Description:

I chose to build a visual feedback system for the DC Motor output. I used 3 LED's whose blinking indicated the output of the motor. When the motor has upto 1/3rd output, only the green LED blinks slowly. When the motor has 1/3rd to 2/3rd output, the green and blue LED's blink faster than before. When the motor has 2/3rd to full output, all three LED's blink very fast.

Components:

3 LED's - Blue, Green and Red

DC Motor

2 AA Batteries

Code:

/*
* one pot fades one motor
* modified version of AnalogInput
* by DojoDave <http://www.0j0.org>
* http://www.arduino.cc/en/Tutorial/AnalogInput
* Modified again by dave
*/

int potPin = 0; // select the input pin for the potentiometer
int motorPin = 9; // select the pin for the Motor
int val = 0; // variable to store the value coming from the sensor
int ledpin1 = 13;
int ledpin2 = 12;
int ledpin3 = 11;
int num = 0;

void setup() {
Serial.begin(9600);
pinMode(ledpin1, OUTPUT);
pinMode(ledpin2, OUTPUT);
pinMode(ledpin3, OUTPUT);
}
void loop() {
val = analogRead(potPin); // read the value from the sensor, between 0 - 1024
Serial.println(val/4);
analogWrite(motorPin, val/4); // analogWrite can be between 0-255
num = val/4;
if (num > 0 and num < 85) {
digitalWrite(ledpin1, HIGH);
delay(1000);
digitalWrite(ledpin1,LOW);
delay(1000);
}
if (num >84 and num <170) {
digitalWrite(ledpin1, HIGH);
digitalWrite(ledpin2, HIGH);
delay(500);
digitalWrite(ledpin1,LOW);
digitalWrite(ledpin2,LOW);
delay(500);
}
if (num >169) {
digitalWrite(ledpin1, HIGH);
digitalWrite(ledpin2, HIGH);
digitalWrite(ledpin3, HIGH);
delay(100);
digitalWrite(ledpin1,LOW);
digitalWrite(ledpin2,LOW);
digitalWrite(ledpin3,LOW);
delay(100);
}

}

Images:

DC Motor Output with LED's

Video Link: