You will need:
1) Reed switch - This is a glass tube with contacts. When holding a magnet to the reed switch, it closes the contacts. You can get it by disassembling the reed relay, there are also reed switches in the door closing sensors for alarms, etc.
2) vibro motor from a broken mobile phone.
3) Battery of small diameter. In order not to reinvent the wheel with a crown, I suggest just buying a "mezinchik" battery.
4) Little magnet.
5) Marker
6) etc . . .
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