I was trying to use a solenoid lock alongside the arduino, using a 12V 2A DC adapter, TIP120, and a diode. The circuit looks something like this . However, the lock isn't going in automatically (it requires a push). I've tested the circuit using a multimeter, and the output given by the transistor,…

Arduino + Solenoid Lock

blh64 April 23, 2018, 12:02pm 2

Are your grounds all connected like the picture?

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