DIY basic kit - SHT init failed

[aprotopopov]

I’ve soldered DIY basic kit v4 by following instructions: The AirGradient DIY Air Quality Sensor (Basic Version PCB Version 4.0+)

Although I haven’t flashed prior to connecting all the pieces and done it at the end.

Once flashed via Webbrowser - got from logs: “SHT init failed”.

Then Installed Arduino IDE, tried flashing there - same error. Removed SHT sensor and commented the code - then got “SenseAirS8 init failed”.

After that decided unsolder D1 mini flash it and solder back, but introduced some additional mess.

Question - it seems I’ve getting error due to board initialization - does it mean I connected something wrong? What is the way to debug it?

First soldering experience - thought it’s going well until tried to flash and switch it on.

Photos attached (thanks Achim):

[Achim_AirGradient]

Can you please try again to post photos?

[aprotopopov]

@Achim_AirGradient updated the post, thanks.

[mascot1579]

Not sure if it’s relevant, but prior to desoldering the D1 Mini, did the PM sensor and OLED display work? And did it connect to wifi?

I also had to learn the hard way not to solder things immediately to the board, because the D1 Mini v4 that I bought (not from the AG store) had defective wifi. So now, prior to soldering, I plug everything into a breadboard to test things out.

If you have some dupont cables (male to female), you can remove the OLED and connect the SHT/S8 using those?

[aprotopopov]

Nothing was working and in logs I only got the message “SHT init failed”. When I commented that got “S8 failed”. Since it’s happening on boardInit() stage link I thought that something may be wrong completely - https://github.com/airgradienthq/arduino/blob/master/examples/BASIC_v4/BASIC_v4.ino#L492-L501.

I’ll still try to debug further - just was curious whether someone had a similar experience and what is the usual way of debugging since don’t have much experience with hardware.

But have picocom connection and Arduino IDE set up - will do try/error one. I wonder whether there is a separate example to init only D1 mini to make sure MCU is working as expected

[Achim_AirGradient]

Could you paste here all the logs you get after powering on the monitor? It might give some indication of the issue.

[aprotopopov]

What is the way to get logs on boot?

I tried getting logs via picocom and “Flash firmware” → “Logs & Console”, but I only see “SHT init failed”. When I disconnect - all connections interrupting. JustPaste.it - Share Text & Images the Easy Way

I tried manually pressing RST button on D1 mini, but it’s some unreadable binary printed - JustPaste.it - Share Text & Images the Easy Way.

I may go with Arduino prints, but I believe there should be a better way. Not sure whether breakpoints are available there.

[Mr_Cups]

I had issue with the sht myself, but I had the init failed only with the sensor not properly making contact.
On side note for me the latest library won’t work with the sht3x, I had to downgrade to the previous one, otherwise the output of the sensor would be something like 0 -255

[Achim_AirGradient]

I am already testing the updated firmware that supports SHT30 (and SHT40). I hope we can publish sometime this week.

It is true that the SHT needs good contact with the board. So also worth checking the soldering.

[aprotopopov]

I guess in my case it’s not only about SHT4x since when I disabled the code of initializing it - it started to print failures to initialized S8 sensor: “SenseAirS8 init failed”.

I may try downgrading the firmware though. @Mr_Cups what firmware version have you used?

[Mr_Cups]

AirGradient Air Quality Sensor 2.4.15