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relay with timer and thermistor


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toyotaguy 
Member - Posts: 22
Member spacespace
Joined: July 06, 2013
Posted: July 28, 2015 at 8:03 AM / IP Logged Link to Post Post Reply Quote toyotaguy
I picked this back up after a year on the shelf... It's prototyped and works fine on the breadboard. The only problem is that I am sometimes able to hang the ATtiny if I switch the ACC pin on and off numerous successive times in a random and rapid way. In other words I can get the MCU to freeze with the pin (PB4 in the diagram) still set HIGH. (Q1 and T3 closed). The scope detects the pin change but the MCU doesn't respond. This should never happen in normal use and I'm not sure I could duplicate it using a real key and ignition switch, but I don't like that it is possible. The only way to recover is to reset or disconnect the battery.
I have included no other components on the power supply apart from the required caps and a diode. If you think it would be advisable to add anything else (e.g., varistor, inductor, etc.) what would you add and what value? I am attempting to minimize part count and cost but if it's prudent, then it's prudent.
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