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Analog Input A3

Posted: 06 Jul 2021 16:51
by 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

Re: Analog Input A3

Posted: 07 Jul 2021 07:23
by Christian_Bylund
Robin wrote:
06 Jul 2021 16:51
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.

Re: Analog Input A3

Posted: 07 Jul 2021 10:38
by Robin
Hello Christian,

thank you for the quick response to my issue.

Best regards
Robin