Description
The DHT Pro Shield is a stackable expansion board designed specifically for the WeMos D1 mini (ESP8266) development board, built around the DHT22 (AM2302) digital temperature and humidity sensor. Unlike generic sensor modules that require jumper wires, this shield plugs directly onto the D1 mini’s dual-row headers, creating a compact, integrated environmental sensing node ideal for IoT projects. The DHT22 sensor offers significantly better accuracy and a wider measurement range than the DHT11 used on the standard DHT Shield, with ±0.5°C temperature accuracy and ±2% RH humidity accuracy . Data is transmitted via a single-bus protocol on pin D4 (GPIO2), making it fully compatible with standard Arduino DHT libraries and MicroPython’s built-in dht module. This shield is well-suited for both individual makers building weather stations or home automation systems and business purchasers seeking a reliable, production-ready sensing platform for environmental monitoring deployments.
Features
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Direct Stacking Design: Plugs directly onto the WeMos D1 mini headers without jumper wires, creating a compact, stable assembly for deployment or prototyping .
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DHT22 Sensor Onboard: Provides higher accuracy and wider range than the DHT11-based standard DHT Shield, with ±0.5°C and ±2% RH typical accuracy .
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Fixed D4 (GPIO2) Data Pin: The sensor is permanently wired to pin D4, eliminating pin assignment errors and simplifying code configuration .
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Standard Library Compatibility: Works with the Adafruit DHT sensor library for Arduino and the built-in
dhtmodule for MicroPython, with no custom drivers required . -
Single-Bus Digital Interface: Requires only one data line for communication, minimizing GPIO usage and leaving other pins available for additional shields or peripherals .
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Compact Form Factor: Matches the D1 mini footprint, making it suitable for space-constrained enclosures and permanent installations.
Technical Specifications
| Parameter | Specification |
|---|---|
| Compatible Board | WeMos D1 mini (ESP8266) |
| Sensor Element | DHT22 / AM2302 |
| Temperature Range | -40°C to +80°C |
| Temperature Accuracy | ±0.5°C (typical) |
| Humidity Range | 0% to 99.9% RH |
| Humidity Accuracy | ±2% RH (typical, at 25°C) |
| Data Interface | Single-bus, fixed on pin D4 (GPIO2) |
| Minimum Sampling Interval | 2 seconds |
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