Connecting an N-Channel MOSFET

Control a brushless DC fan with an N-Channel MOSFET.

May 11, 2019

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Project description

Code

MOSFETcontrol

arduino

MOSFETcontrol

arduino

Downloadable files

circuit_schematic_LIpuLQMNZS.png

circuit_schematic_LIpuLQMNZS.png

Comments

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bakedgoods

6 months ago

Very late to the party, but I just wanted to say that yes the wiring diagram is wrong; but only for the common MOSFETs like IRF520 and IRF44ZN which both have Gate - Drain - Source. But the MOSFET that they have used in this configuration (as is also mentioned in their tutorial) is a 2N7000 MOSFET, that does in fact have a Source - Gate - Drain, which makes their wiring diagram correct.

Anonymous user

2 years ago

The wiring diagram is wrong.

Anonymous user

2 years ago

It is, but let's also provide the correct info then :) The MOSFET is wired incorrectly. The pinout on a MOSFET is (from left to right, looking at the printed side of the MOSFET) gate - drain - source. MOSFET left pin (gate) to Arduino pin 2. MOSFET middle pin (drain) to fan. MOSFET right pin (source) to ground. Also the fan needs to be powered, so an additional connection from Arduino 5V to the red rail on the breadboard is needed. HTH

Anonymous user

2 years ago

As a beginner this tutorial is an absolute mess! Wiring digram ist totally wrong-- to an extend which boarders on malicious intend. I just lost 4 hours and an arduino over this..... Why is this the first google result for ardunio + mosfet?? this tutorial should be deleted

Anonymous user

2 years ago

Agreed - it contains several errors and should be removed.

Anonymous user

2 years ago

The gate won't try to pull more than 40mA. In fact it won't try to pull any current. A MOSFET is a voltage controlled device, not current controlled. The Gate current is always Zero in a MOS transistor because the gate terminal is isolated from substrate by a dielectric medium. MOSFET is formed by a MOS CAPACITOR which is always in equilibrium under all conditions, so no gate current can pass through it.

Anonymous user

3 years ago

As a beginner this tutorial is an absolute mess! Wiring digram ist totally wrong-- to an extend which boarders on malicious intend. I just lost 4 hours and an arduino over this..... Why is this the first google result for ardunio + mosfet?? this tutorial should be deleted

kallend

2 years ago

Agreed - it contains several errors and should be removed.

Anonymous user

4 years ago

The gate won't try to pull more than 40mA. In fact it won't try to pull any current. A MOSFET is a voltage controlled device, not current controlled. The Gate current is always Zero in a MOS transistor because the gate terminal is isolated from substrate by a dielectric medium. MOSFET is formed by a MOS CAPACITOR which is always in equilibrium under all conditions, so no gate current can pass through it.

Anonymous user

5 years ago

The wiring diagram cannot be accessed at the moment. Also, shouldn't there be a diode across that inductive load ?

Anonymous user

2 years ago

It IS generally a good idea to put a flyback diode over an inductive load, but I can imagine with this small fan this could be fine as well.

Anonymous user

5 years ago

The wiring diagram is wrong.

Anonymous user

2 years ago

It is, but let's also provide the correct info then :) The MOSFET is wired incorrectly. The pinout on a MOSFET is (from left to right, looking at the printed side of the MOSFET) gate - drain - source. MOSFET left pin (gate) to Arduino pin 2. MOSFET middle pin (drain) to fan. MOSFET right pin (source) to ground. Also the fan needs to be powered, so an additional connection from Arduino 5V to the red rail on the breadboard is needed. HTH

ejshea

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