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@Bram, @jsotola is highlighting in the comments that the example photo you show with a 9 pin keyed two row connector has two usb cables connecting to it. USB connections often have four wires each. The standard wire color coding is: (Source Wikipedia - USB) Board manufacturers are often looking for a simple way to connect multiple panel mount USB ports to ...


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Yes, you can use that supply to power the solenoid. It is basically an electromagnet, so just a coil of wire. It has a specific resistance, so if you provide12V (as Adafruit specifies for it) only 1A should be drawn. Though since you most likely want to control it with the Arduino, you would also need a MOSFET transistor, which can handle more than 1A while ...


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I'm going to guess that you are doing something like a door or safe lock, which may occasionally be used to activate a motor to unlock something but 99.99% of the time is sitting there doing nothing, and you want to save power in that time. You need to rework somewhat. An interrupt to detect a switch press. Then the processor can sleep, using very little ...


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