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Does anyone know how to vary the voltage from pic16f887 out of PWM port to vary the brightness of regular character 16 x2 lcd controlled by SITRONIX ST7066U. I work in Assembly thanks
If it has an LED back light, use the PWM from the PIC (look at the data sheet on how to use) and a transistor like a 2n3904... put the PWM on the base of the transistor (through a small resistor) with the transistor emitter to ground. Put the LED back light form V+(anode) to the collector (cathode) with a series resistor so you don't burn the LED.... that is the most simple way...
Vary the brightness by changing the duty cycle of the PWM (also explained in the data sheet)
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