Trying to integrate an SPS30

Components
#1

I’m not sure this is allowed here because it deviates from the default hardware configuration but I’m stumped and hoping someone with more of a background can help.

I’m trying to integrate the SPS30 sensor in place of the PMS5003. I’ve read all about pull-up resistors and designed and built the below but I’m getting what I think is an i2c bus conflict. U4 below is a header that connects to the SPS30. It may also have something to do with my limited understanding of pull-up resistors. Can anybody offer me any guidance?

My results are as follows:

[sps30:091]: Unable to read sensor firmware version
I get garbled text on the OLED
The sensor seems to get abnormally hot (resistor issue?)

image
image1231×1086 175 KB

#2

The PMS5003 uses UART and not I2C. So if you like to run the SPS over I2C you would need to connect it tp SDA/SCL ports, e.g. on the top left. But you need to check the voltage requirements.

#3

Yep, I managed to get that far and I think my PCB reflects the correct connections. Still no joy.

#4

Is the SPS looking for 5v or 3.3v? Are you reusing the Temp header now, or how are you connecting it to the I2C?

#5

according to the datasheet it’s 5v. I’ve connected it to I2C by way of a JST header. I think my issue is with the way i have the pull-up resistors connected to the SDA/SCL pins and my lack of understanding of how that should be connected.

#6

I don’t have much experience with the SPS. But did you try and see if the SPS works without the other sensor modules connected?