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The DHT22 is a capacitive humidity sensing digital module that outputs a calibrated digital signal for both temperature and humidity, using dedicated digital-signal-acquisition technology described by the listing as giving high reliability and excellent long-term stability. Its temperature range runs from -40C to 80C, with a resolution of 0.1C and an error under ±0.5C, and humidity is measured across the full 0 to 100% relative humidity range, at 0.1% resolution with ±2% error.
Because the output is already calibrated digitally, a microcontroller reading this sensor doesn't need to apply its own calibration curve or lookup table, unlike some cheaper analog temperature or humidity sensors, which simplifies the code needed to get accurate readings.
The sensor has a simple three-pin interface: Pin 1 for power (up to 5V with respect to ground), Pin 2 as the digital I/O interface to a microcontroller, and Pin 3 for ground. Supply voltage is 5V, and signal transmission distance can reach up to 20 meters, which matters for a weather station or environmental monitor where the sensor needs to be mounted somewhere other than directly next to the controlling board.
The module is rated for low power consumption and fast response with strong anti-jamming capability, meaning it holds up well against electrical noise on longer cable runs, which is a real consideration given its 20-meter signal range. It measures 38mm by 20mm.
Anyone building a weather station, greenhouse monitor, or environmental logging project that needs accurate, wide-range temperature and humidity readings, potentially with the sensor mounted some distance away from the main controller, will find the DHT22 a solid, well-calibrated choice.
-40C to 80C, with 0.1C resolution.
0 to 100% RH, with 0.1% resolution.
Yes, it outputs an already-calibrated digital signal.
Up to 20 meters.
Three: power, digital I/O, and ground.
| Brand | Generic |
|---|---|
| Accuracy | 0.5C / 2% RH |
| Selling unit | PCS |
