BoardPilotDHT20 temperature + humidity (I2C) with ESP32
Supply 3.3-5 V
Bus I2C
I2C address
0x38
Measures temperature, humidity
Pins and ESP32 wiring
| Pin | Role | ESP32 pin | Notes |
|---|---|---|---|
| VDD | Power | 3V3 | Pin 1 (left, grille facing you) |
| SDA | I2C data (SDA) | D21 | Needs a pull-up to 3.3 V (about 4.7 kΩ); the bare sensor has none |
| GND | Ground | GND | |
| SCL | I2C clock (SCL) | D22 | Needs a pull-up to 3.3 V (about 4.7 kΩ); the bare sensor has none |
Suggested wiring for the 30-pin ESP32 DevKit, avoiding flash, input-only and strapping pins. BoardPilot checks it for you as you wire.
Starter code (Arduino)
#include <Wire.h>
void setup() {
Serial.begin(115200);
Wire.begin(21, 22); // SDA = GPIO 21, SCL = GPIO 22
Wire.beginTransmission(0x38);
bool found = Wire.endTransmission() == 0;
Serial.println(found ? "DHT20 temperature + humidity (I2C) found at 0x38" : "Not found: check power, GND and SDA/SCL");
}
void loop() {}Sources
- Aosong DHT20 datasheet, Pin 1 VDD, 2 SDA, 3 GND, 4 SCL; supply 2.2 to 5.5 V
- Aosong DHT20 datasheet, I2C address 0x38 (same as AHT20; the two cannot share a bus)
Try it in 3D in BoardPilot
Related parts
ADS1015 12-bit ADCADS1115 16-bit ADCADXL375 high-g accelerometer (±200 g)AHT10 temperature + humidityAHT20 + BMP280 combo moduleAHT20 temperature + humidity
Part data: CC BY 4.0, free to reuse with credit to BoardPilot.