Arduino's Analog Inputs Not Providing Accurate Readings

[droidlocal]

I'm encountering an issue with my Arduino's analog inputs. When I connect a sensor to the analog pin and attempt to read its values, the readings I'm getting are not accurate or consistent. I've verified the sensor's specifications and made sure the connections are correct, but the readings still seem to be incorrect. I'm unsure if it's a problem with the Arduino board or if there's something I'm missing in my code. Any insights or suggestions on how to troubleshoot and resolve this issue would be greatly appreciated.

[Koepel]

Welcome to the forum.

The Arduino Uno has the ATmega328P microcontroller, which has a accurate 10-bit ADC. It has a good accuracy and linearity for those 10-bits, and often even more than that.

Can you tell which Arduino board you use and what you are trying to read ? A common problem is that the Arduino board does not measure a voltage, but it reads the input voltage relative to its reference voltage. For example reading a temperature from a LM35 sensor can be inaccurate. There are ways to increase the accuracy by using an other voltage if the 5V is not reliable.
Please show your sketch between code tags. The <code/> button is for code tags.
Which sensor is it ?

[pert]

I moved your topic to an appropriate forum category @droidlocal.

In the future, please take some time to pick the forum category that best suits the subject of your topic. There is an "About the _____ category" topic at the top of each category that explains its purpose.

This is an important part of responsible forum usage, as explained in the "How to get the best out of this forum" guide. The guide contains a lot of other useful information. Please read it.

Thanks in advance for your cooperation.

[Idahowalker]

Help us help you.

Please follow the advice given in this link How to get the best out of this forum when posting code, in particular the section entitled 'Posting code and common code problems'.

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a). Images of code suck.
b). Images of error messages suck.
c). Code snippets suck.

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

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

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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.

[jremington]

Please post a wiring diagram and a link to the sensor. Specify which Arduino you have.

The ADC requires that the input voltage source be a low impedance (less than 10K Ohms), for accurate measurements.

[johnerrington]

@droidlocal

When I connect a sensor to the analog pin and attempt to read its values, the readings I'm getting are not accurate or consistent.

Which arduino? which sensor (hint - post a link )
how do you know they arent accurate?

@droidlocal

I'm unsure if ... there's something I'm missing in my code.

Strangely so am I. Why dont you post it?