AM2120 Digital Capacitive Temperature Humidity Sensor Module

📌 Product Overview

The AM2120 digital temperature and humidity composite sensor comes with factory pre-calibrated digital single-bus signal output. It adopts professional temperature & humidity acquisition technology to deliver ultra-high reliability and outstanding long-term stability. The module integrates a capacitive humidity sensing element and high-precision temperature measuring chip, matched with a high-performance microprocessor for signal processing. This sensor features premium consistency, ultra-fast response speed, strong anti-interference performance and excellent cost performance, with industrial-grade wide working temperature from -40℃ ~ +85℃ for stable long-term measurement.

🧠 Core Hardware Layout

1. Sensing Core: High-precision capacitive humidity sensing element + integrated temperature measurement chip
2. Signal Processing: Built-in high-performance microcontroller, factory fully calibrated
3. Housing Material: High-strength PC plastic shell with grid ventilation holes for rapid air exchange
4. Pin Definition: 4-pin straight pin header with standard 2.54mm pin pitch, easy for breadboard wiring
5. Output Interface: Standard single-bus bidirectional digital communication port, long-distance signal transmission support

⚙ Core Technical Specifications

• Model: AM2120
• Power Supply Voltage: DC 3.3V ~ 5.5V
• Measuring Range
  • Temperature: -40℃ ~ +80℃
  • Humidity: 0 ~ 99.9 %RH
• Measuring Accuracy
  • Temperature: ±0.5℃
  • Humidity: ±3%RH (under 25℃ standard environment)
• Annual Drift
  • Temperature Drift: ＜0.1℃/year
  • Humidity Drift: ＜0.5%RH/year
• Resolution
  • Temperature: 0.1℃
  • Humidity: 0.1 %RH
• Sensing Type: Capacitive humidity sensor
• Output Signal: Single-bus digital signal
• Shell Material: PC plastic
• Net Weight: 0.5g
• Working Temperature: -40℃ ~ +85℃
• Dimension: 12.1015.004.50mm
• Pin Pitch: 2.54mm

📍 4-Pin Pin Assignment Table

Pin No.	Pin Name	Function Description
①	VDD	Power supply input, DC 3.3V~5.5V
②	SDA	Bidirectional single-bus serial data communication pin
③	GND	Power ground reference pin
④	NC	Empty pin, no internal circuit connection

✨ Product Highlights

✅ Pre-calibrated factory module: Fully interchangeable without secondary calibration ✅ Mini compact size: Tiny lightweight 0.5g structure, convenient for embedded integration ✅ Ultra-low power consumption: Suitable for battery-powered portable monitoring equipment ✅ Standard single-bus interface: Simple wiring, supports ultra-long signal transmission distance ✅ Excellent long-term stability: Low annual temperature & humidity drift, long service life ✅ Strong anti-interference capability: Stable data output under complex industrial electromagnetic environment ✅ High cost performance: Capacitive sensing design with high precision and low cost ✅ Wide industrial temperature range: -40℃ ~ +85℃ stable operation for indoor & outdoor monitoring

🛒 Application Scenarios

1. Agricultural Greenhouse Planting: Real-time temperature & humidity monitoring for greenhouse crops
2. Industrial Production Workshop: Environmental detection for factory assembly lines, storage warehouses
3. Server Communication Room: Cabinet temperature & humidity monitoring for data center equipment
4. Medical & Health Equipment: Constant temperature and humidity monitoring for medical storage spaces
5. Scientific Research & Education: Experimental environmental data collection for school laboratory projects
6. Public Service Facilities: Library, mall, building indoor environmental monitoring
7. Smart Home DIY: Humidity & temperature collection for smart cabinet, air conditioner, humidifier

⚠ Important Usage Notice

1. Avoid long-term exposure to corrosive gas, oily smoke and dust, which will cause permanent sensing drift.
2. For high humidity measurement environment, reserve sufficient ventilation space on the sensor grid surface.
3. Single-bus communication wiring should use shielded cables for transmission distance over 10 meters to reduce signal interference.
4. Do not solder or touch the internal sensitive chip inside the ventilation grid to avoid calibration failure.

📦 Package List

1 × AM2120 Digital Capacitive Temperature Humidity Sensor Module