Velleman IO Magnetisk REED kontaktmodul til Arduino® (2 stk.)
10A58C80 | VMA308
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A Reed contact switch is a normally open contact which closes in the presence of a magnetic field. This modules contains a 10 Kohm pull-up resistor.
Voltage: 5 VDC
Connection: 3 pins, +(middle pin), ground and DO (data out)