As the project continues, things are moving forward. I decided to add a 12 V power supply, which is capable of 3 A output, so everything will be fitted in one box. Since the Iris board and hard drive consume only 316 mA at idle that will be more than enough.

12 V power supply
12 V power supply

Actually that gives me capability of hooking up different external devices. For that purpose I also designed an expansion board for Iris, which plugs on X16 connector. It has 2 power outputs (relay  driven), 4 direct connections to GPIO pins, I2C and UART.

Expansion board
Expansion board

As I said in the previous post the Iris board has only one USB port for hosting other devices, so I ordered a cheap 4 port USB hub for 1.28 $ from eBay. I disassembled the case and mounted the hub on my expansion board. I will use one port for HDD, 2 on the front panel, and one at the back.

USB hub on expansion board
USB hub on expansion board
Expansion board on Iris
Expansion board on Iris

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