AHT25 Temperature Humidity Sensor — I²C Digital Output
AHT25 Integrated Temperature and Humidity Sensor — High Accuracy I²C Digital Output
The AHT25 is a compact, calibrated digital temperature and humidity sensor with an I²C interface. It delivers accurate environmental data for IoT, weather stations, and automation projects. Its fully molded package and low power consumption make it reliable for battery-powered applications.
Key Specifications
| Specification | Value |
|---|---|
| Supply Voltage | 1.8 V to 3.6 V |
| Current Consumption | 0.25 µA (sleep), 0.98 mA (measuring) |
| Humidity Range / Accuracy | 0–100% RH; ±2% RH (typical) |
| Temperature Range / Accuracy | -40°C to +85°C; ±0.3°C (typical) |
| Interface | I²C, up to 1 MHz |
| Package Dimensions | 3.0 mm × 3.0 mm × 1.0 mm |
What You Can Build With This
- A local weather station that logs data to an SD card or cloud dashboard.
- An automated greenhouse controller that activates fans or misters based on humidity.
- A room climate monitor with an e‑paper display for egg incubators.
- A smart home sensor node that reports conditions via MQTT over Wi‑Fi.
Compatibility
The sensor operates on 3.3 V logic, making it a direct fit for Arduino boards (Uno, Nano) with a level shifter, and fully compatible with ESP32, ESP8266, Raspberry Pi Pico, and standard Raspberry Pi single‑board computers. The I²C address is 0x38 (backward‑compatible).
Wiring Notes
Connect SDA and SCL to the corresponding I²C pins on your microcontroller. Add 4.7 kΩ pull‑up resistors to both lines if the board lacks internal pull‑ups. The supply pin must not exceed 3.6 V; typical 3.3 V operation is recommended.
Why Buy from Compoden
Every component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.
Is this compatible with Arduino?
Yes. It works with any Arduino board running at 3.3 V, such as the Arduino Uno or Nano with an external level shifter. Use the Adafruit AHTx0 library for easy integration.
Can I use it outdoors without a protective case?
The sensor is not waterproof. For outdoor use, install it inside a weather shield that allows air flow but blocks direct rain and dust.
What accuracy can I expect compared to a DHT22?
The AHT25 offers tighter accuracy (±0.3°C, ±2% RH) than a typical DHT22 (±0.5°C, ±2-5% RH). It also has a faster response time and lower power draw.
📦 Free Setup Handoff Document Included
Every Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.
Ask Soldr above what you can build with this — it knows every Compoden kit this part appears in.
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items