How to Use My comp: Examples, Pinouts, and Specs

• My Comp is a custom electronic component designed by Arduino, combining the functionality of the AHT20 temperature and humidity sensor with the BMP280 barometric pressure sensor. This hybrid module is tailored for applications requiring precise environmental monitoring, such as weather stations, IoT devices, and industrial automation systems.
• Common use cases include:
  • Environmental monitoring and data logging
  • Smart home systems
  • Altitude measurement for drones and robotics
  • HVAC (Heating, Ventilation, and Air Conditioning) systems

1. Wiring the Component:

   • Connect the VCC pin to a 3.3V or 5V power source.
   • Connect the GND pin to the ground of your circuit.
   • Connect the SDA pin to the SDA pin on your Arduino (A4 on Arduino UNO).
   • Connect the SCL pin to the SCL pin on your Arduino (A5 on Arduino UNO).

2. Install Required Libraries:

   • Install the Adafruit_AHTX0 and Adafruit_BMP280 libraries from the Arduino Library Manager.

3. Upload Example Code:

   • Use the following code to read temperature, humidity, and pressure data:

#include <Wire.h>
#include <Adafruit_AHTX0.h> // Library for AHT20 sensor
#include <Adafruit_BMP280.h> // Library for BMP280 sensor

// Create sensor objects
Adafruit_AHTX0 aht;
Adafruit_BMP280 bmp;

void setup() {
  Serial.begin(9600);
  while (!Serial); // Wait for Serial Monitor to open

  // Initialize AHT20 sensor
  if (!aht.begin()) {
    Serial.println("Failed to initialize AHT20 sensor!");
    while (1);
  }
  Serial.println("AHT20 sensor initialized.");

  // Initialize BMP280 sensor
  if (!bmp.begin(0x76)) { // Default I2C address for BMP280
    Serial.println("Failed to initialize BMP280 sensor!");
    while (1);
  }
  Serial.println("BMP280 sensor initialized.");
}

void loop() {
  // Read data from AHT20
  sensors_event_t humidity, temp;
  aht.getEvent(&humidity, &temp);

  // Read data from BMP280
  float pressure = bmp.readPressure() / 100.0F; // Convert to hPa

  // Print sensor data
  Serial.print("Temperature (AHT20): ");
  Serial.print(temp.temperature);
  Serial.println(" °C");

  Serial.print("Humidity (AHT20): ");
  Serial.print(humidity.relative_humidity);
  Serial.println(" %");

  Serial.print("Pressure (BMP280): ");
  Serial.print(pressure);
  Serial.println(" hPa");

  delay(2000); // Wait 2 seconds before next reading
}

• Ensure proper pull-up resistors (typically 4.7kΩ) are connected to the SDA and SCL lines if not already included on the module.
• Avoid placing the sensor in direct sunlight or near heat sources to ensure accurate readings.
• Use a decoupling capacitor (e.g., 0.1µF) between VCC and GND to reduce noise in the power supply.

1. Sensor Not Detected:

   • Ensure the wiring is correct and matches the pin configuration.
   • Verify that the I2C address (default: 0x76 for BMP280) is correct in the code.

2. Inaccurate Readings:

   • Check for environmental factors like condensation or dust on the sensor.
   • Calibrate the sensor if necessary using reference equipment.

3. Arduino Freezes or Crashes:

   • Ensure the power supply is stable and sufficient for the Arduino and sensors.
   • Check for loose connections or short circuits.

• Can I use this module with a 3.3V microcontroller? Yes, the module supports both 3.3V and 5V logic levels.

• What is the maximum cable length for I2C communication? The maximum length depends on the pull-up resistor values and operating frequency, but typically it is recommended to keep it under 1 meter for reliable communication.

• Can I use this module outdoors? While the sensors can operate outdoors, they should be protected from direct exposure to water, dust, and extreme conditions.

This concludes the documentation for the My Comp module.