My question is mostly if I am doing it right.
I have a snap circuit kit (kinda like a breadboard for kids). I also have a Maximite computer (kinda like a Arduino running basic with monitor out). The Maximite has some I/O pins that according to the technical details are high at 2.6V to 3.3V. Also, the maximum current that a pin can deliver is 25mA. The snap circuit kit uses between 3V and 6V depending on the circuit. What I would like to do is to use the Maximite to turn things on and off on in the snap circuit. For example, I might want to turn a 6V lamp or motor on and off.
I am pretty sure that I would want a transistor for this. In particular I think a n channel MOSFET is what I need. I looked up the datasheet for an IRF530 and see that the "Gate Threshold Voltage" is between 2.0V and 4.0V. If I understand things, that means that this MOSFET will "turn on" when the gate is given between 2.0V and 4.0M. Is that right?
Concretely, I am thinking of doing the following:
My question is really just if I am doing this the right way and if there are any other things that I should keep in mind or think of. (I would also welcome other suggestions on how I might do what I want to do.) Specifically I am wondering if it is correct to connect the two grounds/negative terminals.