Example Code for Arduino-Temperature and Humidity Sensor Reading Test

Hardware Preparation

• DFRduino UNO R3 (or similar) x 1
• SEN0528 Gravity: AHT20 Temperature and Humidity Sensor x 1
• M-M/F-M/F-F Jumper wires

Software Preparation

• Arduino IDE
• Download and install the DFRobot_AHT20 Library. (About how to install the library?)

Wiring Diagram

UNO Board: 3V3 - connect to - AHT20:+

UNO Board: GND - connect to - AHT20:-

UNO Board: SCL - connect to - AHT20:C

UNO Board: SDA - connect to - AHT20:D

Sample Code

The following code will read the measured values from the AHT20 temperature and humidity sensor and print them through the serial port.

    #include "DFRobot_AHT20.h"
    DFRobot_AHT20 aht20;
    void setup(){
      Serial.begin(115200);
      while(!Serial){
      }
      uint8_t status;
      while((status = aht20.begin()) != 0){
        Serial.print("AHT20 sensor initialization failed. error status : ");
        Serial.println(status);
        delay(1000);
      }
    }
    void loop(){
      if(aht20.startMeasurementReady(true)){
        Serial.print("temperature(-40~85 C): ");
        Serial.print(aht20.getTemperature_C());
        Serial.print(" C, ");
        Serial.print(aht20.getTemperature_F());
        Serial.print(" F\t");
        Serial.print("humidity(0~100): ");
        Serial.print(aht20.getHumidity_RH());
        Serial.println(" %RH");
        delay(8000);
      }
    }

Result

The results are as shown in the figure below, the temperature values in ℃ and ℉, and humidity values are displayed in the serial monitor.