I2c is not detectable on Rpi 400 or Rpi 4 but is with Rpi 3s

Hardware
1

I is there some thing that I am missing? I am having a bugger of a time getting i2cdetect -y 1 to find anything on raspberry pi 4s or 400s

Dave

2

Hi.

Make sure you have enabled the I2C option in the raspi-config menu.

It it isn't enabled there, you are not going to get anywhere I feel.

Sorry if you have done it, but it is better to state the bleeding obvious than not. :wink:

1 Like
3

I did do that several times. You are correct to master the obvious first. The pi 400 magically started up last night (i2c) I It took several reboots.

Dave

4

I'd suspect a loose connection somewhere could be causing your issue

1 Like
5

Like @cymplecy said or have you forgotten the pull - up resistor?

6

The Pi has built in pull-ups on the i2c pins

7

Yep, should have remembered that!

8

The Rpi 400 detected the i2c BUS as soon as I did full upgrade and then upgraded to --node16 Node-RED. Don't ask me why. I am just happy to be back online. I am going to hold off on Bullseye and "OS Legacy" as long as my current Buster revs are doing what I need on my hardware. Too many fish to fry at the moment.

Dave

2 Likes
9

Good to hear all is now good. :slight_smile:

10

I have several PiZero running Jessie and very old NR versions :slight_smile:
They do the job I need them to and I leave them alone :slight_smile:

1 Like
11

This topic was automatically closed 14 days after the last reply. New replies are no longer allowed.