (c) 2018 G.Williams
    console.log (ESP32.getState ());
  }

// var dht = require ("DHT22a"). connect (pin);
  var dht = new DHT22 (pin);

  console.log (dht.getName ());

  setInterval (function () {

    dht.read (function (a) {
      console.log ("Temp is" + a.temp.toFixed (1) .toString () +
                  ", RH is" + a.rh.toFixed (1) .toString () +
                  "\ Nraw:" + a.raw +
                  "\ nn:" + a.n +
                  "\ Nerr:" + a.err +
                  ", cse:" + a.checksumError);},
             1);

    setTimeout (function () {
      console.log ("E-Flags: [" + E.getErrorFlags () + "] \ n \ n");},
               1000);

  }, 3000);

}


dd ();

// save ();

And some outputs.

Temp is 35.1, RH is 92.3
raw:010000001110011011000000010101111111111110
n: undefined
err:undefined, cse:undefined
E-Flags: []
Temp is 35.1, RH is 92.4
raw:010000001110011100000000010101111111111111
n: undefined
err:undefined, cse:undefined
E-Flags: []
Temp is 35.1, RH is 92.5
raw:010000001110011101000000010101111100000000
n: undefined
err:undefined, cse:undefined
E-Flags: []
Temp is 35.1, RH is 92.6
raw:010000001110011110000000010101111100000001
n: undefined
err:undefined, cse:undefined
E-Flags: []
Temp is 35.1, RH is 92.7
raw:010000001110011111000000010101111100000010
n: undefined
err:undefined, cse:undefined
E-Flags: []
Temp is 35.1, RH is 92.8
raw:010000001110100000000000010101111100000011
n: undefined
err:undefined, cse:undefined
E-Flags: []
Temp is 35.1, RH is 92.9
raw:010000001110100001000000010101111100000100
n: undefined
err:undefined, cse:undefined
E-Flags: []
Temp is 35.1, RH is 93.0
raw:010000001110100010000000010101111100000101
n: undefined
err:undefined, cse:undefined
E-Flags: []
Temp is 35.1, RH is 93.1
raw:010000001110100011000000010101111100000110
n: undefined
err:undefined, cse:undefined
E-Flags: []
Temp is 35.1, RH is 93.2
raw:010000001110100100000000010101111100000111
n: undefined
err:undefined, cse:undefined
E-Flags: []

Happy coding.

---

Posted at 2019-08-22 by maze1980

What changed from #1 (good temperature readings) to #8 (checksum error)? The length of the raw output changed by one bit. What did you change?

The code in #20 looks non-functional, e.g. parseInt (d.substr (2.8) 2) + can't work.

I copied in the module as reference, with some notes:

/* Copyright (C) 2014 Spence Konde. See the file LICENSE for copying permission. */
/*
This module interfaces with a DHT22 temperature and relative humidity sensor.
Usage (any GPIO pin can be used):

var dht = require("DHT22").connect(C11);
dht.read(function (a) {console.log("Temp is "+a.temp.toString()+" and RH is "+a.rh.toString());});

the return value if no data received: {"temp": -1, "rh": -1, err:true, "checksumError": false}
the return value, if some data is received, but the checksum is invalid: {"temp": -1, "rh": -1, err:true, "checksumError": true}
  */

function DHT22(pin) {
  this.pin = pin;
}

DHT22.prototype.read = function (cb, n) {
  if (!n) n=10;
  var d = "";
  var ht = this;
  digitalWrite(ht.pin, 0);
  pinMode(ht.pin,"output"); // force pin state to output
  // start watching for state change
  this.watch = setWatch(function(t) {
    d+=0|(t.time-t.lastTime>0.00005);
  }, ht.pin, {edge:'falling',repeat:true} );
  // raise pulse after 1ms
  setTimeout(function() {pinMode(ht.pin,'input_pullup');pinMode(ht.pin);},1);
  // stop looking after 50ms
  setTimeout(function() {
    if(ht.watch){ ht.watch = clearWatch(ht.watch); }
    var cks =
        parseInt(d.substr(2,8),2)+
        parseInt(d.substr(10,8),2)+
        parseInt(d.substr(18,8),2)+
        parseInt(d.substr(26,8),2);
    if (cks&&((cks&0xFF)==parseInt(d.substr(34,8),2))) {
      cb({
        raw : d,
        rh : parseInt(d.substr(2,16),2)*0.1,
        temp : parseInt(d.substr(19,15),2)*0.2*(0.5-d[18])
      });
    } else {
      if (n>1) setTimeout(function() {ht.read(cb,--n);},500);
      else cb({err:true, checksumError:cks>0, raw:d, temp:-1, rh:-1});
    }
  }, 50);
};

exports.connect = function(pin) {
    return new DHT22(pin);
};

From my point of view line 22 is not necessary, or if it is lines 21 and 22 should be swapped.
Line 23 could read // read d based on signal change interval

Lines 27 and 28 could be moved to the end and then rewritten. Since the lines will be only executed once everything is set up there's no need to use a setTimer in this case:

//trigger data transmission
pinMode(ht.pin,'input_pullup');
pinMode(ht.pin);

Line 29 could read // parse the received data d (50ms length)
Line 31 could be changed to clearWatch(ht.watch);, using if is not necessary.
And I'd change line 1 to if (!n) n=1; because one try should be enough if nothing else was specified.

And if your raw data is too long, capturing also the trigger you can add d = d.substr (1); //remove trigger signal to the code. I don't have this sensor, so I can't try.