In this circuit, the following features of PIC16F873 are used. A/D converter The voltage controlled by the variable resistor (Analog) is converted to the digital signal.This signal is used to control the pulse duration (the duty) of PWM.Compare A/D converting is executed every 1-millisecond period using this function.PWM The electric current which flows through the lamp is controlled by the PWM pulse signal.In this circuit, the pulse of about 610 Hz is used.
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