Re: Pen Up / Pen Down

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OK, I looked at the schematics and board layout, and my best guess is that the 3.3v signal should come across the two outboard pins on B3 (assuming I tell the software to use that).

The numbering system used in those diagrams is not consistent with what is on the board, if I’m reading it correctly.
Also the labeling ground pins with a “+” sign is not a usage I am familiar with.
So, should I look for a 3v signal across the outboard pins of B3 (if I set up the software properly)?
In other words, which is the “signal pin”?
And, if so, which side should be positive? (The relay coil specifies a positive terminal, but I suspect that it shouldn’t really care.)