This idea is to cut power to a dashcam when a specific battery voltage is reached. The method is to select an appropriate Zener of about 12.2-12.4V and use it to switch a MOSFET supplying power to a 5V buck converter thence to the dashcam. I am pretty sure I could squeeze this into a cigarette lighter 5V adapter. I would use a logic level MOSFET so an appropriate resistor would be needed between the Zener and the gate.
I do have an alternative plan of using an Attiny 85 to switch the MOSFET but I was hoping to be as simple as possible.
Any comments most welcome, even "that's a dumb idea" if it is !
I do have an alternative plan of using an Attiny 85 to switch the MOSFET but I was hoping to be as simple as possible.
Any comments most welcome, even "that's a dumb idea" if it is !