Analog inputs RP 2040

[Maverick11]

Can someone please point me in the right direction. I cannot get the rp2040 to display ADC values, it shows 10-15. I'm new to programing just wanting to see voltage on A2 or A3. So far I've been about to print messages, send constant int to IoT cloud. When I apply 2vdc on any input of rp2040 nothing changes. I use my same setup on UNO it works.

Thanks in advance.

[Grumpy_Mike]

A screen shot of code is useless. please post all your code in the correct way.
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A RP 2040 only has 3 useable A/D inputs A0 to A2, there is no A3. Have you tried using the GPIO numbers here GP 26, 27 and 28?

[srnet]

analogReadResolution(12);    //set for 12 bit
volts = analogRead(28);          //ADC2

Worked for me yesterday when using the earlephilhower core on a Pi Pico;

GitHub - earlephilhower/arduino-pico: Raspberry Pi Pico Arduino core, for all RP2040 boards.

[Maverick11]

Thanks for the help guys, I ended up reinstalling earlephilhower core and it worked!

[alex_chavira]

I want to read the internal temperature but I don´t know how to refer channel 4 for RP2040...

[oqibidipo]

The earlephilhower core has float analogReadTemp() which gives the temperature in degrees Celsius.