Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Model Number | DHT22 / AM2302 |
| Measurement Range (Temperature) | -40°C to +80°C |
| Measurement Range (Humidity) | 0% to 100% RH |
| Accuracy (Temperature) | ±0.5°C |
| Accuracy (Humidity) | ±2% RH |
| Resolution | 0.1°C / 0.1% RH |
| Sampling Period | 2 Seconds |
| Operating Voltage | 3.3V to 6V DC |
| Output Signal | Single-bus Digital |
| Package Type | Module with Pull-up Resistor |
Anonymous
Mar 31, 2026
Rating: 5/5
Better than the DHT11
Upgraded from the DHT11 and the difference in precision is noticeable immediately. The wider temperature range also makes it suitable for outdoor use with a simple enclosure.
Anonymous
Mar 26, 2026
Rating: 4/5
Good accuracy for the price
I am using this to monitor my greenhouse environment. It handles the humidity well, though it takes a few seconds to update. For the cost, you really cannot beat the performance.
Anonymous
Mar 24, 2026
Rating: 5/5
Perfect for Arduino Projects
This sensor works flawlessly with my Arduino Uno. The readings are stable and match my calibrated hygrometer very closely. The module version is great because it includes the pull-up resistor, saving me time on wiring.
Anonymous
Mar 18, 2026
Rating: 5/5
Reliable and Easy to Code
Integrated easily into my ESP32 home automation system. The library support is excellent, and I haven't had any dropped signals since installation three months ago.
Anonymous
Mar 15, 2026
Rating: 5/5
Great for university projects
Bought this for my final year project on environmental monitoring. It provided consistent data throughout the testing phase. Highly recommended for students.
Anonymous
Mar 10, 2026
Rating: 4/5
Solid performer
Works as advertised. Just remember the sampling rate is 2 seconds, so don't expect instant updates if you are polling too fast. Otherwise, a great little sensor.
Q: Can I use this with a Raspberry Pi?
A: Absolutely. The DHT22 works well with Raspberry Pi GPIO pins. Just ensure you are using a 3.3V logic level, which matches the Pi's output, and install the appropriate Python library.
Q: How often should I calibrate this sensor?
A: The DHT22 is factory calibrated. Under normal operating conditions, it maintains accuracy for years. If used in extreme environments, comparing it against a reference device annually is good practice.
Q: Is this sensor waterproof?
A: The sensor probe itself has some resistance to humidity but is not fully waterproof. For outdoor or wet environments, please house it in a breathable protective enclosure.
Q: Does this module come with a pull-up resistor already installed?
A: Yes, this specific module version includes a 10k pull-up resistor on the data line, so you can connect it directly to your microcontroller without additional components.
Q: What is the maximum cable length recommended for accurate readings?
A: For reliable communication, we recommend keeping the cable length under 20 meters. If you need longer distances, consider using a shielded cable or a signal booster.
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