0.3.1 SHT2x

Author: RobTillaart

libraries/SHT2x/CHANGELOG.md

@@ -6,6 +6,16 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
 
+## [0.3.1] - 2023-09-10
+- fix #21 example for elaborated async.
+- improve async interface
+  - add **getRequestType()** to async interface
+  - add three request constants to .h file
+  - add **bool requestReady()** checks both.
+- update readme.md
+- minor edits
+
+
 ## [0.3.0] - 2023-03-26
 - fix setResolution #13, #18
 - fix heater settings
@@ -41,16 +51,16 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Fix getEIDB() bug.
 
 ## [0.1.3] - 2021-12-28
-- update library.json 
+- update library.json
 - update license
 - minor edits
 
-## [0.1.2] - 2021-09-29  
+## [0.1.2] - 2021-09-29
 - Add Si70xx derived classes
 - add getEIDA(), getEIDB(), getFirmwareVersion()
 - update build-CI, readme.md badges
 
-## [0.1.1] - 2021-09-28  
+## [0.1.1] - 2021-09-28
 - Add HTU2x derived classes,
 - update readme.md + add some status info
 

libraries/SHT2x/README.md

@@ -1,9 +1,12 @@
 
-[![Arduino CI](https://github.com/robtillaart/SHT2x/workflows/Arduino%20CI/badge.svg)](https://github.com/marketplace/actions/arduino_ci)
-[![JSON check](https://github.com/RobTillaart/SHT2x/actions/workflows/jsoncheck.yml/badge.svg)](https://github.com/RobTillaart/SHT2x/actions/workflows/jsoncheck.yml)
+[![Arduino CI](https://github.com/RobTillaart/SHT2x/workflows/Arduino%20CI/badge.svg)](https://github.com/marketplace/actions/arduino_ci)
 [![Arduino-lint](https://github.com/RobTillaart/SHT2x/actions/workflows/arduino-lint.yml/badge.svg)](https://github.com/RobTillaart/SHT2x/actions/workflows/arduino-lint.yml)
+[![JSON check](https://github.com/RobTillaart/SHT2x/actions/workflows/jsoncheck.yml/badge.svg)](https://github.com/RobTillaart/SHT2x/actions/workflows/jsoncheck.yml)
+[![GitHub issues](https://img.shields.io/github/issues/RobTillaart/SHT2x.svg)](https://github.com/RobTillaart/SHT2x/issues)
+
 [![License: MIT](https://img.shields.io/badge/license-MIT-green.svg)](https://github.com/RobTillaart/SHT2x/blob/master/LICENSE)
 [![GitHub release](https://img.shields.io/github/release/RobTillaart/SHT2x.svg?maxAge=3600)](https://github.com/RobTillaart/SHT2x/releases)
+[![PlatformIO Registry](https://badges.registry.platformio.org/packages/robtillaart/library/SHT2x.svg)](https://registry.platformio.org/libraries/robtillaart/SHT2x)
 
 
 # SHT2x
@@ -39,6 +42,13 @@ If you want to use more on one I2C bus one needs either an I2C multiplexer
 or one should switch sensors on/off like the select in SPI communication.
 
