arduino 2n7000


All I’ve done is soldered two green wires onto the end I’m. Gon na add some tape to the motor just so we can actually see it spinning here. This is just a regular old electrical tape. This is our mosfet it’s, similar to a transistor. It has a source pin on the left, where the current enters a gate pin in the middle. This acts as a switch turning on or off the current flow and on the right is our drain. Pin so where the current exits or drains off there are nine volt battery connections. It solder the ends a bit just so we can actually stick them into a breadboard connect, their lines that we can plug into. So there are five input connections on the top here and then a gap and five inputs connected on the bottom here, our connections now so the black negative wire of the 9 volt battery connects to the source of the MOSFET that’s, where the currents can enter now. Keep in mind that current flows out of the negative lead of the battery and then goes back into the positive, so it’s counterintuitive to what we’re used to but currents is actually an electrons are actually going leaving the battery on the negative terminal. First that’s why they enter the source, so this also connects to ground of our Arduino with the white wire. The middle pin of the MOSFET recall is the gate, so the gate is ours to which pin turning on or off the currents when we feed it.

A 5 volt high it’ll allow current to pass through the MOSFET and is also connected to digital pwm pin 9, which is our pulse width. Modulation, and this allows us to vary the duty cycle, we’re actually putting out from 0 to 100 output. So the right pin of the MOSFET is the drain. This is where the current exits and we’re gon na have the current exit into our DC motor using the green wire. Next up top, we have the other side of the DC motor another green wire. This is connected to the positive Y of the 9 volt battery because we are going to power the Arduino using the battery the same battery, then we’re also gon na connect the 9 volt battery to the VN pin on the Arduino, using the second red wire coming Out of the screen seen here so that’s, just gon na go into our VN, pin and provide power to the Arduino, so I’m gon na go through my code in a second, but if you’re, just looking for a basic turn on or off command. This is all the code. You need right here for pwm pin 9. Alright, so let’s take a look at the code. Now we’re gon na want to add a couple integers here, so the first integer is gon na be for the motor and we’re gon na set that on pwm pin 9 next we’re gon na make an integer 4x and just set it to 0.

For now now, we’ll need to look inside the loop and we’re gon na make a while statement. So a while statement has a simple condition which we’re gon na set as X, less than 255, which is the maximum output for the pwm pin. So all we’re gon na do this. Loop is every time it cycles, we’re gon na set X to itself plus 15. So each time X will increase. By 15, then we’re gon na make an analog, write command to the motor and feed that the variable X, which will be an integer. Now then, we’re gon na delay by one second or 1000 milliseconds make another analog write command, even though we are in a digital pin but we’re gon na set the motor so pin 9 to 0, so we’re gon na turn off the pwm pin to set it To 0 volts, then we’re gon na delay about 1. Second again and this whole loop will repeat itself a few times so 17 times in total. So the loop will cycle, and every time X is less than 255 – is going to increase X by 15 and run through the same process and we’re. Also gon na want to look at what X is in the serial port, so we’re gon na add a serial dot println command. So we can see the variable X and println recall just adds a newline every time, the output and then because we’re doing that we’re gon na need to initialize our serial port.

So we need a serial dot begin command. We’Re gon na set that speed to 9600. For the baud rate, which is pretty slow, but it should be good for our purposes here. So then we’re gon na verify the code and we’re gon na upload the code to the Arduino and see what it actually does. Music Music I’ve tried to keep this example. As basic as possible, including we’ve, omitted the flyback diode that you usually put across the motor, so the flyback diode allows current to only flow in one direction that helps to reduce any sparking that might occur as you turn on or off the switch now. For this case, we’ve kept the basic so would not use that and it still shouldn’t work for most MOSFET applications with a low power DC motor.


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Comment (39)

  1. i am little confused, what then is the use of motor driver module for arduino if we can connect the motors directly like this?

    1. The motor controller chipsets are able to do larger motors more reliably without putting strain on the Arduino itself. Also the mosfet can only do so much until it will pop and let the magic blue smoke out.

    1. You should be able to, as long as there is enough current provided to both motors.
      Even with the 9V battery it should work, but will drain the battery faster.

    1. @noah juliano You could setup 2 MOSFETs, with opposite polarities (+/-). Then control which Gate you open and which you close using 2 microcontroller digital output pins

  2. ok I want this…
    With 1 switch puch …
    1 hold switch I rotate motor clockwise
    2 puch stop motor
    3 puch rotate motor other wise…
    how do you do it??

    1. Tolson Winters
      Yup…I have done the same..
      Our project is first data is feed from Matlab to Arduino then to motor….but the program we are writing is not proper and by your approach I think that is doable…

  3. you saved my live because I was wondering how to do that for my STEM project and almost nobody else did a video that told me how to do that so thank you!!!!!

  4. Thanks for putting the camera where I can actually see what’s going on! I almost burned up my transistor following another tutorial that wasn’t as clear.

    1. @Tolson Winters My code does not control my motor for some reason, and my MOSFET keeps on getting very hot. I’ll try to replace the motor, but should the MOSFET be overheating?

    2. @Rohan Vij No, the MOSFET should not be overheating past its rated temperature. Are you using 3V and still having this issue? I would double check the wiring as well, it may be a connection issue. If you’re using a different motor it may be trying to pull more current than that MOSFET is rated for. Otherwise, the MOSFET itself may be broken or damaged already.

    3. @Tolson Winters I used a new MOSFET, and the heating reduced significantly. Before trying using 3v, I want to make sure that I have no wiring or code problems(I soldered the whole thing together, including a switch). The motor is a 1.5-3v motor. It does spin when I short the MOSFET and directly connect the source and drain, however. I’ve included an image of the setup:
      Can you help me see if I’m doing something wrong with the switch, etc?
      Thanks for all your help so far!

  5. Great video, I’ll use your circuit in a project I’m doing. The fly back diode, is there a particular type I should add? Many thanks


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