<![CDATA[M5 stack pin 21/22 (sda/scl) behaviour]]>

<![CDATA[M5 stack pin 21/22 (sda/scl) behaviour]]>Hi.

I am trying to use this as normal inputs.
I have a square wave signal input, and if the signal is present during boot I cannot read it.
If I boot with nothing connected, I can connect and it works like expected.
Is there some special behavior on this pins if they are high or low at boot?

]]>https://community.m5stack.com/topic/2192/m5-stack-pin-21-22-sda-scl-behaviourRSS for NodeWed, 29 Apr 2026 10:39:37 GMTMon, 10 Aug 2020 12:25:00 GMT60<![CDATA[Reply to M5 stack pin 21/22 (sda/scl) behaviour on Mon, 10 Aug 2020 13:55:31 GMT]]>So if anyone else stumbles upon this...

I had M5.powerbegin() in my code, and that will of course enable i2c, so that's the reason for my issues.

]]>https://community.m5stack.com/post/9617https://community.m5stack.com/post/9617Mon, 10 Aug 2020 13:55:31 GMT