This Arduino project automatically adjusts the speed of a DC motor (fan) based on ambient temperature using a TMP36 sensor. It includes visual (LEDs) and auditory (buzzer) alerts for specific temperature ranges.
- 🌀 Motor speed controlled using PWM based on temperature.
- 🟢 Green LED for safe temperature (< 40°C).
- 🔴 Red LED for caution (40°C–79°C) and steady warning if > 79°C.
- 🔊 Buzzer alarm at critical temperatures (> 79°C).
- 📟 Serial monitor displays temperature and PWM values.
| Component | Quantity |
|---|---|
| Arduino UNO | 1 |
| TMP36 Temperature Sensor | 1 |
| DC Motor (or Fan) | 1 |
| Green LED | 1 |
| Red LED | 1 |
| Buzzer | 1 |
| Breadboard + Jumper Wires + Resistors | As needed |
| Arduino Pin | Connected To |
|---|---|
| A3 | TMP36 Output |
| 6 | Motor (via PWM) |
| 4 | Green LED |
| 2 | Red LED |
| 3 | Buzzer |
- < 40°C : Green LED on, motor may run at low PWM, buzzer off.
- 40–79°C : Red LED blinks, indicating caution. Motor speed increases with temperature.
- > 79°C : Red LED stays on, buzzer sounds continuously to alert danger.
Example output from Serial Monitor: