Proximity Sensor to display LED color pattern.

[verduzconi]

Hi everybody!

Can anybody can help me or give me ideas/hints on how to design, what to use a circuit that will display with LEDs a color pattern depending on an object approximation to the circuit ?

Let me explain:

Say you have the circuit wich has RGB LED's; i need that whenever someone or something approximates to the proximity sensor (any type) the RGB LED fades into a different color upon closeness of such object. Say the RGB LED is set to display a default color Red; if something comes closer it FADES into blue, even closer and it fades to green until having a color (say white) for a 100% closeness to the circuit.

Any ideas ??

[gohm]

Not really my area, however how about an IR occupancy sensor hooked up to a speed controller and a servo? As the IR return rate increases due to closing distance, the speed controller would operate the servo which would switch your color. You could also hook it up to a x & y axis device (think tiny theramin) that would automatically ajust color based on spacial location.

[reachrkata]

I don't know about IR, but I surely know that Ultrasound is used for distance measurements in parking assist systems of cars. Its simple. Just use the distance data measured to control the LED.
I would suggest against servos. You anyway would using a uC to measure the distance. You the same to control the PWMs to the RGB LED, whereby you can give many colour combos.

-Karthik