1. Temperature sensor
2. Humidity sensor
3. Travel switch
4. Photoresistor
5. Thermistor
6. Infrared tube
7. Infrared reflector
8. Air pressure sensor
9. Air pressure sensor
10. Ultrasonic sensor
11. Gyroscope, accelerometer sensor
12. Proximity sensor
13. Human body sensor
14. Flame sensor, using infrared
15. Vibration switch
16. Tilt switch
17. Sound sensor