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🌡️ Temperature Sensor Special — Sensing Hot and Cold
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Temp Sensor Experiments
🌡️ Three Sensors Compared
| Model | Accuracy | Price |
|---|---|---|
| LM35 analog voltage | ±0.5°C | ¥3 |
| DS18B20 digital 1-Wire | ±0.5°C | ¥5 |
| DHT22 digital temp/humidity | ±0.3°C | ¥12 |
🧪 Three Projects
- Digital thermometer: DS18B20 waterproof probe on skin, LCD shows green normal / red fever + buzz
- Thermostat fan: <28°C off / 28-35°C low / >35°C full + red warning
- Fire alarm: temp >60°C or smoke → sound/light alarm + WiFi push
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