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Depending on the microcontroller and library used
wireless meter reading
The Power Switch Tail II is a smart alternative to slicing apart power cords to wire up your own relays
electronics
Diameter: 3mm 
DC Barrel Jack 2.1mm 5pcs - Panel-Mount Female verter Depending on the microcontroller andDC barrel jacks allow PCBs to connect to an external DC power supply. This particular DC jack fit 2. 1mm power plugs snugly and securely. No need to discharge your batteries in prototyping. Just grab one of these DC jacks, and you are already set. Specifications: Color: Black Type: 5. 5mmx2. 1mm Socket Total Size(Not Include Pin): 1. 5x1cm Library: None Inclusions: 5 x DC Barrel Jack 2. 1mm Documents: None
US$ 23.50
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