While the original USB standard handles simply parallelling devices, USB 2.0 and USB 3 do not accept this. The breakout board presented is constructed on strip prototyping board, and features an input for the SMPS power supply, and pass through for two USB cables. Using one HDD from the USB port sometimes generated a low-power warning when running the Pi from its USB micro-B power input. For this reason, a Switch Mode Power Supply (SMPS) board was chosen, which can take a 12V 2.5A input and yield a consistent 5V at 5 amps, although the 12V, 2.5A plugpack we used will allow around 4.7 amps out of the SMPS after efficiencies and losses are accounted for. Additionally, it may be desirable for people to use more than one hard drive. The size of the wires involved does not help, and voltage drop can easily occur at larger loads on thinner wires. This occurs any time large loads are drawn on a power supply that cannot maintain the current required, and the current available through the USB micro B connection is minimal. If the voltage falls below around 4.8 volts, the Pi will reset. The Raspberry Pi series need fairly precise power requirements. We’re also describing how to make the case look a bit less 3D-printed, although deadline pressure meant we didn’t get the finish as smooth as we wanted to - but you can! POWER Having introduced you to Kodi and explained the use of the Raspberry Pi to utilise it, it is time to demonstrate our build for the Media Centre, which contains the power supply, hard drive(s), cooling fans, and our USB power distributor and hard drive interface. BUILD TIME: 2 Hours (Not including 3d Printing Time) This month, we complete our media centre with hard drive storage, a suitable power supply and 3D printed case.
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