Gronk

Pinout for control panel

The original "SIGN MAX" control panel has an LCD, a bunch of buttons, and a ten-pin connector.

5 pins to LCD, red is pin 1

Note: Not looking into the LCD yet

Pin	Function
1	+5 V / RED led
2	GND
3	GREEN led
4	Reset button (ties to GND)
5	Buttons row 1
6	Buttons row 2
7	Buttons row 3
8	Buttons column 1 / LCD 1
9	Buttons column 2
10	Buttons column 3

Button matrix configuration

There's a diode at the bottom of every column, so each of 5/6/7 should be pulled high in turn, and 8/9/10 scanned for their values. There should be pulldowns on 8/9/10.

	8	9	10
5	ONLINE	SET	TEST
6	P+	S-	P-
7	-	OK	S+

Repository

Currently at [1].