Analog Input A3

Support forum for the Lambda Shield designed to connect Bosch LSU 4.9 wideband oxygen sensors to Arduino projects.
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Robin
Posts: 2
Joined: 06 Jul 2021 16:24

Analog Input A3

Post by Robin » 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

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Christian_Bylund
Posts: 255
Joined: 07 Mar 2015 18:09

Re: Analog Input A3

Post by Christian_Bylund » 07 Jul 2021 07:23

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.
Best Regards,
Christian Bylund
Bylund Automotive AB

Robin
Posts: 2
Joined: 06 Jul 2021 16:24

Re: Analog Input A3

Post by Robin » 07 Jul 2021 10:38

Hello Christian,

thank you for the quick response to my issue.

Best regards
Robin

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