Co2 reading of -3 constantly

Components
#21

Ok I haven’t got round to soldering the co2 sensor to the board yet as I think the pins are tight enough to give a reading however now that I think of it that could be the problem so I’ll try to solder and get a picture on monday for you thanks.

#24

image
image1920×1440 213 KB

You really need to solder all connections (see red). Also cut the cables hanging out (blue).

#25

I would say there’s a good chance you’ve shorted pins and permanently damaged parts already.

#26

Yepp, it looks like you’ve already shorted TX/RX pins on your PMS5003 slot as mentioned by @ken830 , which actually can directly affect D6 pin of MC if you have the same version of the board as I have. try cleaning out and testing again. I’d even de-solder everything and test components on a breadboard for debugging

#27

@Achim_AirGradient Thank you for sending me the D1 mini replacment board (for my presoldered PCB 4.2). I was able to flash it. Unfortunately the CO2 sensor only reports “-3”. Does this mean the senseair device is potentially defective as well? The sensor light flashes in normal intervals.

Thanks,
Helge

1000062811
10000628111536×2048 145 KB

#28

Please send some pictures of the board and the assembly. If possible both sides of the pcb. Thanks.

#29

@Achim_AirGradient I hope these photos are sufficient. If I recall right the pcb had already been mounted to the plastic enclosure when it was shipped to me but if needed I can of course also remove it from its lower body part.

I didn’t mention in my previous post that I didn’t touch any of the boards mounted on the pcb except the D1 mini which I have replaced, so the boards that had been working well before the replacement of the D1 mini I have not removed and installed on the pcb again.

Maybe also important to mention: I made sure that the power supply is from a strong usb power source (100W, not needed of course but just to make sure that sufficient energy supply is ensured.

I also wanted to share a video showing the orange senseair sensor measurement light blinking but couldn’t upload it here. Of course it’s no problem to upload it to a fileshare and provide a link in case you’d be interested in this as well.

IMG20231016005557
IMG202310160055571536×2048 337 KB

IMG20231016005629
IMG202310160056291536×2048 233 KB

IMG20231016005656
IMG202310160056561536×2048 256 KB

Thanks,
Helge

#30

Thanks. I don’t see a problem. Please contact our support for a replacement.

#31

Thanks @Achim_AirGradient I will do so.