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I need help detecting an objects proximity, and lighting up led's with an arduino uno.

givingtnt

so here's what I want to do. I have a led strip (or more than one idk) and I want to detect an object. as it comes closer, the leds light up in sequence. (kinda like those audio display things)  gradually lighting up untill the whole strip is lit up.

 

what kind of sensor should I use ?

and led s ?and how do I make them light up one at a time ? (say this is the strip : 0-0-0-0-0, I want them to light up like : 1-0-0-0-0, 1-1-0-0-0, 1-1-1-0-0, 1-1-1-1-0, 1-1-1-1-1 as the object gets closer)

 

 

 

Im very new to this stuff. thanks !

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  • How to light up the LEDs is based on your particular device. Regular strips cannot be controlled one at a time (without a controller). Check the documentation of your strip to see how it's controlled. For this reason, I had to create my own assembly to control, though it required one pin per LED.

     

    For programming that, let's say you want to program a stereo display, where a higher sensor reading means it's closer. Use if statements, starting at closest: because starting lowest with this if can make all statements true!

     

    If (SHARP > 500) {turn on all 3 LEDs}

    else if (SHARP > 300) {turn on 2 LEDs}

    else if (SHARP > 100) {turn on 1 LED}
    else {turn off all LEDs}

     

    Just ensure to set a timer at the end of activating each check, and set all LEDs to OFF if the value range changed, or you may end up with false readings.

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  • How to light up the LEDs is based on your particular device. Regular strips cannot be controlled one at a time (without a controller). Check the documentation of your strip to see how it's controlled. For this reason, I had to create my own assembly to control, though it required one pin per LED.

     

    For programming that, let's say you want to program a stereo display, where a higher sensor reading means it's closer. Use if statements, starting at closest: because starting lowest with this if can make all statements true!

     

    If (SHARP > 500) {turn on all 3 LEDs}

    else if (SHARP > 300) {turn on 2 LEDs}

    else if (SHARP > 100) {turn on 1 LED}
    else {turn off all LEDs}

     

    Just ensure to set a timer at the end of activating each check, and set all LEDs to OFF if the value range changed, or you may end up with false readings.

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