# Processing and Arduino: how to change color according to the status of a digital input?
**URL:** https://discourse.processing.org/t/processing-and-arduino-how-to-change-color-according-to-the-status-of-a-digital-input/37579
**Category:** Electronics (Arduino, etc.)
**Created:** [June 16, 2022, 2:13pm UTC](https://discourse.processing.org/t/processing-and-arduino-how-to-change-color-according-to-the-status-of-a-digital-input/37579 "2022-06-16T14:13:14Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@samiam85](https://discourse.processing.org/u/samiam85)
#### Post date: [June 16, 2022, 2:13pm UTC](https://discourse.processing.org/t/processing-and-arduino-how-to-change-color-according-to-the-status-of-a-digital-input/37579/1 "2022-06-16T14:13:14Z")
Dear All,
I am new in the “Processing world”. I have connected Processing to Arduino.
What I can do, it is to push a button and activate some Digital Outputs in Arduino.
Now, what I wanna do is: according to the status of an output, how I can “color” a certain square in processing? Let’s say, like a led?
Thanks a lot,
Samuele
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### Author:  [@glv](https://discourse.processing.org/u/glv)
#### Post date: [June 16, 2022, 2:28pm UTC](https://discourse.processing.org/t/processing-and-arduino-how-to-change-color-according-to-the-status-of-a-digital-input/37579/2 "2022-06-16T14:28:03Z")
Hello @samiam85,
There is a tutorial on Electronics here suitable for a beginner:
> **[Welcome to Processing!](https://processing.org/)**
>
> Processing is a flexible software sketchbook and a language for learning how to code within the context of the visual arts. Since 2001, Processing has promoted software literacy within the visual arts…
Explore away!
`:)`
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### Author:  [@RichardDL](https://discourse.processing.org/u/RichardDL)
#### Post date: [June 16, 2022, 3:05pm UTC](https://discourse.processing.org/t/processing-and-arduino-how-to-change-color-according-to-the-status-of-a-digital-input/37579/3 "2022-06-16T15:05:14Z")
As well as that, see (Processing) File, Examples, Libraries, Serial. Try all 5 examples starting with SimpleRead and SimpleWrite.
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### Author:  [@glv](https://discourse.processing.org/u/glv)
#### Post date: [June 16, 2022, 5:27pm UTC](https://discourse.processing.org/t/processing-and-arduino-how-to-change-color-according-to-the-status-of-a-digital-input/37579/4 "2022-06-16T17:27:51Z")
Hello,
If you are exploring the examples that come with the Processing IDE take a look at this topic:
> [@Processing to Arduino Serial Library Example](https://discourse.processing.org/t/processing-to-arduino-serial-library-example/11143/5):
>
> I modified the existing “SimpleWrite” example to: save and check for the state of mouseOverRect() print state to console only writes serial data once a delay() to wait for Arduino to reset once connected to it; in my case, it is an Arduino Mega 2560 R3. I kept the spirit of the original example intact and left it as a “Simple Write” program. My edit of “SimpleWrite” example so it only sends data once: /\*\* \* Simple Write. \* \* Check if the mouse is over a rectangle and writes the status …
`:)`
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### Author:  [@samiam85](https://discourse.processing.org/u/samiam85)
#### Post date: [June 17, 2022, 6:10am UTC](https://discourse.processing.org/t/processing-and-arduino-how-to-change-color-according-to-the-status-of-a-digital-input/37579/5 "2022-06-17T06:10:45Z")
> [@glv](#):
>
> a tutorial on E
Dear All,
thanks a lot for your replies. I’ll go trhough the tutorials, then and I’ll be back to you, if necessary.
Samuele.