add sensor test & readme
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Glyn Hudson
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# Temperature & Humidity Sensor Evaluation and Testing
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| Metric | [HTU21D](https://octopart.com/htu21d-measurement+specialties-30374934) |[Si72021](https://octopart.com/si7021-a20-im-silicon+labs-52675246)| DHT22 | DHT22 vs HTU21D Difference| [BME280](https://octopart.com/bme280-bosch-52931981) |
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| ------------- | ------------- |------------- | ------------- | ------------- | ------------- |
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| Cost in 1k off | £1.42 (July16) |£2.15| £4.57 (July16) | 3.2 times cheaper (£3.15 less!) | £3.07 |
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| Vcc | 2.1v - 3.6V | 1.9V - 3.6V | 3.3-6V | | 1.71 V - 3.6V |
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| Humidity accuracy | ±2% RH | ±2% RH | ±2%RH | n/a | ±3%RH |
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| Humidity Range | 0-100% RH | 0-100% RH | 0-100% RH | n/a| 0-100% RH |
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| Temperature accuracy | ±0.3°C | ±0.4°C| ±0.5°C | 40% more accurate | ±0.5 - ±1.0 |
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| Temperature Range | -40°C +125°C | -40°C +125°C | -40°C +80°C | 56% more accurate | -40°C +80°C |
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| Sleep Current | 0.02uA | 0.06uA | 15uA | 750 times less power | 0.1uA - 0.3uA |
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| Measurement Current | 0.045mA | 0.09 mA | 0.5mA | 11 times less power | 0.714mA - 0.350mA |
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| Measurement time | 0.01s - 0.0026s | 0.01s - 0.0026s | 2s | 200 times faster | 0.013s |
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| Energy consumed per sample | 0.00045mW || 1mW | 2222 times less power | |
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| Time sampling per day* | 14.4s || 2800s | | |
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| Time sleeping per day* | 86386s || 83600s | | |
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| Energy consumed per day* | 2.36mW [1] || 2836mW [2] | 1201 times less energy per day! | |
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## Energy consumed per day*
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- **HTU21D:** (14.4s * 0.045mA) + (86386 * 0.00002mA) = 0.63mW + 1.73mW = **2.36mW** [1]
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- **DHT22:** (2800s * 0.55mA) + (86386 * 0.015mA) = 1540mW + 1295.8mW = **2836mW** [2]
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\*Assuming 1 sample per min and sleeping in between samples, 1440 min per day = 86400s per day
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[Adafruit HTU21D Library](https://github.com/adafruit/Adafruit_HTU21DF_Library)
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.pioenvs
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# Continuous Integration (CI) is the practice, in software
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# engineering, of merging all developer working copies with a shared mainline
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# several times a day < http://docs.platformio.org/en/stable/ci/index.html >
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#
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# Documentation:
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#
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# * Travis CI Embedded Builds with PlatformIO
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# < https://docs.travis-ci.com/user/integration/platformio/ >
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#
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# * PlatformIO integration with Travis CI
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# < http://docs.platformio.org/en/stable/ci/travis.html >
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#
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# * User Guide for `platformio ci` command
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# < http://docs.platformio.org/en/stable/userguide/cmd_ci.html >
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#
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#
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# Please choice one of the following templates (proposed below) and uncomment
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# it (remove "# " before each line) or use own configuration according to the
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# Travis CI documentation (see above).
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#
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#
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# Template #1: General project. Test it using existing `platformio.ini`.
