Project to deal with a misbehaving car radio. It drains the battery when off, and needs a timer and/or voltage based disconnect.
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My new car radio draws too much standby power and eventually drains the car battery when sitting for a week or two. This is a quick board to fix it.
It uses a P-Channel MOSFET to switch the power to the radio, so that it's only got power when the ACC power line is live, or the micro-controller (attiny85) keeps power going.
The attiny85 monitors the battery voltage and turns off the P-Channel MOSFET when the battery voltage drops below 11.75V (subject to be changed), or about 4 days has passed.
Once the P-Channel MOSFET has been turned off, it won't turn on again until the ACC line becomes live again. This will only happen when starting the car.
