Electronics > Projects, Designs, and Technical Stuff
Fingerprint Module with Door lock Solenoid - Arduino Nano .. Need help
Marco:
You number wire connections on the Outside door Bell as if the numbers mean something, which they might if you actually told me the real product number of what you're working with ... but then you just draw the solenoid+power-supply willy nilly without indicating to what number connection they are attached to. It's a mess.
The transistor emitter should attach to the negative output of the door strike power supply, the transistor collector should attach to the positive output of the door strike power supply. The transistor should have a 100 Ohm base resistor. You possibly need a diode across the solenoid. The negative output of the door strike power supply should be the ground for your arduino.
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