Hello Werner, The Lambda Shield App is capable of showing a much higher voltage, lets see if we can figure out what is wrong. It would be good to know if you are using the original Lambda Shield or Lambda Shield 2? Is it possible for you to email a screenshot of the Lambda Shield app when it is beha...

It appears it was an issue with the additions to the code I made I went back uploaded the original gui code again and it appears to run fine and is working on all 3 unos. Great you found the problem. Check your code for memory use and access of shared peripheral, this is typically the cause for cra...

Hello.

Could you please share a picture of your setup to see what is connected where, you mention that you have a display connected for example. Does the GUI code work without anything but the shield connected?

Thank you.

Hi Fabio, With the NOx shield is it possible to measure the two variables by Arduino? both Nox and O2 ? Yes it can measure both O2 as the Lambda Shield but also NOx for lean gases with excess of oxygen. Do you have a CO (carbon monoxide) measurement shield? Sorry, no. I already have a shield for mea...

Glad you got it working.

There is some information about this in the Troubleshooting Section. Under point 5.

Thank you for your suggestions Chris!

Hi Tomaso,

I think trying to use any MKR board with a UNO-style shield is possible but not feasible.

Regarding I2C displays. For UNO boards you can solder the cables directly to the shield. On Arduino Mega you can use the extra I2C pins.

kevin wrote: ↑

01 Sep 2021 15:39

sorry forgfet to mention the oscilatoor is also 8Mhz ;)

Sorry, we do not support custom designs on this forum. But it seems your DSP is not initialized properly.

kevin wrote: ↑

01 Sep 2021 15:25

Hello Christian,

I'm getting very phantom readings, nothing connected to the inputs but spikes up to 100% on both channels...
What can cause this behaviour?

I just used an 8Mhz prescaler:

Hi Kevin,

The prescalar need to match the oscillator which is 6MHz.

Hello Markus, Basically no NOx sensors from cars will work as they are most certainly proprietary to avoid interchangeable spare parts. SAE J1939 is a standardized protocol for sensors and is supported by most commercial vehicles, unfortunately these sensors are 24V. We sell these on our website . T...