Blinkenwall.com/Controller

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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:

Raq 550 Pinout

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.

LEDs

All LEDs except for the wrench and the power LEDs are common anode. Specs: If=10mA, Uf=2.65V

The power LEDs are in parallel (wtf), Specs: If=20mA, Uf=2.04V

Wrench: If=10mA, Uf=2V

Cobalt RaQ Links

• http://www.t2-project.org/packages/lcdutils.html (lcdutils-0.2)
• https://github.com/uberlinuxguy/rpi-cobalt (docs)