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PIC controlled compass CMPS03 to graphical LCD

PIC controlled compass CMPS03 to graphical LCD

Readout of compass module CMPS03 to a NOKIA graphic LCD type LPH7779 used in a Nokia 3310 GSM. Controlled by a PIC16F877 at 4 MHz. Uses an I2C EEPROM 24C256 for character and symbol data.
How does it work?

Of course, the microcontroller 16F877 does most of the job.

1* Driving the graphic LCD module type LPH7779 (used in a Nokia 3310 GSM) This takes 5 data-lines (see basic schematic.) These are output only, which means that the LCD module only receives data. So we have to be very careful with signal-timing here.

2* Interfacing the CMPS03 module. We use the I²C interface for maximum resolution. Only the registers 2 & 3 are read (binary 16 bit, 0 to 3599.) This data is then converted to decimal and sent to the LCD.

3* Interfacing the I²C EEPROM 24C256. This stores character and symbol data. The NOKIA LCD module does not have an on-board character set (so each pixel has to be set individually.)

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