and apply it.īased on your explanation here are some thoughts. So, the next best approach is the Electronics "technician" cookbook approach. but you are admitting that you are not an Electrical Engineer so you are probably not quite ready for the deep explanations and the theoretic mathematical solutions that an EE explanation would toss at you. There is a lot of Physics theory you could use to approach this problem. Does this matter? What should the Rb be? Have I even selected a sensible NPN transistor for this design?Īpologies, I'm just really trying to learn electronics for the first time and this is likely a very silly question. What's really tripping me up is that the maximum possible output from the Arduino (Ib) could, in theory, exceed the current going to the collector (Ic). For the base resistor, I've gotten anything from 100 ohm to 59k ohm. Base to Arduino pwm out (operating either high or low only for simplicity). Following 3 different tutorials, I've got 3 different values for the resistor that connects to the base. I'd settled on something like a 2N4401 but I'm not 100% sure on this, because I'm having a lot of confusion about these kinds of NPN switching circuits. I was thinking about using an NPN transistor to utilize this circuit. The two terminals have 12V, 2 mA and 0 ohms across them. Completing the circuit activates the device. Here's what I know about the device: There are two terminals for the switch. It has a handy switching circuit built in and I wish to utilize its switching circuit with an Arduino. Here's my situation: I have a device I wish to control. I've read numerous tutorials on this matter and I'm getting very confused.
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