16mm ProMax PPS16006YPM Metal Push Button Switch Waterproof Momentary Yellow 3-6V 5K ohm 16mm Rotatory Variable Potentiometer (Pack of 5) 1 x HC-SR04 Ultrasonic Sensor

1 x HC-SR04 Ultrasonic Sensor Module

(2 good battery + a use effect = 3 low battery low battery use effect)

and storage solutions

credit-card-sized computer designed for makers

16mm ProMax PPS16006YPM Metal Push Button Switch Waterproof Momentary Yellow 3-6V 5K ohm 16mm Rotatory Variable Potentiometer (Pack of 5) 1 x HC-SR04 Ultrasonic Sensor16mm ProMax PPS16006YPM Metal Push Button Switch Waterproof Momentary Yellow 3 6V 16mm ProMax PPS16006YPM Metal Push Button Switch Waterproof Momentary Yellow 3 6V Difference between Momentary self reset and Latching: 1. Momentary Self reset: When you press the button, press key will automatically return. (Like a car horn switch. Press it power on, release it power off.) 2. Latching: When you press the button, press key will stay in position until you