DC Barrel Jack 2.1mm 5pcs - Panel-Mount Female verter The Bluefruit LE UART Friend

The Bluefruit LE UART Friend makes it easy to add Bluetooth Low Energy connectivity to anything with a hardware or software serial port

const int BUZZER = 8

You may use this to have a power supply for your laptop using a 12V power supply

Diameter: 3mm&nbsp

IR sensors work by detecting infrared radiation and converting it into an electrical signal

DC Barrel Jack 2.1mm 5pcs - Panel-Mount Female verter The Bluefruit LE UART FriendDC 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