Integration of the RAK12039 Sensor

This document outlines the complete process for integrating the RAK12039 sensor (based on the SCD30 sensor

BeginnerWork in progress2 hours67

Things used in this project

Hardware components

RAK12039

RAK1906

RAK11300

RAK19007-O

Software apps and online services

Arduino IDE

The Things Industries The Things Stack

Hand tools and fabrication machines

Digilent Screwdriver

Story

Integration of the RAK12039 Sensor into the IoT System for Environmental Monitoring in Hydroponic Cultivation with LoRaWAN

Introduction

This document outlines the complete process for integrating the RAK12039 sensor (based on the SCD30 sensor from Sensirion, specialized in measuring CO₂, temperature, and humidity) into an existing IoT system based on WisBlock technology and LoRaWAN. This integration expands the system's capabilities by providing critical information about air quality and carbon dioxide balance, which is essential for environmental control in hydroponic cultivation.

Components Used

RAK12039: Environmental sensor for CO₂, temperature, and humidity (based on the SCD30).
RAK1906: Environmental sensor (temperature, relative humidity, atmospheric pressure, and IAQ).
RAK11300: Central WisBlock module with RP2040 microcontroller and LoRa connectivity.
RAK19007-O: WisBlock baseboard that allows modular connection of sensors and modules.
TTN Platform: Public LoRaWAN network for data management and visualization.

Sensor Assembly and Connection

Connecting the RAK12039:
Insert the RAK12039 module into one of the available I2C ports (preferably into Slot B if Slot A is already occupied).
Secure the sensor using the included screws.

Connecting the RAK1906:
Insert the RAK1906 into the other available I2C port (Slot A, if available).
Both sensors can share the I2C bus without conflict, as their addresses are different (0x61 for the RAK12039 and 0x76 for the RAK1906).
Verification:
When powering the system, ensure that the LED on the RAK11300 blinks.
Open the serial monitor in the IDE to verify that both sensors are correctly recognized.

Arduino IDE Setup

Prerequisites:
Install the Arduino IDE.
Add the RAKWireless package URL:https://downloads.rakwireless.com/RUI/RUI3/Arduino/package_rakwireless_index.json
Install the following libraries:
Adafruit BME680
SparkFun SCD30 Arduino Library
WisBlock-API
LoRaWan-RAK11300
Board and Port Configuration:
Select the WisBlock RAK11300 board.
Connect the node via USB Type-C and select the correct port.

Conclusion

The integration of the RAK12039 sensor into the system enables real-time CO₂ level monitoring, complementing the environmental data provided by the RAK1906. This integration is essential for improving environmental control in hydroponic cultivation systems, optimizing photosynthesis and ventilation, and aligning with the Sustainable Development Goals (SDGs 2, 7, 9, and 13). The resulting system is scalable, accurate, and energy self-sufficient—ideal for educational, agricultural, or experimental settings.

Code

Source Code for RAK12039 + RAK1906

#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BME680.h>

// I2C address for BME680
Adafruit_BME680 bme; // Uses default I2C address 0x76

// RAK12039 Touch sensor on IO1
#define TOUCH_SENSOR_PIN WB_IO1

void setup() {
  Serial.begin(115200);
  while (!Serial);

  pinMode(TOUCH_SENSOR_PIN, INPUT);

  Serial.println("Initializing RAK1906 (BME680)...");
  if (!bme.begin()) {
    Serial.println("Could not find a valid BME680 sensor, check wiring!");
    while (1);
  }

  // Configure BME680 oversampling and filter settings
  bme.setTemperatureOversampling(BME680_OS_8X);
  bme.setHumidityOversampling(BME680_OS_2X);
  bme.setPressureOversampling(BME680_OS_4X);
  bme.setIIRFilterSize(BME680_FILTER_SIZE_3);
  bme.setGasHeater(320, 150); // 320*C for 150 ms
}

void loop() {
  // Read touch sensor
  int touchValue = digitalRead(TOUCH_SENSOR_PIN);
  Serial.print("Touch Sensor State: ");
  Serial.println(touchValue == HIGH ? "TOUCHED" : "NOT TOUCHED");

  // Trigger BME680 reading
  if (!bme.performReading()) {
    Serial.println("Failed to perform reading from BME680");
    return;
  }

  Serial.print("Temperature = ");
  Serial.print(bme.temperature);
  Serial.println(" *C");

  Serial.print("Humidity = ");
  Serial.print(bme.humidity);
  Serial.println(" %");

  Serial.print("Pressure = ");
  Serial.print(bme.pressure / 100.0);
  Serial.println(" hPa");

  Serial.print("Gas Resistance = ");
  Serial.print(bme.gas_resistance / 1000.0);
  Serial.println(" KOhms");

  Serial.println("---------------------------");

  delay(2000); // Delay between readings
}

Credits

Miguel Montiel Vega

11 projects • 9 followers

Teacher at Maude Studio & Erasmus+ project member: "Developing Solutions to Sustainability Using IoT" (2022-1-PT01-KA220-VET-000090202)

Antonio Valente

12 projects • 9 followers

Antonio Valente is a Professor at UTAD University and Principal researcher of Developing Solutions to sustainability using IoT. LoRaWAN

Thanks to Jose Miguel fuentes Garcia , and JoseCarlos Rosado.

Integration of the RAK12039 Sensor