Using a low-cost power source

I have seen a picture on the Web where somebody powered a dozen older Beagle Boards with a lot of single DC adapters and built everything into a portable case. The result was a huge mess of cables. You should always try to keep your cables well organized in order to save space and improve the cooling performance. Using an ATX power supply with a cable tree can save you a lot of money compared to buying several standalone power supplies. They are stable and can also provide some protection for hardware, which cheap DC adapters don't always do. In the following section, I will explain the power requirements and how to modify an ATX power supply to fit our needs.

Power requirements

If you do not use an additional keyboard and mouse and only onboard flash memory, one board needs around 500 mA at 5 V voltage, which gives you a total power of 2.5 Watts for one board. Depending on the installed memory card or other additional hardware, you might need more.

Note

Please...