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Use of LDR,A/D converter

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munawar sharif

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I want to use LDR,with the variation of light intensity it should give different voltages to Controller,The LEDS that are "ON" at a time should vary with respect to light intensity,let have five LEDS connected to controller.LDR will give only two voltage levels +5volt or 0volt but i want different levels of voltage more than five.What should i do?A/D converter can be used??
 

An LDR is a variable resistor. If you connect one end to 0V and the other end to +5V through a resistor you will get a variable voltage. An ADC can be used to digitized that voltage and turn the LEDs on at certain thresholds.

You don't actually need a controller. One comparator for each LED would do the job.

Keith
 
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