SOLVED: System RESET works, sort of

[Demon]

Solved: see post #5:

https://www.picbasic.co.uk/forum/sho...426#post156426

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This works fine if I press it for nearly 1 second.




But the LCDs display garbage if I press it quickly.

I was hoping to get away from using a 555 timer and an inverter to trigger the mosfet.

(yes, I had both ICs wired, and then I took it apart thinking I had found a shortcut, which isn't working as well as expected)


EDIT: This guy just gave me an idea to try:

https://electronics.stackexchange.com/a/322184

[Ioannis]

Maybe you just need a cap in parallel of the button and a diode in parallel with the resistor, cathode to +Vdd. 10uF would be a good start.

Ioannis

[Demon]

Maybe you just need a cap in parallel of the button and a diode in parallel with the resistor, cathode to +Vdd. 10uF would be a good start.

Ioannis

Nope, no difference.

[Demon]

I tried this guy's idea of a RC delay on the mosfet.

https://electronics.stackexchange.co.../322184#322184


I tried with 10uF and all the way up to 1M (both to VDD like that link), no difference. I didn't even get a delay.

[Demon]

GOT IT! Reinstalled the 555 timer with 7404 inverter.

I had to up the capacitor to 100uF. Works beautifully with 10K.

Just over a second (by eye), so now I can blip the button and reset is complete.

[Demon]

[Ioannis]

Nope, no difference.

I tried this guy's idea of a RC delay on the mosfet.

https://electronics.stackexchange.co.../322184#322184


I tried with 10uF and all the way up to 1M (both to VDD like that link), no difference. I didn't even get a delay.

How can that be true? I really cannot understand... A simple cap with a resistor will give the required RC delay. And if you want to quickly reset again, the diode, reverse biased in parallel with the resistor will rapid discharge the cap, even if it is big enough.

Don't get it why it failed...

Ioannis