Assignment: Sensing: Potentiometers

Collaborators:

Assignment: Sensing: Potentiometers
Collaborators:

Assignment: Sensing: Potentiometers
Collaborators:

2 Pots, 1 LED

Description

Use two pots as analog input to control a single LED output. One pot controls brightness, the second pot controls blinking speed. In the attached images, there are 3 LEDs plugged in the breadboard leftover from the previous assignment, but only 1 is active and turned on.

Components Used

• Light Emitting Diode (LED)
• 220Ohm Resistor
• 2 Potentiometers

Arduino Code

/*
 * one pot dims, the other pot changes the blinking rate
 * modification of the following
 * http://www.arduino.cc/en/Tutorial/AnalogInput
 */
int pot1Pin = 1;   // select the input pin for the potentiometer 1
int pot2Pin = 2;   // select the input pin for the potentiometer 2
int pot1Val = 0;   // variable to store the value coming from pot 1
int pot2Val = 0;   // variable to store the value coming from pot 2 
int led1Pin = 9;   // select the pin for the LED 1

void setup() {
   pinMode(led1Pin, OUTPUT);  // declare the led1Pin as an OUTPUT
   pinMode(led2Pin, OUTPUT);  // declare the led2Pin as an OUTPUT
}
void loop() {
   pot1Val = analogRead(pot1Pin);   // read the value from pot 1, between 0 - 1024, for dimming
   pot2Val = analogRead(pot2Pin);   // read the value from pot 2, between 0 - 1024, for blinking
   analogWrite(led1Pin, pot1Val/4); // dim LED to value from pot1
   delay(pot2Val);                  // stop the program for some time, meaning, LED is on for this time
   analogWrite(led1Pin, 0);         // dim LED to completely dark (zero) 
   delay(pot2Val);                  // stop the program for some time, meaning, LED is OFF for this time
}

Item