<![CDATA[digital write pin issue]]>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.

94f6f469-b47a-4bb1-a817-1dbc30033612-image.png

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.

17947ccf-a7ce-42c0-b75e-42344d0c034e-image.png

]]>https://community.m5stack.com/topic/8073/digital-write-pin-issueRSS for NodeWed, 29 Apr 2026 07:49:43 GMTMon, 09 Feb 2026 18:36:35 GMT60<![CDATA[Reply to digital write pin issue on Tue, 10 Feb 2026 13:43:35 GMT]]>@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!

]]>https://community.m5stack.com/post/30623https://community.m5stack.com/post/30623Tue, 10 Feb 2026 13:43:35 GMT<![CDATA[Reply to digital write pin issue on Tue, 10 Feb 2026 11:47:49 GMT]]>@gtv-racer said in digital write pin issue:

pm25 kit

is pin 18 not used for internal I2C/SPI?

]]>https://community.m5stack.com/post/30621https://community.m5stack.com/post/30621Tue, 10 Feb 2026 11:47:49 GMT