Quantity   Component name
2 × water plastic pipe ∅21mm and ∅48mm
1 × Pvc sheet
1 × Plastic adhesive
1 × Arduino pro mini
1 × HC-SR04 Ultrasonic sensor
1 × battery 3.7v 500mah
1 × Adapter 5v0.5a
2 × micro dc coin vibrator motor
1 × relay 3v3a
1 × opto pc817
3 × resistor 10k ohm
1 × resistor 1.5k ohm
4 × resistor 200 ohm
2 × transistor c1815
2 × diode fr107
1 × Jack DC
1 × led Fiber Optics / Emitters
1 × button
1 × buzzer
1 × Small wire
1 × Tin solder