CCS811 sensor not working

RE: CCS811 sensor not working

Kapil Rawat — Sat, 13 May 2017 05:18:26 GMT

Hey, I'm facing the same problem. Have you found the solution?

awneil — Mon, 30 May 2016 10:02:49 GMT

The fact that those addresses differ by 1 suggests that they include the R/W bit ... ?

Quinn — Mon, 30 May 2016 09:50:39 GMT

I tested with (0x5A << 1), (0x5B << 1), 0x5A, 0x5B, (0x5A >> 1) and It's still error.

awneil — Mon, 30 May 2016 08:13:52 GMT

So are you using the correct one of those two?

Be careful that an I2C Slave Address is just 7 bits, but some people quote it as a byte - including the R/W bit ...

See www.avrfreaks.net/.../1872781 - starting from "The discrepancy between talking of I2C addresses as 7 or 8 bits is very common..."

Quinn — Mon, 30 May 2016 04:30:27 GMT

I used eclipse and Jlink to debug. I got Slave Address in data sheet, 0x5A or 0x5B.

awneil — Fri, 27 May 2016 06:30:23 GMT

So the CCS811 is either not (properly) connected to this bus, or is sending a NACK (Negative Acknowledge) when you try to communicate with it.

What debugging have you done to find the source of this problem?

Are you sure that you are sending the correct Slave Address?