AHT20+BMP280 Temperature Humidity Air Pressure Sensor Module High-Precision I2C 2-5V for Arduino Raspberry Pi

Key Features & Benefits

🌡️ 2‑in‑1 Sensor: Temperature, humidity, and barometric pressure.

📊 High Precision: AHT20: ±0.3℃, ±2% RH; BMP280: ±1 hPa.

🔌 I2C Interface: Only 4 wires (VCC, GND, SCL, SDA).

🔋 Wide Voltage: 2.0-5V – works with 3.3V or 5V systems.

🧩 Ultra‑Compact: 16×16mm, 4P GROVE connector.

💻 Library Support: Arduino examples available.

📍 Applications: Weather stations, indoor monitoring, drone altitude hold.

Product Description

Need to monitor temperature, humidity, and air pressure simultaneously? AHT20+BMP280 2‑in‑1 sensor module is the perfect choice. Combines AHT20 (temp/humidity) and BMP280 (pressure). Digital I2C output, 2.0-5V power. Tiny 16×16mm board with 4P GROVE connector. Arduino examples included. Ideal for weather stations, drone altimeters, indoor air quality monitors.

⚡ Quick Start Guide & Important Tips

⚠️ Important:

I2C addresses: AHT20 = 0x38, BMP280 = 0x76.

Voltage: 2.0-5V, do not exceed 5.5V.

Pull‑up resistors: Module may have internal pull‑ups; if unstable, add 4.7kΩ to VCC.

Connector: 4P GROVE (1.27mm) or 2.54mm header – solder your own pins if needed.

🔹 Arduino Example Code

#include <Wire.h>
#include <Adafruit_AHTX0.h>
#include <Adafruit_BMP280.h>
Adafruit_AHTX0 aht;
Adafruit_BMP280 bmp;
void setup() {
Serial.begin(9600);
aht.begin();
bmp.begin(0x76);
}
void loop() {
sensors_event_t humidity, temp;
aht.getEvent(&humidity, &temp);
Serial.print("Temp: "); Serial.print(temp.temperature);
Serial.print(" ℃, Humidity: "); Serial.print(humidity.relative_humidity);
Serial.print(" %, Pressure: "); Serial.print(bmp.readPressure() / 100.0);
Serial.println(" hPa");
delay(1000);
}

🔹 Common Questions

❓ No data?
Check I2C wiring, power (2-5V), run I2C scanner for 0x38 and 0x76.

❓ Fluctuating readings?
Avoid heat/airflow sources, add averaging, ensure stable power.

❓ Need to solder pins?
Module has GROVE or pad holes – solder your own pins or use GROVE cable.

❓ BMP280 address?
Default 0x76.

Specifications

Chips: AHT20 + BMP280

Voltage: DC 2.0V – 5V

Interface: I2C (SCL, SDA)

Temp Accuracy: ±0.3℃

Humidity Accuracy: ±2% RH

Pressure Accuracy: ±1 hPa

Dimensions: 16×16×3mm

Connector: 4P GROVE

Note: Manual measurement, allow 1‑3mm error. Colors may vary.