I've found a nice little LCD-Dispaly in an old glucose-meter, which I'd like to use which one of my projects.
The display is connected to the PCB by 6 wires. As there are no markings or numbers on the LCD, I don't know how these wires are connected. I figured it must use some kind of SPI or i2c protocol to communicate... So I tried to analyse the connections with my arduino using this simple sketch:
And this was what I measured:
pin1: 1023 (obvioulsy VCC)
pin2: 0 (Ground)
pin3: continously 550
pin4: continously 330
pin5: continously 550
pin6: continously 120
I expected to find at least one pin, where the voltage would regularily alternate between 0 and 1023 (serial clock). But the voltages don't alternate at all... :o
Did I make a mistake somewhere or can someone think of another way to find out how to communicate with that display?