ROKU_HD_5x8 
Features:
Microprocessor Controller and the modes of operations are as follows selected by jumpers on the 'Options Header': (to be determined).
The maximum current draw on any one pin of the ULN2803 is 300 milliamps. The maximum aggregate draw (all outputs combined) is approximately 1 ampere. Most small lamps draw only 40-50 milliamps so the current capability of the ULN2803 should be adequate for most applications.
Preliminary: This board utilizes a synchronous serial port protocol using the Brightsign I/O port. BTN-7 is the 'Master Clear'/Reset (MR), Btn6 is the Data Clock (CLK), and Btn5 is the Data bits (SDO). The first bit to send is bit 7 of the data byte. This synchronous serial port operation will have to be programmed using the Brightsign 'script'. I will make a link to this script at a later date.
Note: Btn0-Btn4 are available as inputs. The PIR connector connects to Btn4 on the board (shared connection).
See the document 'Brightsign SSP' for how the Synchronous Serial Port works from the Brightsign.
See the schematic for pin outs and connections.
| Note: External Supply Voltage: An External Power Supply is needed to power the loads on the output connector. Do not connect any loads that have their own power that exceeds the power as applied to the board using the 'Ext. Power Connector'. Doing so may result in damage to the board. I.E. Suppose that 12 volts is supplied to this board and you have a relay board with it's own power of 24Volts DC that powers the relays. The 24VDC will feed back into the board via the foldback diodes. Note: Foldback diodes are required for inductive loads such as relays or small motors. |
Updated: October 1, 2009