Analog Input A3

[Robin]

Hello,
I use the Lambda Shield 2 in the Racingteam at our university to read and modify the lambda value.

My issue is, that I want to use the analog input pin A3 to read the throttle value but on this pin are 3.3V connected as seen in the schematics.
I can't use A4-5 because a DAC is connected on these pins.

So why I need to measure 3.3V or can I disconnect them?
Because I did not find anything in the code, that need these 3.3V.

I use the Arduino Uno and did not want to upgrade.

Sorry if my english is not perfect. :)

Best regards
Robin

[Christian_Bylund]

Hello,
I use the Lambda Shield 2 in the Racingteam at our university to read and modify the lambda value.

My issue is, that I want to use the analog input pin A3 to read the throttle value but on this pin are 3.3V connected as seen in the schematics.
I can't use A4-5 because a DAC is connected on these pins.

So why I need to measure 3.3V or can I disconnect them?
Because I did not find anything in the code, that need these 3.3V.

I use the Arduino Uno and did not want to upgrade.

Sorry if my english is not perfect. :)

Best regards
Robin

Hello Robin,

The 3.3V on A3 is used to detect a low 5V during testing of the boards. It is routed on the PCB between A3 and the 3.3V pin with a 100nF capacitor. The only way to use A3 is to remove the 3.3V pin.

Thank you.

[Robin]

Hello Christian,

thank you for the quick response to my issue.

Best regards
Robin