**** note which IO is in power system, which is in data acq 
**** connection/interface between power electronics and data acq computer 

power
- isolation
- ckt breakers (oc, ov)
- pc104 ad, gpio, custom io card 
- uv, ov, oc [per load, bus]
- current, voltage [per load, bus]
- inrush limit (program startup time, write only)
- gf current [per bus, per load optional]
- load switch relay (galvanic iso) [per load, lights, cameras, motor controllers - anything we want to shut down]
- load switch mosfet (load switch)
- all relays readback (DPDT) []
- LV converter (48->24 V power chassis)

environmental
- temp  [ambient, vicor, vicor heatsinks, pc104 PS]
- humidity []
- water []
- pressure []
*- 3-axis accelerometer []
*- cooling fan (PC104 power supply) [digital output, input]
- hard to pin down interfaces - consider analog for simplicity

comms
- isolation

sys power

isolation:
opto
transformer
galvanic iso relay

serial expansion:
gumstix has serial io expansion
multi port digi (power)
spi/i2c (meant for on-board, short run)
usb (cable length? USB?)
bluetooth (bandwidth - 2.1 Mbps [enhanced])
FPGA UARTs (can add digital IO too, reconfigurable...)
802.11 underwater?

phone
gumstix+android? prob yes
technologics+android? maybe not yet...