Hi. I have a project with a Wemos D1 mini and a 4-channel relay module with optocouplers. I only use 3 of the relays in the module, and on startup, two of them are on HIGH, even though I've set them on low in the setup: void setup() { Serial.begin(115200); pinMode(luz_balcon, OUTPUT); pinMode…

Wemos D1 mini pins on HIGH on startup

Assamita November 18, 2021, 11:37am 9

I've found the issue. It was a code issue. Since I'm using pull-up inputs, I had the behaviour of the switches the other way around.

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