Can anyone tell me the lowest frequency beaglebone black can get ? I dont own it yet but if it can do what I need, I will buy.
Are you talking about processor frequency or PWN frequency?
PWM output can be generated in two ways. The lowest frequency depends on the used device:
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ehrpwm: 0,426 Hz (= 100e6 / 0x1FFFF / 1792, 2 x 3 pins available - A and B output @ same frequency)
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eCAP in PWM mode: 0,0233 HZ (= 100e6 / 0xFFFFFFFF, 1 pin available in default configuration)