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4.4 POWER SUPPLY
The hardware of our choice, the PCM-5896 uses an ATX power supply. Our demo is to
be carried out using an A/C ATX power supply which plugs into the wall.
In order to consider this a truly mobile application we need to have a DC to DC ATX
power supply with a battery power source Most DC to DC power supplies require 12V or
24V DC power input. 12V power input is more desirable since it is easy to locate DC
power sources such as video/camcorder batteries as well as laptop batteries at that
voltage. On the other hand their availability was lower and none of the companies that
advertised carrying them had them in stock. 24V input DC to DC power supplies were
more widely available. However I was only able to locate one 24V DC power source
which was a laptop battery.
The PCM 5896 draws about 2.3A of current from the 5V output. It will draw about 75W.
Battery to power DC-DC ATX at 24V:
Zenith Turbosport 386E 24V 2.2AH NiMH PL B-511 $141.80
We were unable to incorporate the DC-DC power supply into our hardware solution
because we were running into roadblocks quite late in the game and the possibility of us
achieving full functionality was called into question. But the DC-DC power supply can
be integrated quite easily into the prototype without changing any of the properties of the
Hardware or the Software.
http://www.proxim.com/wireless/standards/80211wp.shtml
4.5 USER INTERFACE
We chose the Remote Access Device which was an interface for a Serial LCD and a 16-key keypad.
The people at EMAC also provided us with the Serial LCD and Keypad as they had misquoted what
actually came with the RAD unit. This was supposed to be compact and mobile replacing the clunky
keyboard and monitor. This communicates with the Single Board Computer using the RS-232 serial port.
Supplier and
model number
DC Input
Voltage
Power Min Current on
5V
output
Price Max Current on
5V output
Silicon Rax Sliger
pws-300atx/+24
24 300W 2A $110.00 30A
Quantum Power
Labs
12 250 W 2A $149.00 25A
BSI COMPUTER
PS-916V ATX
12 100 W 2A $137.00 20A
(3 Seiten)
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