ECE 110/120 Honors Lab Section : Week 4: Simple Speed Controlling

/*We are trying to figure out our fist motor speed controller prototype today, we connected the circuit for the motor and speed controller but the current is too small to power the motor, we will work on current amplifier next week to fix this problem.*/

updated 

We built a simple speed controlling system, which uses the serial monitor to control the speed of the DC motor.

Problem: The current the Arduino pin provide is too small to power the motor.

Solution: We used a transistor(NPN P2N2222A) as a switch to control the larger-current circuit, where the motor is.

Note:

•  Here the diode is a flyback diode, which is used to eliminate flyback and protect the transistor.
•  We used the tutorial in adafruit.com as the guidance.

Reference:https://learn.adafruit.com/adafruit-arduino-lesson-13-dc-motors/transistors