Some resources to help you getting started with STM32 programming.
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A Magnetic Contact is an electrically controlled switch used for switching a power circuit, similar to a relay. Magnetic contacts give exact position of the door (open/close).
Suitable for Door, Window, drawer, cabinet... etc. When door or window was opened, the detector will wirelessly connect to the security alarm system which will call the host or whistle for warning. It has 2 LED indicator for power and signal and have sticky tapes on the back.
Power Supply : 23A 12V battery x 1 pcs (battery not included)
Arduino Library: https://github.com/sui77/rc-switch
Note: Images are just for representational purpose, and the layout, color, etc. keeps on changing.