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 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

}

}