Env Combo from Qwiic Pi Starter Kit Issues

Qwiic System
1

Hi, I’m following the guide here:

https://learn.sparkfun.com/tutorials/qw … okup-guide

I have no issues with the prox sensor or OLED display but the environmental combo is giving me trouble with the sample code. I’m wondering if I have made a hookup error or maybe the hardware is bad?

When I connect only the prox and display and run “i2cdetect -y 1” I see those two devices in the grid:

pi@raspberrypi:~ $ i2cdetect -y 1

0 1 2 3 4 5 6 7 8 9 a b c d e f

00: – – – – – – – – – – – – –

10: – – – – – – – – – – – – – – – –

20: – – – – – – – – – – – – – – – –

30: – – – – – – – – – – – – – 3d – –

40: – – – – – – – – – – – – – – – –

50: – – – – – – – – – – – – – – – –

60: 60 – – – – – – – – – – – – – – –

70: – – – – – – – –

With the addition of the env combo, or running only the env combo connected, the grid nulls out:

0 1 2 3 4 5 6 7 8 9 a b c d e f

00: – – – – – – – – – – – – –

10: – – – – – – – – – – – – – – – –

20: – – – – – – – – – – – – – – – –

30: – – – – – – – – – – – – – – – –

40: – – – – – – – – – – – – – – – –

50: – – – – – – – – – – – – – – – –

60: – – – – – – – – – – – – – – – –

70: – – – – – – – –

This is a Pi 3 b+ with current patches, clock stretching enabled to 10000 per the hookup guide. The other day I was getting all the columns filled in like the below:

Screen Shot 2021-10-03 at 2.29.00 PM.png
Screen Shot 2021-10-03 at 2.29.00 PM.png762×294 92.7 KB

I’m able to run the sample python code if I comment out all the BME and CCS related content. The prox sensor and display work fine. If I include the env sensor code I just get errors initializing because it can’t find the hardware.

Any troubleshooting help would be appreciated, thanks!

2

It could be a bad cable or connector.

  1. Try adding the BME280/CCS811 board at the end of the daisy chain. If it is a bad connector or cable, it should isolate the issue from the OLED and proximity sensor being able to respond with the i2cdetect command.

  2. Try the i2cdetect command again, if you see the OLED and proximity sensor respond, but not the env. sensor… that probably means there’s a bad cable or connector.

  3. Try the opposite connector and try swapping cables until you isolate and can confirm if it is a cable or connector. (i.e. test with a know working cable on connectors to verify that it isn’t able issue)