• Nokia 1100 Wiring Diagram (with voltages).
• H-18/36/38 Schematic Diagrams, Nokia 1100 schematics.
• Service Manual 1100/1101 Level 1&2, Nokia 1100 service manual.
• RH-18/36/38 Series Transceivers, Nokia 1100 service manual.
• PCF8814 datasheet.

• Nokia 1100 LCD Interfacing with Microcontroller.
• Nokia 1100 LCD Pic interface (with link to code).
• Connecting the display from Nokia 1100 (Russian).

• From this circuit it appears that the phone drives the backlight LEDs with a constant current of about 100mA.

To reuse these in Arduino projects it is useful to have them mounted on a PCB.

After disassembly the LCD's transparent light guide can be trimmed down to the size of the LCD:

I have some spare Nokia 5110 adapter PCBs that can be modified to accommodate them:

The four LEDs were removed from the top of the Nokia 5110 adapter PCB, and the capacitor on the bottom was replaced with a wire (there is a capacitor mounted on the Nokia 1100 LCD's light guide with the backlight LEDs, so it doesn't need an external one for the LCD voltage booster). Then a piece of the reflective white backing from the phone's PCB was applied to the top surface of the PCB to give a reflective surface for the backlights:

The tidiest way to secure the LCD to the adapter PCB was using a modified frame from the original faulty Nokia 5110 display:

Tested with Arduino Pro Mini, 8MHz, 3.3V:

• Library: Adafruit_GFX_Library
• Library: PCF8814-Nokia-1100-LCD-library
  • test.ino
  • Adafruit_GFX life.ino