Digitally control room light intensity

Posted on Apr 20, 2012

Many people favor different light and temperature settings for different rooms depending upon their mood or whether they are working or relaxing. The circuit in Figure 1 controls the intensity of the artificial light in a room and monitors the temperature of two zones. The two main circuit blocks are the PIC16C67 master controller and the ADT7516 temperature-sensor interface, which includes a four-channel ADC and a quad voltage-output DAC. Other components include a photodiode and an op amp that monitor the ambient light; a rotary potentiometer that sets the light intensity;

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