 
+#### Related
+
+- https://github.com/RobTillaart/SHT31
+- https://github.com/RobTillaart/SHT85
+- https://github.com/RobTillaart/tinySHT2x
+
+
 ## Interface
 
 ```cpp
@@ -89,13 +99,24 @@ Note: The raw temperature and raw humidity are ideal to minimize storage or to m
 Experimental since 0.2.2 this interface can change in the future
 Discussion see https://github.com/RobTillaart/SHT2x/issues/16
 
-- **bool requestTemperature()**
-- **bool requestHumidity()**
-- **bool reqTempReady()**
-- **bool reqHumReady()**
-- **bool readTemperature()**
-- **bool readHumidity()**
-- **uint32_t lastRequest()**
+- **bool requestTemperature()** starts new temperature request.
+Overrules optional existing / running request.
+- **bool requestHumidity()** starts new humidity request.
+Overrules optional existing / running request.
+- **bool reqTempReady()** returns true if temperature request is ready.
+- **bool reqHumReady()** returns true if humidity request is ready.
+- **bool requestReady()** checks if either temperature or humidity is ready.
+- **bool readTemperature()** calculates the temperature from raw measurement.
+- **bool readHumidity()** calculates the humidity from raw measurement.
+- **uint32_t lastRequest()** timestamp of last request.
+- **uint8_t getRequestType()** get current request type.
+
+
+|  Value  | Symbolic                    |  Description                  |  Notes     |
+|:-------:|:----------------------------|:------------------------------|:-----------|
+|  0x00   |  SHT2x_REQ_NONE             |  no request pending           |            |
+|  0x01   |  SHT2x_REQ_TEMPERATURE      |  temperature request pending  |            |
+|  0x02   |  SHT2x_REQ_HUMIDITY         |  humidity request pending     |            |
 
 TODO elaborate documentation.
 
@@ -157,28 +178,28 @@ To be tested.
 
 #### Status fields
 
-From HTU20 datasheet
+From HTU20 datasheet (read for details).
 
-|  bits  | value  | meaning             |
-|:------:|:------:|:--------------------|
-|  00    |   0    | open circuit        |
-|  01    |   1    | temperature reading |
-|  10    |   2    | humidity reading    |
-|  11    |   3    | closed circuit      |
+|  bits  |  value  |  Symbolic                     |  Description          |
+|:------:|:-------:|:------------------------------|:----------------------|
+|   00   |    0    |  SHT2x_STATUS_OPEN_CIRCUIT    |  open circuit         |
+|   01   |    1    |  SHT2x_STATUS_TEMPERATURE     |  temperature reading  |
+|   10   |    2    |  SHT2x_STATUS_HUMIDITY        |  humidity reading     |
+|   11   |    3    |  SHT2x_STATUS_CLOSED_CIRCUIT  |  closed circuit       |
 
 
 #### Resolution
 
 **Warning experimental** 
-- needs more testing as results are not in line with the datasheet.
+- needs more testing as the results are not in line with the datasheet.
 - only tested on a HTUxx sensor.
 - tested with **SHT2X_resolution.ino**
 
 - **void setResolution(uint8_t res)** res = 0..3, other values return false.
 - **uint8_t getResolution()** returns resolution set 0..3.
 
 
-Datasheet SHT20 Table 8: (resolution)
+Datasheet SHT20 Table 8: resolution
 
 |  RES  |  Humidity  |  Temperature  |
 |:-----:|:----------:|:-------------:|
@@ -187,7 +208,8 @@ Datasheet SHT20 Table 8: (resolution)
 |   2   |   10 bit   |    13 bit     |
 |   3   |   11 bit   |    11 bit     |
 
-Datasheet SHT20 Table 7: (timing) and results of real measurements.
+
+Datasheet SHT20 Table 7: timing versus results of real measurements.
 ( https://github.com/RobTillaart/SHT2x/pull/11 )
 
 |  RES  |  HUM  |  TEMP  |  TOTAL  |  REAL  |
@@ -209,44 +231,45 @@ Timing in milliseconds.
 ## Future
 
 #### Must
+
 - improve documentation
   - reorganize interface
+  - async documentation
 - clean up code.
 
-
 #### 0.4.0
+
 - add crc8 check (need sensor to test)
 - improve error handling (all code paths)
 - investigate blocking delay() in read 
 - add offset for temperature and humidity
 
-
-#### ASYNC 0.4.0
-improvements for interface.
-
-- **bool requestReady()** checks both.
-- **bool requestPending()** checks.
-- **uint8_t getRequestType()** returns 0, 1, 2.
-- async documentation
-
-
 #### Should
+
 - test test test
   - get hardware
 - add examples
   - test resolutions
   - performance different resolutions
   - test battery
 
-
 #### Could
+
