I am trying to control the screen brightness with a PWM signal on a NHD-7.0-HDMI-HR-RSXP-CTU.
The PWM signal is generated by an arduino, by setting its hardware registers (as described here:
The arduino sketch is quite simple: read a potentiometer and set a hardware register accordingly, so a suitable PWM signal is generated (62.5 KHz).
My approach works while the HDMI cable is disconnected.
When I plug the HDMI cable, the screen goes from full brightness to dark.
Can anyone help me understand what is going on?
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