LCD88 – hardware

Parts

There are few parts required for LCD88:

  • Processor
  • LCD display
  • Keyboard
  • Power source
  • Sticks and switches (from old tramsmitter)

My first version of LCD88 have processor, lcd and power source on one custom pcb board, but I’ll focus on ready modules.

Processor

  • Project uses Atmega88 (soon will be discontinued), Atmega168 or Atmega328 AVR processor.
  • Code supports frequency up to 16MHz (sorry, full 20MHz is not supported right now)
  • Supply voltage: 3-5V, it depnds on you.
  • Processor should have crystal oscillator
  • All pins should be availabe, if you use cpu in DIP packaging, keep in mind that you have only 6 analog inputs instead of 8

Basically, typical Arduino Pro Mini with Atmega328 at 16MHz is best choice for that.

LCD Display

Supported displays:

  • Siemens S65 L2F50
    • resolution: 176×132
    • chipset: L2F50
    • power supply: 3.0V
    • logic level: 3.0V
    • backlit: 10.5V
    • pictures: S65 L2F50 - back

      S65 L2F50 - front

  • Siemens S65 LS020
    • resolution: 176×132
    • chipset: LS020
    • power supply: 3.0V
    • logic level: 3.0V
    • backlit: 10.5V
    • pictures: S65 LS020 - back

      S65 LS020 - front

  • HY-1.8 SPI (blue)
    • resolution: 160×128
    • chipset: ST7735
    • power supply: 3.3V or 5.0V
    • logic level: 3.3V
    • backlit: 3.5V
    • pictures: HY-1.8 SPI (blue) - back

      HY-1.8 (blue) - front

  • 1.8TFT SPI (red)
    • resolution: 160×128
    • chipset: ST7735
    • power supply: 3.3V or 5.0V
    • logic level: 3.3V
    • backlit: 3.5V
    • pictures: 1.8SPI (red) - back

      1.8SPI (red) - front

  • Arduino GLCD
    • resolution: 160×128
    • chipset: ST7735
    • power supply: 5.0V
    • logic level: 5.0V
    • backlit: 5.0V
    • more here

Connecting processor and display

TODO 🙂

Keyboard

This is only part you should do yourself.

Parts needed:

  • 6x tact switch
  • 6x 1N4148 diode
  • 3x resitor 2.2k (smd 0805 if you want to use my pcb design)
  • 4 pins header

Schematic diagram:
lcd88 keyboard - schematic

PCB:
lcd88 keyboard - pcb

Eagle files could be found at https://github.com/majekw/lcd88/tree/master/pcb

That’s how it looks like on home-made pcb:
lcd88 keyboard - front

lcd88 keyboard - back

Power source

TODO 🙂

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