SUCCESS!
We can now transfer messages from one M32 to another using pulse-width modulation.
The sender M32 transmits a sequence of letters (each represented by an 8-bit code) using pwm. The receiver gets the sequence and immediately shifts the letters into the LED display. So I didn't do the Checksum, and in fact the sender doesn't even wait for a response from the receiver before sending. But all this can be added later.
The transfer occurs when I touch the two yellow wires and ceases when I let go (see photo/video).
Next step: the keyboard!
Transferred Message: I ATE ALL THE CAKES
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