i have a old calculator laying around. I came to the idea of adding an arduino to it. I want to use the same lcd screen. So i opened the culculator and locked at the connections of the lcd screen. There are about 100 connections, however i saw there are 16 connections with a soilder spot. Here is an image:
I know that there are 16 pins on traditional arduino lcds. DO there pins have the same function as the soilder spots? Is there a way to test which pin is VCC, Ground, ... ? Unfortunatelly i dont have the circuit board map.
What 'traditional arduino lcds'?
No they don't have the same function as board pins.
That lcd might use AC anyway. There's no point to trying to use that screen.
You won't control the screen itself with an Arduino. You always control the specific LCD controller chip with the Arduino - and there are only very few libraries available for the Arduino (for different controllers).
And I suspect, your controller has no Arduino library unless you write your own - and that's not easy at all.
Better buy a "common standard" supported LCD display unit which is proven to work with an Arduino.
This will save you money, time and nerves.
