Guru
Joined: 05/03/2018
Location: NetherlandsPosts: 5879
| Posted: 12:27pm 08 Oct 2025 |
Analog design....
It won't get any simpler than this one.....
You enable the watchdog with
SETPIN GP27,DOUT
PIN(GP27)=0
You tickle the watchdog with
PULSE GP27,10 '10ms pulse
When the time is too short or long, change the 10uF capacitor.
The 10k resistor R2 is chosen so even with the bug in the RP2350 IO pins there is always a pullup on the GPxx pin (GP27 in this case). For the RP2040 (the zero) a 1 meg resistor R2 will be sufficient, lowering the current draw significant.
Volhout
Edited 2025-10-08 22:29 by Volhout