PULL UP Resistors on I2C
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lloydrichards commented
Currently, there are two 10K ohm resistors on the SDA and SCK lines. While this might not be an issue with fewer I2C slaves, this might be a root issue for things like the CCS811 not working correctly. Recommend to increase the resistance to 100K to test out the effect on the signal. Would also need to research how best to calculate the overall resistance and optimize it overall.