 - fix TODO in code (.cpp and .h) and documentation
 - update unit tests
 - add type info in derived classes?
 
-
 #### Wont
 
 - add **getSerialNumber()**
   **getEIDA()** and **getEIDB()** covers this
 
+
+## Support
+
+If you appreciate my libraries, you can support the development and maintenance.
+Improve the quality of the libraries by providing issues and Pull Requests, or
+donate through PayPal or GitHub sponsors.
+
+Thank you,
+

libraries/SHT2x/SHT2x.cpp

@@ -1,7 +1,7 @@
 //
 //    FILE: SHT2x.cpp
 //  AUTHOR: Rob Tillaart, Viktor Balint
-// VERSION: 0.3.0
+// VERSION: 0.3.1
 //    DATE: 2021-09-25
 // PURPOSE: Arduino library for the SHT2x temperature and humidity sensor
 //     URL: https://github.com/RobTillaart/SHT2x
@@ -26,10 +26,6 @@
 #define SHT2x_USRREG_BATTERY            0x20
 #define SHT2x_USRREG_HEATER             0x04
 
-#define SHT2x_REQ_NONE                  0x00
-#define SHT2x_REQ_TEMPERATURE           0x01
-#define SHT2x_REQ_HUMIDITY              0x02
-
 
 //////////////////////////////////////////////////////////////
 //
@@ -39,7 +35,7 @@ SHT2x::SHT2x()
 {
   _lastRead       = 0;
   _lastRequest    = 0;
-  _requestType    = 0;
+  _requestType    = SHT2x_REQ_NONE;
   _rawTemperature = 0;
   _rawHumidity    = 0;
   _heatTimeout    = 0;
@@ -165,6 +161,11 @@ bool SHT2x::reqHumReady()
 }
 
 
+bool SHT2x::requestReady()
+{
+  return (reqTempReady() || reqHumReady());
+}
+
 bool SHT2x::readTemperature()
 {
   uint8_t buffer[3];
@@ -177,7 +178,7 @@ bool SHT2x::readTemperature()
   if (crc8(buffer, 2) != buffer[2])
   {
     _error = SHT2x_ERR_CRC_TEMP;
-  //  return false;  // do not fail yet
+  //  return false;  //  do not fail yet
   }
   _rawTemperature  = buffer[0] << 8;
   _rawTemperature += buffer[1];
@@ -187,7 +188,7 @@ bool SHT2x::readTemperature()
   _requestType = SHT2x_REQ_NONE;
 
   _status = buffer[1] & 0x0003;
-  if (_status == 0xFF)  // TODO  != 0x01  (need HW to test)
+  if (_status == 0xFF)  //  TODO  != 0x01  (need HW to test)
   {
     _error = SHT2x_ERR_READBYTES;
     return false;
@@ -207,7 +208,7 @@ bool SHT2x::readHumidity()
   if (crc8(buffer, 2) != buffer[2])
   {
     _error = SHT2x_ERR_CRC_HUM;
-  //    return false;  // do not fail yet
+  //    return false;  //  do not fail yet
   }
   _rawHumidity  = buffer[0] << 8;
   _rawHumidity += buffer[1];
@@ -235,20 +236,26 @@ uint32_t SHT2x::lastRequest()
 }
 
 
+uint8_t SHT2x::getRequestType()
+{
+  return _requestType;
+}
+
+
 /////////////////////////////////////////////////////////
 //
 //  TEMPERATURE AND HUMIDTY
 //
 float SHT2x::getTemperature()
 {
-  // par 6.2
+  //  par 6.2
   return -46.85 + (175.72 / 65536.0) * _rawTemperature;
 }
 
 
 float SHT2x::getHumidity()
 {
-  // par  6.1
+  //  par 6.1
   return -6.0 + (125.0 / 65536.0) * _rawHumidity;
 }
 
@@ -347,7 +354,7 @@ bool SHT2x::heatOff()
 
   if (writeCmd(SHT2x_WRITE_USER_REGISTER, userReg) == false)
   {
-    _error = SHT2x_ERR_HEATER_OFF;  // can be serious!
+    _error = SHT2x_ERR_HEATER_OFF;  //  can be serious!
     return false;
   }
   _heaterStop = millis();
@@ -362,7 +369,7 @@ bool SHT2x::isHeaterOn()
   {
     return false;
   }
-  // did not exceed time out
+  //  did not exceed time out
   if (millis() - _heaterStart < (_heatTimeout * 1000UL))
   {
     return true;
@@ -380,7 +387,7 @@ bool SHT2x::setHeaterLevel(uint8_t level)
   }
 
   uint8_t heaterReg = 0;
-  writeCmd(0x11);  // Read Heater Control Register
+  writeCmd(0x11);  //  Read Heater Control Register
   if (readBytes(1, (uint8_t *) &heaterReg, 5) == false)
   {
     _error = SHT2x_ERR_READBYTES;
@@ -400,7 +407,7 @@ bool SHT2x::setHeaterLevel(uint8_t level)
 bool SHT2x::getHeaterLevel(uint8_t & level)
 {
   uint8_t heaterReg = 0;
-  writeCmd(0x11);  // Read Heater Control Register
+  writeCmd(0x11);  //  Read Heater Control Register
   if (readBytes(1, (uint8_t *) &heaterReg, 5) == false)
   {
     _error = SHT2x_ERR_READBYTES;
@@ -541,8 +548,8 @@ bool SHT2x::batteryOK()
 //
 uint8_t SHT2x::crc8(const uint8_t *data, uint8_t len)
 {
-  // CRC-8 formula from page 14 of SHT spec pdf
-  // Sensirion_Humidity_Sensors_SHT2x_CRC_Calculation.pdf
+  //  CRC-8 formula from page 14 of SHT spec pdf
+  //  Sensirion_Humidity_Sensors_SHT2x_CRC_Calculation.pdf
   const uint8_t POLY = 0x31;
   uint8_t crc = 0x00;