denpo
Carburated Nihilist
In order to have my onboard computer nicely integrated, I need a device to smartly boot up/shut down the computer.
I design it based on an ATTiny microcontroller. 8 pins (1 gnd, 1 +5v, 6 I/O).
I'm using all the I/O pins, 3 input, 3 output
1 input to sense the car ACC +12v, to know if the car is on or not
1 input to sense motherboard +5v, to know if the computer is on or not
1 input to a switch to force the computer in off mode
1 output to a relay that simulates the motherboard on/off button
1 ouput to a relay that controls motherboard power supply
1 ouput to a realy that controls the optional amplifier power supplier (to avoid pop sound when the computer boots up)
I will connect a 3 state override button, with auto/always on/alway off mode.
So here is the current design, with single side PCB (that's a PITA to make)
I'm looking for any comment on the current design before I start etching a board.
I design it based on an ATTiny microcontroller. 8 pins (1 gnd, 1 +5v, 6 I/O).
I'm using all the I/O pins, 3 input, 3 output
1 input to sense the car ACC +12v, to know if the car is on or not
1 input to sense motherboard +5v, to know if the computer is on or not
1 input to a switch to force the computer in off mode
1 output to a relay that simulates the motherboard on/off button
1 ouput to a relay that controls motherboard power supply
1 ouput to a realy that controls the optional amplifier power supplier (to avoid pop sound when the computer boots up)
I will connect a 3 state override button, with auto/always on/alway off mode.
So here is the current design, with single side PCB (that's a PITA to make)
I'm looking for any comment on the current design before I start etching a board.
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