These are small spring terminals. Open the aperature with the small arm, insert the wire, release the arm and the wire is held firmly in place. This is a good quick way to to interface to bare wires. Capable of higher current and more resilient than breadboard or female header type connections.
Terminals with 0.1" standard spacing. Inserts directly into perf and proto board. Comes in 2, 3, 4, 5, and 6 positions. Rated up to 150V @ 2A. Terminal can accept 26 to 20AWG wire.
This skill defines how difficult the soldering is on a particular product. It might be a couple simple solder joints, or require special reflow tools.
Skill Level: Noob - Some basic soldering is required, but it is limited to a just a few pins, basic through-hole soldering, and couple (if any) polarized components. A basic soldering iron is all you should need.
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This 3 pin shown has 2 rows of 3 pins, do you need to connect just one pin for each each hole or do you need to connect both for each hole? I'm guess its 2 just for stability?