Analog input

Other Hardware Sensors
1

Hello guys,
I'm having problems with analog IN using UNO.

My project is solar tracker and small battery charger (using LM 2574 to bring down the voltage from solar panel).
I'm not using any light sensors LDRs or so, I'm trying to track the voltage from solar panel (connecting it in parallel to analog A2) and the code does the job according to voltage coming from the panel.

The issue starts when i realized that Analog IN is giving 1.65 v out !!! and that comes to the entire circuit killing my voltage/current and so my LM2574 can not charge the batteries :0

Since my input Voltage from panel was ~4.5v before I was trying to track it with analog input, it is now ~ 2.4v and LM2574 is not producing any output and not charging 2 AAA batteries.

Is it possible to get rid of those 1.65V somehow, so I can both track and charge?

Thanks.

2

So no code and no schematic and the statement:-

Analog IN is giving 1.65 v out

Which would only be true if you had blown up the pin or you had enable the internal pull up resistor.
Hard to be of more help with so little information.

3

Do you have a multimeter ?

Disconnected everything and test and measure all the parts.
Is the Arduino still running when connected to the computer ? Can you measure an analog voltage with it ?
You can use a protection resistor to an analog input of the Arduino of about 4k7.

4

Thanks guys, yeah the A2 is gone :P, doesn't work properly only tracks ranges from ~4.3 to 5v.

Got damaged a little bit, it's good I have more inputs, but this time I will be more careful !!

Thank You.

5

The analog port is multiplexed in the UNO so you probably have lost all your analog ports...