Wrong reading of voltage by analog pin

[jeeban_jyoti_behera]

I made a circuit to measure voltage across a resistor. Drawing 5v from arduino 5v pin, Connected it to two 1kΩ resistor in series. It should read 2.5v across the resistor or something near to that but it read 0.09 volts. I tried changing the resistor but still got the same
This is my code and circuit

[groundFungus]

Screenshots of code are nearly wortless. Read the how to get the best from the forum post to see instructions on how to post code and ask a question.

A hand drawn, photographed and posted schematic would be more helpful than a photo.

[westfw]

do NOT do pinMode(readPin, OUTPUT);

[madmark2150]

Does your voltmeter show ~2.5V at the analog in?

[hammy]

Just run the analog input example code , lots wrong with I can see in your code ..
The two resistors wired in series - one end to 5v , centre to analog pin , other end to 0v .

[johnerrington]

@groundFungus

A hand drawn, photographed and posted schematic would be more helpful than a photo.

How to make a schematic you can post.

When you submit a question on the forum you will usually need to add a schematic (circuit diagram). The tutorial that follows will explain some ways to create a useful image; however lets start by explaining how to add the image to your post. Its easy. Having created the image all you need to do is : Save the image somewhere convenient - maybe your desktop Start your post, and place the cursor (insertion point) where you want the image to be shown; [upload image to forum] 3: click th…

In the IDE Edit - copy for forum

then post your code.

[Idahowalker]

Help us help you.

Please follow the advice given in the link below when posting code, in particular the section entitled 'Posting code and common code problems'

Images of code suck.

Use code tags (the </> icon above the compose window) to make it easier to read and copy for examination

How to get the best out of this forum

Use the IDE autoformat tool (ctrl-t or Tools, Auto format) before posting code in code tags.

Images of error messages suck.

Code snippets suck.

Include the entire error message. It is easy to do. There is a button (lower right of the IDE window) called "copy error message". Copy the error and paste into a post in code tags. Paraphrasing the error message leaves out important information.

Post a schematic.

Post an image of your project.

Which Micro Controller are you using?

Is this simulator code?

Please describe the problem better then you just did.

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[alto777]

@hammy

lots wrong with I can see in your code ..

What code?

I thought you were being sarcastic, just predicting that the code is a nightmare or something, then I noticed the pictures of the monitor with some text and it looks like code, like when they show it on CSI or NCIS just there as decoration, scrolling up gently or not, you can tell it's code by the Autoformat format that it is in that hackers always are careful to use (IDE Tools menu BTW) and sometimes these days freeze it and see it is! Maybe real code.

Is that the code you all are talking about?

a7

[robertnc]

It's hard to tell what you are doing from what you have posted, but since you changed the resistor and got the same value you are probably measuring on the low side which is basically measuring ground.

[jeeban_jyoti_behera]

Thanks y'all for helping!!!. Seems like I set A1 as output instead of output. Now it works. And yes I will take care abour how to post a problem here. Actually i'm new to this forum, so i didn't know about it before.

[hammy]

@alto777

I thought you were being sarcastic, just predicting that the code is a nightmare or something, then I noticed the pictures of the monitor with some text

In your post you say this is your code…

Quote” tried changing the resistor but still got the same
This is my code and circuit“