Can this HAT be used for LEDs or just servos?
It can be used for LEDs as well as any other PWM-able device! Use the Signal and Ground pins if you dont mind the LEDs powered by 3.3V and 220ohm series resistor. Or V+ and your own resistor & LED, if you want up to 5V power for the LEDs
I am having strange problems when combining this shield with the Adafruit LED Matrix/7Seg Backpacks
We are not sure why this occurs but there is an address collision even though the address are different! Set the backpacks to address 0x71 or anything other than the default 0x70 to make the issue go away.
If I'm using it with LEDs I cant quite get the PWM to be totally off?
If you want to turn the LEDs totally off use setPWM(pin, 4096, 0); not setPWM(pin, 4095, 0);
Can this control PC fans?
No, as the control mechanism for PC fans and servos are different. See this product for fan control.
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