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Place Raspberry Pi A+ or 3A+ on top of Ace4U board. Thanks to the 4 standoffs, the
pogo pins in place will contact to the testing pads on Raspberry Pi accordingly.
Use the 4 plastic nuts to firmly mount Raspberry Pi on top of Ace4U board. You may
use tweezers to help fastening the nuts.
It is recommended to connect power supply to
the “Power” micro USB port on Ace4U
board (as shown in photo below). That way your Raspberry Pi will be back-powered
via the pogo pins, and all USB devices connected to Ace4U will be powered directly
by Ace4U, and that will significantly reduce the burden on pogo pins (only the current
for powering Raspberry Pi will go through pogo pins).
The power indicator LED (orange) will light up once you connect the power supply to
the board. If you plug USB device into any of the 4 USB ports, the port activity LED
