Introduction: Automatic Liquid Dispenser Machine
This instructable will guide you to make your DIY automatic liquid dispenser machine,
you can use it for sanitizer and water hand wash etc.
It is contactless, seamless, and hygienic.
Step 1: Schematics
Arduino to HC-SR04 connection:-
1. Vcc to 5v
2. Trig to D5
3. Echo to D4
4. GND to GND
5. Connect BJT base terminal to D6 via 1K resistor
6. Emitter to GND
7. collector to -ve terminal of DC motor
8. Connect +ve terminal to 5V