i2c Raspberry pi4 with LCD Display not detected

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loonhaunt
 
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Joined: Sat Nov 16, 2013 1:40 am

i2c Raspberry pi4 with LCD Display not detected

Post by loonhaunt »

Hello,

I think a barbecued my i2c interface on my Rpi4. I spent hours trying figure out why I could not i2cdetect -y my LCD display, I had one other LCD display with the PCF 8574 chip on the backside and could not detect that either. So plugged the LCD into one of my rpi 3's and detected the at 00x27 just like it should. So my question is thus, is the issue with the rpi 4 hardware or some OS thing? ic2 smbus or whatever, and what can I do to determine if this is hard or soft issue?

Dave

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loonhaunt
 
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Re: i2c Raspberry pi4 with LCD Display not detected

Post by loonhaunt »

I am posting to my own topic, but.... I have a Rpi 400 and Rpi 4 that I am unable to detect i2c bus anywhere?
Has anyone else had this this issue? I have full upgraded everything, and have the interface enabled for i2c

Appreciate the input in advance

Dave

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rpiloverbd
 
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Re: i2c Raspberry pi4 with LCD Display not detected

Post by rpiloverbd »

Have you checked the interfacing option? Most of the time it happens when the I2C interface is disabled.

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adafruit_support_carter
 
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Re: i2c Raspberry pi4 with LCD Display not detected

Post by adafruit_support_carter »

You do need to enable the I2C bus to have it show up. If you've done that and still are not seeing it - can you elaborate on what "unable to detect" means?

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