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AHT10 High Precision Digital Temperature And Humidity Measurement Module

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Ekostra Electronics

On April 13, 2025

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AHT10 High Precision Digital Temperature & Humidity Sensor

I2C interface environmental sensor with ±0.3°C temperature and ±2% humidity accuracy

Introduction

The AHT10 is a high-precision, fully calibrated digital temperature and humidity sensor with an I2C interface. This compact module provides excellent measurement accuracy with very low power consumption, making it ideal for IoT devices, weather stations, and environmental monitoring systems.

Key Features

🌡️ High Accuracy

±0.3°C temperature, ±2% humidity

🔌 Digital Interface

I2C communication (up to 400kHz)

⚡ Low Power

0.25μA sleep current

🔄 Fast Response

Measurement time ≤ 75ms

🔍 Fully Calibrated

Factory calibrated, no adjustment needed

💎 Compact Size

11.5mm × 15mm × 5.5mm

Technical Specifications

Measurement Range (Temp)	-40°C to +85°C
Accuracy (Temp)	±0.3°C (@25°C)
Resolution (Temp)	0.01°C
Measurement Range (RH)	0% to 100%
Accuracy (RH)	±2% (20-80%)
Resolution (RH)	0.024%
Supply Voltage	1.8V to 3.6V (3.3V typical)
Current Consumption	0.25μA (sleep), 320μA (measuring)
Response Time	≤75ms
Interface	I2C (address 0x38)
Operating Range	-40°C to +85°C, 0-100% RH

Pin Configuration

Pin	Label	Description
1	VDD	Power supply (1.8-3.6V)
2	GND	Ground
3	SCL	I2C clock line
4	SDA	I2C data line

Note: Some modules include pull-up resistors (typically 4.7kΩ) on SDA/SCL lines

Arduino Connection

AHT10 Arduino Wiring

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

Adafruit_AHTX0 aht;

void setup() {
  Serial.begin(9600);
  while (!Serial) delay(10); // Wait for serial monitor

  if (!aht.begin()) {
    Serial.println("Could not find AHT10 sensor!");
    while (1) delay(10);
  }
  Serial.println("AHT10 initialized");
}

void loop() {
  sensors_event_t humidity, temp;
  aht.getEvent(&humidity, &temp); // Get data
  
  Serial.print("Temperature: "); 
  Serial.print(temp.temperature); 
  Serial.println("°C");
  
  Serial.print("Humidity: "); 
  Serial.print(humidity.relative_humidity); 
  Serial.println("%");
  
  delay(2000); // Wait 2 seconds
}

#include <Wire.h>

#include <Adafruit_AHTX0.h>

Adafruit_AHTX0 aht;

void setup() {

Serial.begin(9600);

while (!Serial) delay(10); // Wait for serial monitor

if (!aht.begin()) {

Serial.println("Could not find AHT10 sensor!");

while (1) delay(10);

}

Serial.println("AHT10 initialized");

}

void loop() {

sensors_event_t humidity, temp;

aht.getEvent(&humidity, &temp); // Get data

Serial.print("Temperature: ");

Serial.print(temp.temperature);

Serial.println("°C");

Serial.print("Humidity: ");

Serial.print(humidity.relative_humidity);

Serial.println("%");

delay(2000); // Wait 2 seconds

}

Library Required: Install “Adafruit AHTX0” library via Arduino Library Manager

Measurement Process

Power on the sensor (wait ≥20ms after power-up)
Send initialization command (0xE1)
Trigger measurement (0xAC)
Wait for measurement completion (≤75ms)
Read 6 bytes of data (temperature + humidity)
Convert raw data to physical values

Note: The sensor automatically enters sleep mode after measurement to save power

Accuracy Considerations

Temperature Accuracy

±0.3°C @25°C

±0.5°C over full range

Humidity Accuracy

±2% RH (20-80% RH)

±3% RH (0-100% RH)

Factors Affecting Accuracy

• Self-heating (minimize measurement frequency)

• Airflow (avoid stagnant air)

• Direct sunlight (affects readings)

Troubleshooting

Sensor Not Detected

Check I2C address (default 0x38)
Verify wiring (SDA/SCL connections)
Ensure pull-up resistors are present (4.7kΩ recommended)
Check power supply voltage (1.8-3.6V)

Incorrect Readings

Allow sensor to stabilize after power-up (≥20ms)
Ensure proper delay between measurements (≥1s)
Check for condensation on sensor
Verify calibration status

Communication Errors

Check I2C bus speed (≤400kHz)
Shorten cable length if using long wires
Ensure only one master on I2C bus
Verify no address conflicts

Application Examples

🏠 Smart Home

Climate monitoring and control

🌦️ Weather Stations

Portable environmental monitoring

🏭 Industrial

Equipment environmental sensing

🌱 Agriculture

Greenhouse monitoring systems

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AHT10 High Precision Digital Temperature And Humidity Measurement Module

AHT10 High Precision Digital Temperature & Humidity Sensor

Introduction