So I ordered 2 arduino uno r3s and a lot of components from aliexpress and so far have 1x arduino, 1x 12v water pump and jumpers (relays are coming soon).
In my impatience I am trying to run the pump on and off using those parts and a 9v battery
My issue is that digitalWrite(motorPin, LOW); is slowing the pump but not stopping it
The setup is as follows:
Uno A1 -> + pump
- pump -> - 9v battery
- 9v battery -> Uno GND
pretty surprised I have not blown it up already
Can I make it shut off the pump completely or do I have to wait for the relay?