DHT22 / AM2302 Temperature & Humidity
by Aosong
SKU: PSA-CMP-DHT22
No reviews yetTypical India street price
₹90–₹180
More accurate DHT for serious weather stations.
Interface: Single-wire digital
Single-wire DHT for weather-station Blockly or Arduino sketches.
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Concept
DHT22 / AM2302 is the more accurate sibling of DHT11 for serious classroom weather stations and cold-storage demos.
A little theory
Same single-wire digital protocol as DHT11 with tighter sensing elements. Typical accuracy about ±0.5 °C and ±2–5 %RH, with a wider range (about −40 to 80 °C). Still not a lab-certified instrument, but far better for graphs and science-fair logs. Recovery time between samples is still required. In the classroom, treat DHT22 / AM2302 Temperature & Humidity as a beginner part using Single-wire digital. Typical India street price is about ₹90–₹180. Always verify voltage and pin labels on your exact module — silk screens vary across clones. Start with a datasheet or trusted learn guide, power the part correctly, share GND with the MCU, and test with a simple blink/read sketch before building the full project. Measure voltages with a multimeter when something fails, and keep actuator current off the MCU regulator.
How it works in a project
Same libraries as DHT11 — set sensor type to DHT22/AM2302. Module usually includes the pull-up. Log to SD or OLED for multi-hour runs.
Classroom & project use
- Lab climate log
- Cold-storage demo
- Outdoor weather (sheltered)
- Compare vs DHT11 accuracy
Buying in India
Precautions
- Allow ≥2 s between reads
- Protect from condensation on electronics
- Calibrate expectations — not medical grade
Specifications
| Accuracy | ±0.5 °C typical |
| Interface | 1-wire |
| Temp range | −40–80 °C |
| RH range | 0–100 % (module dependent) |
| Category | Sensors |
| Difficulty | Beginner |
| Voltage | 3.3–5V |
Pinout
VCC | DATA | NC | GND
