PWM seems to fail when DC * Freq is a small number
A Python module to control the GPIO on a Raspberry Pi
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croston
Following ticket 99, I looked for a workaround in the form of very low dc and frequencies in order to turn LED on and off between periods of flashing.
Thence discovered that PWM seems to be sensitive to the MULTIPLE of frequency and duty cycle.
So, for example, if you set:
dc = 1
freq = 0.01
Then it will seemingly kill of the PWM in the sense that, if you then increase dc and freq. to levels that would be "visible" on an LED, nothing happens.