Arduino DC Motor Speed Control Potentiometer

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Introduction: Arduino DC Motor Speed Control Potentiometer

This instructable will guide you on how to controll the speed of a Dc motor with a potentiometer and an arduino...

Step 1: Part List

1) Arduino

2) D.C. motor

3) NPN transistor TIP120

4) Rectifier Diode

5) 3* 220 ohms resitors

6) 10K Potentiometer

7) Breadboard

8) Jumper wires

9) Green led

10) Red led

11) Computer with Arduino IDE

Step 2: Connect the Potentiometer

1) Connect the negative pin of the potentiometer to GNDPIN on the arduino.

2) Connect the signal pin of the potentiometer to AnalogPIN0 on the arduino.

3) Connect the positive pin of the potentiometer to 5VPIN on the arduino.

Step 3: Connect the Leds

1) Connect a 220ohm or any ressitor below 1komhs to the anode of the red led and connect the end of the resistor to DIGITALPIN8 on the arduino.

2) Connect the cathode of the red led to GNDPIN.

3) Connect a 220ohms resistor to the anode of the green led and connect the end of the resistor to DIGITALPIN9 on the arduino.

4) Connect the cathode of the green led to GNDPIN.

Step 4: Connect the Transistor,diode,resistor and the D.C.motor

1) Connect the BASE of the transistor to a 220ohms resitor and connect the end of the resistor to DIGITALPIN3 on the arduino.

2) Connect the COLLECTOR of the transistor to a negative of a diode and connect the end of the diode to GND.

3) Connect the EMITTER of the transistor to GND.

4) Connect a pin of the motor to 5v and another to negative of the Diode.

Step 5: TIP 120 NPN Transistor Pinout

Step 6: Breadboard Layout

Step 7: Arduino Code

int analogInPin = A0;

int sensorValue = 0;

int outputValue = 0;

int transistorPin = 3;

void setup()

{

Serial.begin(9600);

pinMode(8, OUTPUT);

pinMode(9, OUTPUT);

pinMode(transistorPin, OUTPUT);

}

void loop()

{

sensorValue = analogRead(analogInPin)/4;

outputValue = map(sensorValue, 0, 1023, 0, 255);

analogWrite(transistorPin, sensorValue);

if (sensorValue >= 160)

{

//example

digitalWrite(8, HIGH);

digitalWrite(9, LOW);

}

else

{ digitalWrite(9, HIGH);

digitalWrite(8, LOW);

}

delay(10); }

Step 8: You're Done!!

2 People Made This Project!

  • what happens if you ...-BENLochocki

    BENLochocki made it!

  • It works?Which is al...-NappaG

    NappaG made it!

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20 Comments

Do you have Proteus Simulation of this Project ... ? I need to simulate this circuit in Proteus ?

I might have read it wrong but the diode should go in parallel with the motor. Cathode (negative end) to voltage source (same connection motor pos) and anode (positive end) to the collector on the bjt. The diode provides a place for current to do when power is cut off. This circuit works (doesn't break) due to the low current, voltage, small motor, and durability of the arduino. A motor acts like an inductor and when current stops flowing an inductor tries creating a current, the current it creates has to go somewhere.

surya bhaii.....I have to do the same thing with my Raspberry Pi.....can u tell how to do?

Find me on fackebook

https://www.facebook.com/profile.php?id=100009289167675 and we will discuss there :D

Thanks for replying mate! I actually have been able to do this with my Raspi. Anyways, thanks for this lovely instructable!

Another nicely done Instructable.

Thanks

does the voltage on the motor matter

Hello sir. I have a question. We have a project called jar tester and it runs on a 24v dc motor. We want to control its speed but at the same time display the rpm accordingly. How can it be done sir? thanks ahead.