particulate-matter_ESP32_SDS011_BME280_DHT22

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particulate-matter_ESP32_SDS011_BME280_DHT22

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// repository documentation

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## Feinstaub-Sensor connected with LoRaWan by RFM95
 based on the ESP8266 version of the community Stuttgart (Open Data Stuttgart)
http://codefor.de/stuttgart/  build: http://luftdaten.info/feinstaubsensor-bauen/

### used hardware
* microcontroller:	ESP32   DOIT or WEMOS LoLin-V1.0.0
* Feinstaubsensor:	SDS011		http://inovafitness.com/en/Laser-PM2-5-Sensor-SDS011-35.html
* Temp/Hum:			DHT22 (no resistor between Vcc & Data when powered by 3.3V!)
* Temp/Hum/Press:	BME280
* LoRa Module:		RFM95 on breadboard
* Battery			Power Pack (10000mAh)

### power supply
* powered via USB: 5V, Vin on board connected to SDS011

### power measurement
running:  110 - 130mA
waiting:   70mA  (no sleep mode implemented)

### authentication
* both authentication methods are available (only for DOIT).
  you have to configure the device via the console in the desired method
 > Over-the-Air Activation (OTAA)
 
 > Activation by Personalization (ABP)

### remarks
* please read carefully the changes made in lmic/config.h
* and the compiling selections made for the board
* you need to install ESP32 in the Arduino IDE (link in code)
* Keys for ABP were separeted, structure explained
* the values from DHT22 will be overwritten if both sensors are selected (see remarks in the code)
* verify the I2C address of the BME280 and edit it in Adafruit-BME280.h  (0x77 -> 0x76)

* look [here](https://github.com/verschwoerhaus/ttn-ulm-workshop-the-things-uno#the-things-uno-workshop--ulm-digital) for a great description how to configure the console, add application and devices

### decoder in console
function Decoder(bytes, port) {
  var SDS_ID      = (bytes[3] << 24) | (bytes[2] << 16) | (bytes[1] << 8) | bytes[0];

var SDS_PM10    = (bytes[4] << 8)  | bytes[5];

var SDS_PM25    = (bytes[6] << 8)  | bytes[7];

var temp_x      = (bytes[8] <<8)   | bytes[9];

var hum_x       = (bytes[10] <<8)  | bytes[11];

var press_bme   = (bytes[12] <<8)  | bytes[13];

//  var batteryV    = (bytes[x] <<8) | bytes[x];

return {

SDS_ID:       SDS_ID,

PM10:         SDS_PM10 / 10,

PM25:         SDS_PM25 / 10,

Temperature:  temp_x / 100,

Humidity:     hum_x / 100,

Pressure:     press_bme

//  batteryV:  batteryV / 1000         not i,plemented jet

}

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