Keyestudio ARDUINO maker learning kit, Manual

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// the loop function runs over and over again forever
void loop() {
digitalWrite(3, HIGH); // turn the LED on (HIGH is the voltage level)
delay(2000); // wait for a second
digitalWrite(3, LOW); // turn the LED off by making the voltage LOW
delay(3000); // wait for a second
}
//////////////////////////////////////////////////////////
Result
Motor rotates for 2 seconds, and stops for 3 seconds, then cycles on.
Experiment Principle:
The characteristics of NMOS is that when Vgs is greater than a certain value, it will be conducted.
It is suitable for use in situation when source electrode is connected to ground (low-end driving),
as long as the grid voltage reaches 4V to 10V. When G electrode is connected to digital port 3, s
electrode to GND and digital port 3 output is HIGH, Vgs is 5V, meeting the requirement, DS is
conducted, motor rotates. When digital port output is LOW, Vgs is 0 v, not meeting the
requirements, DS is disconnected, motor stops running.
In this experiment, by controlling the output of digital port 3 to control Vgs voltage and then
controling the conduction and disconnection of DS electrode to control the rotation of the motor.
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Project 33: 4N35
Introduction
4N35 is a general photoelectric coupler, containing a gallium arsenide infrared LED, and use the
LED to drive silicon photoelectric transistor diode. The package of 4N35 is 6-pin dual-in-line
Package.
Hardware required
4n35 *1
1KΩ resistor *1
220Ω resistor *2
Red M5 LED *1
Breadboard *1
Breadboard jumper wires *several
Schematic diagram