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A comment on What's that touchscreen in my room?. Parent comment

Re:What's that touchscreen in my room? by teekert on Saturday January 20, 2024 @09:38AM (#39067955)
P1 port is specifically to read values and “open”. There a 10€ cable to convert it (passively) to usb.

You could consider one of those clamps that measure the power through a cable from the fields around it?

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Re:What's that touchscreen in my room? by dancsi on Sunday January 21, 2024 @08:11AM (#39078142)
Actually, it is just serial under the hood, although electrically slightly nonstandard.
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