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Relays activate at startup
Posted: 26 May 2023, 23:18
by RaphV57
Hello,
I'm controlling a fan speed with double relay board and capacitors. When the wemos boot, the two relay are briefly activated. Have a look at my
video to better understand.
Is there a way to avoid it?
Schematic
Re: Relays activate at startup
Posted: 26 May 2023, 23:27
by TD-er
See "GPIO Behavior Summary" on this page:
https://rabbithole.wwwdotorg.org/2017/0 ... -gpio.html
And the table on this page:
https://lastminuteengineers.com/esp8266 ... reference/
Of course this page should be your first reference when picking pins to use
https://espeasy.readthedocs.io/en/lates ... on-esp8266
The only ones which are safe to use are GPIO 5 & 4 (D1/D2)
Second best are GPIO 14/12/13 (D5/D6/D7)
Re: Relays activate at startup
Posted: 27 May 2023, 07:22
by RaphV57
Thank you!
I got tricked once again with this GPIO selection...
Re: Relays activate at startup
Posted: 27 May 2023, 13:17
by TD-er
RaphV57 wrote: ↑27 May 2023, 07:22
Thank you!
I got tricked once again with this GPIO selection...
Happens to me all the time, that's why I created that table in the docs