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The display is HD44780-compatible. According to the book "Microcontrollers: From Assembly Language to C Using the PIC24 Family", it has TTL-level inputs, so 3.3V logic level can drive it. Thus, no logic level shifter is required. | The display is HD44780-compatible. According to the book "Microcontrollers: From Assembly Language to C Using the PIC24 Family", it has TTL-level inputs, so 3.3V logic level can drive it. Thus, no logic level shifter is required. | ||
=== Cobalt RaQ Links === | |||
* http://www.t2-project.org/packages/lcdutils.html (lcdutils-0.2) | |||
* https://github.com/uberlinuxguy/rpi-cobalt (docs) | |||
Version vom 5. März 2017, 00:08 Uhr
| Language: | English |
|---|
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Blinkenwall Controller
Case is from a Sun Cobalt RaQ 550. The controller for the Blinkenwall is an ODROID C1.
Front Panel
The front panel has the following connector:
| Function | Pin | Pin | Function |
|---|---|---|---|
| Display Enable | 1 | 2 | Transceiver !OE |
| GND | 3 | 4 | +5V |
| Display D1 | 5 | 6 | Display D0 |
| Display D3, Button Up | 7 | 8 | Display D2, Button Left |
| Display D5, Button Right | 9 | 10 | Display D4, Button Down |
| Display D7, Button S | 11 | 12 | Display D6, Button E |
| Display RS | 13 | 14 | Display R/W |
| GND | 15 | 16 | +5V |
| LED Cathode "Earth" | 17 | 18 | NC |
| LED Cathode "HD 1" | 19 | 20 | LED Cathode "LAN 1" |
| LED Cathode "HD 2" | 21 | 22 | LED Anode "Wrench" |
| LED Anode Power Button (two LEDs in parallel!) | 23 | 24 | LED Cathode "ETH 1" |
| LED Cathode "LAN 2" | 25 | 26 | Button Power (with HW debouncing) |
| GND | 27 | 28 | +5V |
| NC | 29 | 30 | NC |
| LED Cathode "ETH 2" | 31 | 32 | NC |
| NC | 33 | 34 | NC |
The transceiver is used so that you can put the display data pins and the buttons on the same GPIOs. It's a 74F245. The display is a HDM16216L-5-LCEP.
The voltage is 5V for everything, except for the buttons. These simply pull to GND and have a 4.7kΩ pullup.
Display
The display is HD44780-compatible. According to the book "Microcontrollers: From Assembly Language to C Using the PIC24 Family", it has TTL-level inputs, so 3.3V logic level can drive it. Thus, no logic level shifter is required.
Cobalt RaQ Links
- http://www.t2-project.org/packages/lcdutils.html (lcdutils-0.2)
- https://github.com/uberlinuxguy/rpi-cobalt (docs)
