# Is this how motion sensors work?
**URL:** https://discourse.processing.org/t/is-this-how-motion-sensors-work/31792
**Category:** Libraries
**Created:** [August 19, 2021, 4:34pm UTC](https://discourse.processing.org/t/is-this-how-motion-sensors-work/31792 "2021-08-19T16:34:16Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@MoonAlien822](https://discourse.processing.org/u/MoonAlien822)
#### Post date: [August 19, 2021, 4:34pm UTC](https://discourse.processing.org/t/is-this-how-motion-sensors-work/31792/1 "2021-08-19T16:34:16Z")
```auto
color[] firstframe;
color[] secondframe;
int i= 1;
int x;
int y;
void draw(){
firstframe[i]=get(x,y);
delay(500);
secondframe[i]=get(x,y);
if (firstframe[i]==secondframe[i]){
i++;
y++;
if(y==1920){x++; y=1;}
}
if(firstframe[i]!=secondframe[i]{
print("motion detected");}
}
```
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### Author:  [@micuat](https://discourse.processing.org/u/micuat)
#### Post date: [August 19, 2021, 8:16pm UTC](https://discourse.processing.org/t/is-this-how-motion-sensors-work/31792/2 "2021-08-19T20:16:53Z")
Hi! It would be great if you can add text to describe what you want to do. What do you mean by motion sensor? Is it a camera? Which platform are you using?
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### Author:  [@MoonAlien822](https://discourse.processing.org/u/MoonAlien822)
#### Post date: [August 19, 2021, 8:26pm UTC](https://discourse.processing.org/t/is-this-how-motion-sensors-work/31792/3 "2021-08-19T20:26:48Z")
1. you would have to add video feed to the program and then it looks for changes in the image, often motion. hense motion sensor
2. this is _ **processing** _.org
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### Author:  [@micuat](https://discourse.processing.org/u/micuat)
#### Post date: [August 19, 2021, 8:31pm UTC](https://discourse.processing.org/t/is-this-how-motion-sensors-work/31792/4 "2021-08-19T20:31:44Z")
1. read [guidelines](https://discourse.processing.org/t/guidelines-asking-questions/2147) 🙂