Thanks!

[espruino-discuss]

Posted at 2022-02-20 by jimr1603

After getting the bangle 2, I realised I like this event-based loop more than arduino coding style, so I took a bit of yesterday afternoon to reprogram my home environment monitors to be espurinos.

Hardware-wise 8266 + dht22 + cheap screen.

I'm on the wrong pc right now, I'll copy-paste the code I threw on them, it's about 3 tutorials sewn together.

They were sending mqtt to an internal mosquitto server, but it kept falling over and it's a pain to unplug all 3 to fix them wired in. Now the node-red box queries them with the super tiny webserver the espurino can hold. Bonus - I can reprogram them over the air, at least when I'm at the right computer.

[espruino-discuss]

Posted at 2022-02-21 by @gfwilliams

Nice - thank you! It's always nice to know when people are enjoying using it :)

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Posted at 2022-02-21 by jimr1603

I might try turning this into a full-blown tutorial for the pages, but in case that never gets started, here's the code I've copy-pasted together:

var temperature;
var humidity;

var dht = require("DHT22").connect(D2);

function onPage(req, res){
  var page = temperature + "," + humidity;
    res.writeHead(200, {'Content-Type': 'text/html'});
    res.end(page);
}

function writeScreen(){
  g.clear();
 g.drawString(temperature, 0, 0); 
  g.drawString(humidity, 0, 30);
 g.flip();
}
// I2C
I2C1.setup({scl:D5,sda:D4});
var g = require("SSD1306").connect(I2C1, writeScreen);
g.setFont("4x6", 5);

function readDHT(){
  dht.read(function(a) {
   temperature = a.temp.toString();
    humidity = a.rh.toString();
    console.log("Temp is "+a.temp.toString()+" and RH is "+a.rh.toString());
  });
  writeScreen();
}


setInterval(readDHT, 2000);

require("http").createServer(onPage).listen(80);

My node.red asks http://esp_hostname.local for the page, and parses it as csv.