LCM-WM002 is a 16×2 LCD display, coming from a “refurbished” equipment. To be true, the equipment was a HP 5000 / 5100 laser printer, and the LCD has a bezel and a PCB with buttons attached, named ESU19516, part number RG5-5438.
According to some internet sourse, like www.elektroda.pl or hardforum.com, this is a SPI interfaced LCD. The pinout as follows:
| LCD Pin | Connector pin | Function | Memo |
|---|---|---|---|
| 1 | Left LED, cathode | green | |
| 2 | Middle LED, cathode | green | |
| 3 | Right LED, cathode | amber | |
| 4 | not connected? | ||
| 5 | to switch 0? | ||
| 6 | to switch 1? | ||
| 7 | to switch 2? | ||
| 8 | to switch 3? | ||
| 9 | to switch 4? | ||
| 10 | to switch 5? | ||
| 11 | to switch 6? | ||
| 12 | to switch 7? | ||
| 13 | to switch 8? | ||
| 14 | 3 | CS | |
| 15 | 2 | CLK | |
| 16 | 5 | MISO | |
| 17 | 4 | MOSI | |
| 18 | 1 | +3,3 V | VCC |
| 19 | 7 | +5 V | for backlight |
| 20 | 6 | GND |
Switches are low while pushed.
The possible interfacing is on www.elektroda.pl:
| Bit | 15 (MSB) | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 (LSB) |
| Function | RS | E | LED 1 | LED 2 | LED 3 | LED 4 | LED 5 | Backlight | ||||||||
| Memo | Bity 8-15 – ZANEGOWANE dane dla wyświetlacza. Bit 15 jest najbardziej znaczący oraz w nim zapisujemy MSB danych dla HD66710. | state of the RS line: 0 for data, 1 for instructon | state of the E line on the HD66710, active LOW | active LOW | active LOW | active LOW | active LOW | active LOW | active LOW |
To be continued.