unixcommando
Posts: 16
Joined: Sun Dec 04, 2016 6:08 pm

MPR121 on Pi 3B

Sat Mar 25, 2017 9:13 pm

Greetings,

Has anyone been successful in getting an MRP121 to work with the Pi 3b? I didn't read the fine print when I ordered it and just assumed it would work with the 3b, but so far no luck, I get an error that it can't find /dev/i2c1 which is true as no such device exists. I've found some pages that suggest modifying /boot/config.txt, /boot/cmdline.txt and /etc/modules-load.d/raspberrypi.conf, however since none of these exist in /boot I'm wondering if this is the correct method for the 3b.

Any help would be appreciated.

Thanks
-Bob

unixcommando
Posts: 16
Joined: Sun Dec 04, 2016 6:08 pm

Re: MPR121 on Pi 3B

Sat Mar 25, 2017 11:24 pm

Thanks to those who looked at my post, even though nobody replied. I was able to solve this on my own.

The tutorial for the MPR121 overlooks a step. The missing step is to enable i2c which is performed via raspi-config. Once I enabled i2c and rebooted the MPR121 responds as expected.

-Bob

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