mdrjr wrote:1. You can't power the ODROID off the UART port.
2. Them buy a single PSU with enough amps to power it up..
odroid wrote:4 pins are tied to GND and 1 pin is connected to 5volt.
Note that you must have a good power supply which has very stable output voltage for heavy load variation (lower voltage drop).
Output range must be 4.8V~5.2V (well regulated and stable)
mdrjr wrote:I don't see why use a 4pin molex while a 2pin can solve.. Are you trying to use a computer PSU ?
Matt wrote:If you are going to use an ATX/EPS power supply by itself, then you may have to do some work to get it to provide power without all the other rails plugged in. Most modern PSUs will not start unless there is a load on the 12V rail and the 5V rail. You should be able to find some how-tos online that go over what you have to do to make it work... look for articles on using an ATX power supply as a "benchtop" or "bench" PSU. Also keep an eye on exactly how much current that PSU can actually supply on the 5V rail. Most of the wattage from an ATX supply is provided to the 12V rail. The 5V rail is used to power some parts of the motherboard, USB ports, the controller board on hard drives (the spindle is 12V), and usually the full solid state drive (they don't usually use the 12V lines).
You might have to spend a lot of money on unused 12V power capability to get enough 5V juice to power all the U2s that you want to use.
BTW, I pointed out some little DC-DC converter boards on aliexpress.com to mdrjr that take a range of input voltages from like 4-40V and can output 2.5-38.5V at up to 3A. You could use a 12V source at 40A to power almost 90 U2s (correcting for efficiency). Just search for "LM2596 DC converter regulator". They are just boards using a circuit diagram right out of the datasheet for the TI Simple Switcher line of LM2596 switching regulators. He ordered a few of them, and hopefully he can give us a report on how well they work whenever he gets them.
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