Hi @domene, I just fixed it:

The Wifi module was replaced, there’s a new VOC sensor as a little bonus, and the firmware was also upgraded to the latest version. The PM2.5 sensor has also been replaced with a new one.

Will ship it back to you soon,

Radu

Hi Sam, for lowering the frequency there are no issues other than entering the audible spectrum. I can confirm your results here.

Please note that the voltage regulator algorithm thinks that with increased duty cycle there comes increased voltage. If you’re seeing serious swings you might need to change it.

The tubes well shielded by design in regards to RF, but the counter circuit (PCB traces, components) are not. But I don’t think the high voltage inverter is of concern here.

Having two units is definitely the way to go here, and try to get the Ethernet running so you can automate the process.

Good luck!
Radu

Hi @Sam,

Indeed the MPSA42 and the 2.2mH inductor are critical in terms of quality. But I wouldn’t blame the Chinese channels. After all, everything is made there, just be careful when you select the goods and the provider.

Please increase R1 from 100 to 1K and R2 to 47K.

What duty cycle does this give you? NExt try to change the frequency, in inverter.h, in the code. Try to reduce it by 1kHz until down to 10kHz. What do you see?

Here’s a nice chart I made from a similar circuit: https://www.pocketmagic.net/global-radiation-monitoring-network/#131005

Please try the new firmware I sent you before anything else.

Hello,

The country code has been updated for all your three units,

You can see the data in real time on:
https://www.uradmonitor.com/tools/dashboard-04/?open=14000020
https://www.uradmonitor.com/tools/dashboard-04/?open=14000021
https://www.uradmonitor.com/tools/dashboard-04/?open=820000A8

To access the data stream, please see the tutorials on http://www.uradmonitor.com/dashboard . You need to be logged in to your account.

No problem. Can you run a few tests on a different network?

Thanks for your help on this @Wolferl,

It is possible the tube goes into oscillation due to a misbehaving capacitor, called “the compensation capacitor”. Normally all A3 units have it set for 150pF, linked on the type of Geiger tube used (SI29BG), but in this case the value should be bigger to prevent these oscillations that result in high counts.

Either this, or the tube is faulty going in avalanche (unlikely).

You can either send the unit back so I can have a look at it, or change the capacitor yourself based on my indications. I’ll be happy to accommodate any of the two options.

I agree with Bjorn, the http status code should be 200 . Without that, the watchdog will keep on rebooting your unit.
The next two numbers show the successful packets sent per the total packets sent.