AHT20 + BMP280 combo module with ESP32

Supply 3.3-5 V Bus I2C I2C address 0x38 / 0x77 Measures temperature, humidity, pressure

Pins and ESP32 wiring

Pin	Role	ESP32 pin
VDD	Power	3V3
SDA	I2C data (SDA)	D21
GND	Ground	GND
SCL	I2C clock (SCL)	D22

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 ? "AHT20 + BMP280 combo module found at 0x38" : "Not found: check power, GND and SDA/SCL");
}

void loop() {}

Sources

Aosong AHT20 datasheet, I2C address 0x38
Bosch BMP280 datasheet, I2C interface: 0x77 when SDO = VDDIO (as wired on most combo boards)

Try it in 3D in BoardPilot

BoardPilot Part data (JSON)

Part data: CC BY 4.0, free to reuse with credit to BoardPilot.

AHT20 + BMP280 combo module with ESP32

Pins and ESP32 wiring

Starter code (Arduino)

Sources

Try it in 3D in BoardPilot

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