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#
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# language: python
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# python:
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# - "2.7"
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#
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# sudo: false
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# cache:
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# directories:
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# - "~/.platformio"
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#
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# install:
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# - pip install -U platformio
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#
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# script:
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# - platformio run
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#
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# Template #2: The project is intended to by used as a library with examples
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#
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# language: python
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# python:
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# - "2.7"
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#
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# sudo: false
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# cache:
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# directories:
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# - "~/.platformio"
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#
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# env:
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# - PLATFORMIO_CI_SRC=path/to/test/file.c
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# - PLATFORMIO_CI_SRC=examples/file.ino
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# - PLATFORMIO_CI_SRC=path/to/test/directory
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#
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# install:
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# - pip install -U platformio
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#
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# script:
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# - platformio ci --lib="." --board=TYPE_1 --board=TYPE_2 --board=TYPE_N
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@ -0,0 +1,38 @@
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This directory is intended for the project specific (private) libraries.
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PlatformIO will compile them to static libraries and link to executable file.
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The source code of each library should be placed in separate directory, like
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"lib/private_lib/[here are source files]".
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For example, see how can be organized `Foo` and `Bar` libraries:
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|--lib
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| |--Bar
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| | |--docs
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| | |--examples
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| | |--src
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| | |- Bar.c
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| | |- Bar.h
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| |--Foo
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| | |- Foo.c
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| | |- Foo.h
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| |- readme.txt --> THIS FILE
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|- platformio.ini
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|--src
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|- main.c
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Then in `src/main.c` you should use:
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#include <Foo.h>
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#include <Bar.h>
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// rest H/C/CPP code
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PlatformIO will find your libraries automatically, configure preprocessor's
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include paths and build them.
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See additional options for PlatformIO Library Dependency Finder `lib_*`:
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http://docs.platformio.org/en/stable/projectconf.html#lib-install
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#
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# PlatformIO Project Configuration File
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#
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# Please make sure to read documentation with examples first
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# http://docs.platformio.org/en/stable/projectconf.html
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#
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[env:uno]
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platform = atmelavr
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framework = arduino
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board = uno
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lib_install=536
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# lib 536 : https://github.com/LowPowerLab/SI7021
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#include <Wire.h>
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#include <SI7021.h>
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SI7021 sensor;
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void setup() {
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sensor.begin();
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Serial.begin(9600);
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Serial.println("Start Si7201 test");
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// this driver should work for SI7020 and SI7021, this returns 20 or 21
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int deviceid = sensor.getDeviceId();
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Serial.print("ID: "); Serial.println(deviceid);
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}
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void loop() {
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// temperature is an integer in hundredths
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float temperature = sensor.getCelsiusHundredths();
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temperature = temperature / 100.0;
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Serial.print("temp: "); Serial.println(temperature);
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// humidity is an integer representing percent
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float humidity = sensor.getHumidityPercent();
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Serial.print("humidity %: "); Serial.println(humidity);
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// enable internal heater for testing
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sensor.setHeater(true);
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delay(5000);
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sensor.setHeater(false);
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// see if heater changed temperature
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temperature = sensor.getCelsiusHundredths();
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temperature = temperature / 100.0;
