5pcs AHT20 Humidity Temperature Sensor Module I2C Interface Upgraded from DHT11 Accurate for Arduino

Product Parameters​​
​​Core Chip:​​ AHT20 ( , SMD Package)
​​Input Voltage:​​ 2.2V – 5.5V DC (Wide Voltage Compatible, 3.3V Recommended)
​​Temperature Range:​​ -40°C to +85°C
​​Temperature Accuracy:​​ ±0.3°C (Typical @25°C)
​​Temperature Resolution:​​ 0.01°C
​​Humidity Range:​​ 0% to 100% RH
​​Humidity Accuracy:​​ ±2% RH (Typical in 20%~80% RH range)
​​Humidity Resolution:​​ 0.024% RH
​​Interface:​​ I²C (Default Address 0x38, supports 100kHz/400kHz)
​​Operating Current:​​ 1.5mA (Measurement mode)
​​Standby Current:​​ 0.2μA (Sleep mode)
​​Calibration:​​ Factory pre-calibrated
​​Pinout Description​​
​​VDD:​​ Positive power input (2.2V-5.5V DC). A 10μF decoupling capacitor to GND is recommended.
​​GND:​​ Power ground. Should share a common ground with the MCU.
​​SCL:​​ I²C serial clock line (open-drain). Requires an external ~4.7kΩ pull-up resistor to VDD.
​​SDA:​​ I²C serial data line (open-drain). Requires an external ~4.7kΩ pull-up resistor to VDD.
​​NC × 2:​​ No internal connection. Do not connect.
​​Frequently Asked Questions (FAQ)​​
​​Q1: I²C communication fails (No response from sensor).​​
​​A:​​ Confirm the I²C address is set to 0x38. Check if external ~4.7kΩ pull-up resistors are installed on both SCL and SDA lines. Try sending a soft reset command (0xBA) via I²C.
​​Q2: Temperature/Humidity data is unstable or drifts.​​
​​A:​​ Ensure a 10μF decoupling capacitor is placed between VDD and GND to filter power noise. Avoid placing the module in direct airflow or sunlight.

【High Accuracy Humidity and Temperature Measurement】 ±0.3°C temperature accuracy; ±2% RH humidity accuracy; 0.01°C resolution; 0.024% RH resolution; Suitable for smart home automation and Settingal monitoring
【Low Power Consumption for Long-Term Operation】 1.5mA operating current; 0.2µA sleep mode; 2.2V to 5.5V wide voltage range; suitable for battery-powered devices and portable systems
【I2C Interface with Easy Integration】 I²C communication (default address 0x38); 100kHz/400kHz support; compatible with for Arduino and for Raspberry Pi; requires 4.7kΩ pull-up resistors on SCL and SDA
【Factory Calibrated for Reliable Performance】 No user calibration required; pre-calibrated at factory; waterproof PTFE membrane design (AHT20-F model) for dust and moisture resistance
【Fast Response Time for Real-Time Monitoring】 8 seconds for humidity; 5 seconds for temperature; stable output in ambient conditions; recommended for indoor climate control and greenhouse applications