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Variable flashing LED using PIC18F242

Variable flashing LED using PIC18F242

A simple project to get to know the 18F242. A flashing LED with the frequency controlled by a variable resistor. Turn left to increase the flashing frequence, turn right to reduce.
The code is very comparable to that used for a 16F877. Note however that this time the resolution is set to ‘low’ and the sample is also taken in low resolution (PIC_ADC_read_low_res (0, resist)). That’s because this PIC is 16 bit, so high and low byte this time really means something.



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Everything is relative of course. Low res means 255 steps. The variable resistor applies a voltage between 0 and 5 volts. In 255 steps this means 0.02 volts resolution, impressive!!

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