Matrix user forums

Simple little programme for the Byvac BV4512 128x64 LCD Graphic controller using hardware I2C.

http://www.byvac.co.uk/downloads/datash ... aSheet.pdf

Two analogue inputs ( a couple of potentiometers ) are read by the 16F877A to give X and Y coordinates which are plotted on the LCD in the style of an Etchasketch. There are some extra macros that are not used in Main but might be of use.

Thanks
Just bought one of these displays at a rally this afternoon.
I was sure Id seen them mentioned on the forums.
Been able to use your program to verify the hardware is working, they are a nice display.

This is how I have mounted my display.
The jumpers allow the I2C to be configured for any device.

I have drilled a hole in the patch board to allow access to the contrast potentiometer.
The 4 pin connection on the display driver board is connected to the SIL header via an old CD-Rom audio cable.
(Just seen peaking out above the display board)