digital write pin issue

[gtv-racer]

Hello all,

I'm want to use a pm25 kit to control my HVAC.

Everything works fine untill i add a digital write pin.
Sensors stop reading.

What is wrong. I also put in some logic but deleted it to keep it simple. What is wrong with the digital pin? I put the digital pin in another program with a wait in it and cycle from 0 to 1 it just works fine.

[robski]

@gtv-racer said in digital write pin issue:

pm25 kit

is pin 18 not used for internal I2C/SPI?

[gtv-racer]

@robski

You are right. I now use pin 33. All sensors keep updating.
Now i have to built a relay cirquit for our 230volt net.

Thanks!