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Serial.print("temp after heating: "); Serial.println(temperature);
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// get humidity and temperature in one shot, saves power because sensor takes temperature when doing humidity anyway
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si7021_env data = sensor.getHumidityAndTemperature();
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Serial.print("temp fast: "); Serial.println(data.celsiusHundredths/100.0);
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Serial.print("humidity fast: "); Serial.println(data.humidityBasisPoints/100.0);
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delay(5000);
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}
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38
src/src.ino
38
src/src.ino
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/*
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emonTH Low Power DHT22 Humidity & Temperature, DS18B20 Temperature & Pulse counting Node Example
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emonTH Low Power SI7021 / DHT22 Humidity & Temperature, DS18B20 Temperature & Pulse counting Node Example
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Checkes at startup for presence of a DS18B20 temp sensor , DHT22 (temp + humidity) or both
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If it finds both sensors the temperature value will be taken from the DS18B20 (external) and DHT22 (internal) and humidity from DHT22
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Checkes at startup for presence of a DS18B20 temp sensor , DHT22 or SI7021 (temp + humidity)
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If it finds both DHT22 or SI7021 & DS18B20 sensors the temperature value will be taken from the DS18B20 (external) and DHT22 / SI7021 (internal) and humidity from DHT22
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If it finds only DS18B20 then no humidity value will be reported
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If it finds only a DHT22 then both temperature and humidity values will be obtained from this sesor
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If it finds only a DHT22 / SI7021 then both temperature and humidity values will be obtained from this sensor
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Technical hardware documentation wiki: http://wiki.openenergymonitor.org/index.php?title=EmonTH
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THIS SKETCH REQUIRES:
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Libraries in the standard arduino libraries folder:
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- JeeLib https://github.com/jcw/jeelib
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- DHT22 Sensor Library https://github.com/adafruit/DHT-sensor-library - be sure to rename the sketch folder to remove the '-'
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- OneWire library http://www.pjrc.com/teensy/td_libs_OneWire.html
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- DallasTemperature http://download.milesburton.com/Arduino/MaximTemperature/DallasTemperature_LATEST.zip
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Libraries required:
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- see platformio.ini
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- recommend compiling with platformIO for auto library download
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- Arduno IDE can be used to compile but libs will need to be manually downloaded
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Recommended node ID allocation
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-----------------------------------------------------------------------------------------------------------
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31 - Special allocation in JeeLib RFM12 driver - Node31 can communicate with nodes on any network group
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-------------------------------------------------------------------------------------------------------------
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Change log:
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v2.1 - Branched from emonTH_DHT22_DS18B20 example, first version of pulse counting version
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v2.2 - 60s RF transmit period now uses timer1, pulse events are decoupled from RF transmit
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v2.3 - rebuilt based on low power pulse counting code by Eric Amann: http://openenergymonitor.org/emon/node/10834
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v2.4 - 5 min default transmisson time = 300 ms
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v2.3 - (12/10/14) don't flash LED on RF transmission to save power
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V2.4 - (15/10/15) activate pulse count pin input pullup to stop spurious pulses when no sensor connected
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V2.5 - (23/10/15) default nodeID 23 to enable new emonHub.conf decoder for pulseCount packet structure
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V2.6 - (24/10/15) Tweek RF transmission timmng to help reduce RF packet loss
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V2.7 - (15/09/16) Serial print serial pairs for emonesp compatiable e.g. temp:210,humidity:56
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V3.0 - (15/09/16) Add support for SI7021 sensor (emonTH V2.0 hardware)
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V3.0 - (15/09/16) Add support for SI7021 sensor (emonTH V2.0 hardware)
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V2.7 - (15/09/16) Serial print serial pairs for emonesp compatiable e.g. temp:210,humidity:56
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V2.6 - (24/10/15) Tweek RF transmission timmng to help reduce RF packet loss
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V2.5 - (23/10/15) default nodeID 23 to enable new emonHub.conf decoder for pulseCount packet structure
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V2.4 - (15/10/15) activate pulse count pin input pullup to stop spurious pulses when no sensor connected
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v2.3.1 - (12/10/14) don't flash LED on RF transmission to save power
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v2.3 - rebuilt based on low power pulse counting code by Eric Amann: http://openenergymonitor.org/emon/node/10834
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v2.2 - 60s RF transmit period now uses timer1, pulse events are decoupled from RF transmit
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v2.4 - 5 min default transmisson time = 300 ms
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v2.1 - Branched from emonTH_DHT22_DS18B20 example, first version of pulse counting version
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-------------------------------------------------------------------------------------------------------------
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emonhub.conf node decoder:
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See: https://github.com/openenergymonitor/emonhub/blob/emon-pi/configuration.md
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scales = 0.1,0.1,0.1,0.1,1
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units = C,C,%,V,p
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*/
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// -------------------------------------------------------------------------------------------------------------
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const byte version = 30; // firmware version divided by 10 e,g 16 = V1.6
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// These variables control the transmit timing of the emonTH
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