Tiago ESP

Connecting the AHT10 to Wemos D1 Mini

The AHT10 temperature sensor is a high-precision digital sensor that provides accurate temperature and humidity readings. In this tutorial, we’ll guide you through the process of connecting the AHT10 sensor to the Wemos D1 Mini, a popular ESP8266-based development board, and displaying the sensor data on the Serial Monitor using the Arduino IDE.

Materials Needed:

 

 

 

 

Step 1:

Wiring Connections Start by connecting the AHT10 sensor to the Wemos D1 Mini using jumper wires and a breadboard. The AHT10 sensor has four pins: VCC, GND, SDA, and SCL. Follow these connections:

  • Connect the AHT10 VCC pin to the 3.3V pin on the Wemos D1 Mini.
  • Connect the AHT10 GND pin to the GND pin on the Wemos D1 Mini.
  • Connect the AHT10 SDA pin to the D2 pin on the Wemos D1 Mini.
  • Connect the AHT10 SCL pin to the D1 pin on the Wemos D1 Mini.

 

 

Your connections should look like this:

 

 

Step 2:

Installing Necessary Libraries Before writing the code, make sure you have the necessary libraries installed in the Arduino IDE. Open the Arduino IDE, go to Sketch -> Include Library -> Manage Libraries, and search for “Adafruit Unified Sensor” and “Adafruit AHTX0.” Install both libraries.

 

 

Step 3:

Writing the Arduino Code Now, it’s time to write the Arduino code. Open the Arduino IDE and create a new sketch. Copy and paste the following code:

 

#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_AHTX0.h>

Adafruit_AHTX0 aht;

void setup() {
  Serial.begin(115200);
  while (!Serial) {
    delay(10);
  }

  Serial.println("AHT10 Sensor Test");

  if (!aht.begin()) {
    Serial.println("Couldn't find AHT10 sensor!");
    while (1);
  }
}

void loop() {
  sensors_event_t humidity, temperature;
  aht.getEvent(&humidity, &temperature);

  Serial.print("Humidity: ");
  Serial.print(humidity.relative_humidity);
  Serial.print(" %\t");
  
  Serial.print("Temperature: ");
  Serial.print(temperature.temperature);
  Serial.println(" °C");

  delay(1000);
}

 

This code initializes the AHT10 sensor, reads temperature and humidity values, and prints them to the Serial Monitor.

Step 4:

Uploading the Code Connect the Wemos D1 Mini to your computer using a USB cable. Select the appropriate board (Wemos D1 R2 & Mini) and port in the Arduino IDE. Click the “Upload” button to upload the code to the Wemos D1 Mini.

Step 5:

Viewing Data on Serial Monitor Once the code is uploaded, open the Serial Monitor (Tools -> Serial Monitor) in the Arduino IDE. You should see the temperature and humidity readings being printed every second.

 

 

FAQ (Frequently Asked Questions)

Q1: Can I power the AHT10 sensor with a higher voltage?

  • No, the AHT10 sensor operates on 3.3V, and providing a higher voltage may damage the sensor. Make sure to connect the VCC pin to the 3.3V output on the Wemos D1 Mini.

Q2: Why am I getting inaccurate readings from the AHT10 sensor?

  • Ensure that your wiring connections are correct. Double-check the pin connections, and make sure the sensor is receiving power. Additionally, verify that you have installed the required libraries correctly in the Arduino IDE.

Q3: Can I use a longer cable to connect the AHT10 sensor to the Wemos D1 Mini?

  • It’s recommended to keep the cable length as short as possible to avoid signal degradation. If you need a longer connection, consider using shielded cables or I2C signal repeaters.

Troubleshooting

Issue: “Couldn’t find AHT10 sensor!” error in Serial Monitor.

  • Double-check the wiring connections. Ensure that the sensor is receiving power, and the SDA and SCL lines are connected correctly. Make sure you’ve installed the Adafruit Unified Sensor and Adafruit AHTX0 libraries.

 

 

Issue: No data is displayed on the Serial Monitor.

  • Check the baud rate in the Serial Monitor; it should be set to 115200, as specified in the code. Ensure that the Wemos D1 Mini is properly connected to the computer, and the correct COM port is selected in the Arduino IDE.

Issue: Inconsistent or unstable readings.

  • Ensure that the AHT10 sensor is placed in a stable environment with minimal airflow. Rapid changes in temperature or humidity can affect the sensor’s accuracy.

Issue: The Wemos D1 Mini is not recognized by the Arduino IDE.

  • Make sure you have installed the necessary USB drivers for the Wemos D1 Mini on your computer. Select the correct board (Wemos D1 R2 & Mini) and port in the Arduino IDE.

Issue: Temperature readings are unusually high or low.

  • Confirm that the AHT10 sensor is not exposed to extreme temperatures or humidity levels. If the sensor is damaged or faulty, consider replacing it with a new one.

By addressing these common questions and troubleshooting steps, you should be able to successfully connect the AHT10 temperature sensor to the Wemos D1 Mini and troubleshoot any issues that may arise during the process.

Conclusion:

Congratulations! You’ve successfully connected the AHT10 temperature sensor to the Wemos D1 Mini and displayed the sensor data on the Serial Monitor. This project serves as a foundation for more advanced IoT applications where you can send sensor data to the cloud or integrate it with other devices. Experiment with different sensors and explore the vast possibilities of the Wemos D1 Mini and the Arduino platform.