Use RAB Holder
Before starting the experiment, you need to fix the Raspberry Pi and the breadboard on the RAB Holder first.
Remove the sticker from the back of the breadboard first, and fix the breadboard on the RAB Holder. Pay attention to place it in such a position as shown in the figure below, so that the 3.3V pin and 5V pin on the T-Extension Board align with the bus strips besides the two red lines when we insert the T-Extension Board later.
Then insert the T-Extension Board into the Breadboard, and insert the 40-pin GPIO Cable into the board.
Then place the Raspberry Pi in the holder, fasten it with M2.5x5 screws. Since it may be a little difficult to fasten it, be careful to operate.
Pay attention to the direction when plugging in the 40-pin GPIO Cable into the Raspberry Pi pins. The balck wire at the edge should be close to the TF card slot. DO NOT connect them inversely, or the Raspberry Pi will be short cut!