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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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  • Hi Marc-Andre,

    Chapter 4 Page 86 of Jeremy Blum's Book Exploring Arduino shows how to build a sweeping Distance Sensor that lights up a series of LEDs depending on the proximity. You can ignore the sweeping portion and just build the distance section. Here is Jeremy's web site:

     

    http://www.exploringarduino.com/content/ch4/

     

    This is an excellent book for learning about the Arduino and many of the basic things that can be done with it.

     

    John

  • in reply to jw0752

    thats kind of half of what I want.

     

    I want a system that the closer you get, the more leds light up.

     

    this one just lights up the led when it detects something. I need it to light up more and more leds as the item comes closer to the sensor.

     

    the range of travel is around 15cm

     

    also, can you reccomend a red, singularly adressable led strip ?

     

    or should I just make my own grid ?

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  • in reply to jw0752

    thats kind of half of what I want.

     

    I want a system that the closer you get, the more leds light up.

     

    this one just lights up the led when it detects something. I need it to light up more and more leds as the item comes closer to the sensor.

     

    the range of travel is around 15cm

     

    also, can you reccomend a red, singularly adressable led strip ?

     

    or should I just make my own grid ?

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  • in reply to givingtnt

    You can use the IR sensor that was used in the book to read a distance. Then you can have the Arduino turn on an appropriate number of LEDs to correspond to the output of the IR Sensor. If I remember correctly there are two versions of the IR sensor. One for relatively close detection and one for up to a couple meters. The UNO would need an input for the sensor and would still have perhaps 10 or 12 outputs available to drive LEDs. Sorry I thought the project I mentioned was set up to do what you wanted. Another path that you can explore would be a simple LED Voltage indicator. I googled LED voltage indicator and there were lots of circuits and hardware mentioned. In your case you would use it to measure a representative of the voltage of the output of the IR sensor.

     

    I will think on this some more and may have some more suggestions but also the other guys will also probably give you some good ideas.

     

    John