August 2022
Intermediate to advanced
128 pages
6h 3m
English
Content preview from Make: Volume 82
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PROJECTS: Arduino Fingerprint Sensor Lock
5. WIRE THE RELAY TERMINALS
The relay's middle screw terminal is the COM
(common contact) that will be connected to the
second terminal when the signal pin is set to
HIGH. Connect the positive wire from the solenoid
door lock to this COM terminal.
The second terminal used is NO (normally
open); this represents the status of the terminals
when there is no signal coming from D5. Attach a
relatively long wire to be routed later (Figure
F
).
6. ADD THE 9V BATTERY
Using the wires from Step 3, solder Arduino GND
to the battery connector’s negative terminal,
and solder the flip switch pin to the battery
connector’ ...
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