Op 4 maart 2020 20:09:57 schreef Hunter:
...., want 8 leds onafhankelijk pwm-dimmen gaat op deze manier niet lukken. De controller heeft maar 3 pwm-kanalen.
Nu heb je het over HPWM denk?
Maar er is ook nog zoiets als dit.
code:
Pwm
Syntax
Pwm Pin, Duty, Cycles
Overview
Output pulse-width-modulation on a pin, then return the pin to input state.
Operators
Pin is a Port.Pin constant that specifies the I/O pin to use.
Duty is a variable, constant (0-255), or expression, which specifies the analogue level desired
(0-5 volts).
Cycles is a variable or constant (0-255) which specifies the number of cycles to output. Larger
capacitors require multiple cycles to fully charge. Cycle time is dependant on Xtal frequency. If
a 4MHz crystal is used, then cycle takes approx 5 ms. If a 20MHz crystal is used, then cycle
takes approx 1 ms.
Notes
Pwm can be used to generate analogue voltages (0-5V) through a pin connected to a resistor
and capacitor to ground; the resistor-capacitor junction is the analogue output (see circuit).
Since the capacitor gradually discharges, Pwm should be executed periodically to refresh the
analogue voltage.
Pwm emits a burst of 1s and 0s whose ratio is proportional to the duty
value you specify. If duty is 0, then the pin is continuously low (0); if
duty is 255, then the pin is continuously high. For values in between,
the proportion is duty/255. For example, if duty is 100, the ratio of 1s to
0s is 100/255 = 0.392, approximately 39 percent.
When such a burst is used to charge a capacitor arranged, the voltage across the capacitor is
equal to:-
(duty / 255) * 5.
So if duty is 100, the capacitor voltage is
(100 / 255) * 5 = 1.96 volts.
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