DHT11 Temperature & Humidity
by Aosong
SKU: PSA-CMP-DHT11
No reviews yetTypical India street price
₹40–₹80
Cheap climate sensor for weather-station projects.
Interface: Single-wire digital
Single-wire DHT for weather-station Blockly or Arduino sketches.
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Concept
DHT11 reports temperature and relative humidity on a single digital data pin — the classic first weather-station sensor.
A little theory
Inside: a capacitive humidity element and a thermistor, digitised by a tiny controller. It sends 40 bits (16 humidity + 16 temperature + checksum) using timed pulses on one wire with a pull-up. Specs are coarse (±2 °C, ±5 %RH); range roughly 0–50 °C and 20–90 %RH. Polling faster than about 1 Hz causes failed reads because the sensor needs recovery time. In the classroom, treat DHT11 Temperature & Humidity as a beginner part using Single-wire digital. Typical India street price is about ₹40–₹80. 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
Use Adafruit DHT or SimpleDHT library. Wire VCC, GND, DATA with ~4.7–10 kΩ pull-up (often on the module). Wait ≥1–2 s between readings. Prefer DHT22 when accuracy matters.
Classroom & project use
- Weather station
- Greenhouse alarm
- Comfort logger
- AC / fan automation demo
Buying in India
Precautions
- Do not poll faster than ~1 Hz
- Keep leads short
- Not a calibrated metrology instrument
Specifications
| Temp range | 0–50 °C |
| RH range | 20–90 % |
| Interface | 1-wire digital |
| Accuracy | ±2 °C / ±5 %RH typical |
| Category | Sensors |
| Difficulty | Beginner |
| Voltage | 3.3–5V |
Pinout
VCC | DATA | NC | GND (3-pin modules: VCC | DATA | GND)
