A quick bit of code to test the HPDL-1414 device with the Arduino. See the datasheet.
There are a numbber of macros defined at the top of the ino file:
DS_x: the arduino pin to which the numbered digit select pin is connected.DI_x: the arduino pin to which the numbered data input pin is connected.N_WR: the arduino pin to which the active low write pin is connected.FRAME_LEN_MS: the number of milliseconds each scrolling frame should be displayed.
Other macros are explained inline, and should stay constant for this device.
Scrolls the text defined in the input parameter across the screen. Note that the string must be terminated by a null (\0) character. If you're not familiar with C, "double quoted" strings are terminated with \0 automatically.
This was tested on an Arduino Duemilanove with the following wiring:
| HPDL-1414 Pin | Arduino Pin (Digital) |
|---|---|
| 1 | 9 |
| 2 | 7 |
| 3 | 6 |
| 4 | 5 |
| 5 | 4 |
| 6 | 5V |
| 7 | GND |
| 8 | 13 |
| 9 | 12 |
| 10 | 11 |
| 11 | 10 |
| 12 | 8 |