Lab 3: Red/Blue blending with potentiometer
Description
For this lab, I first extended the circuit to include one potentiometer to control LED blinking speed. I then extended the circuit to include another potentiometer, and tried out code to use one pot to control blinking and one to control brightness. Since I only have two pots, I decided to write a code that uses one pot to control blinking, and the other to map an LED at full brightness each end of the range to blend two colors - when one LED is at full, the other is at zero and vice-versa.
Components Used
1 arduino uno R3 (5V)
3 220 Ω resistor
2 LED (red, blue)
8 wires (1 red, 2 yellow, 2 green, 3 orange)
2 potentiometers
1 USB cable
Code
/*
* one pot dims, the other pot changes the blinking rate
* modification of the following
* http://www.arduino.cc/en/Tutorial/AnalogInput
*/
int pot1Pin = 0; // select the input pin for the potentiometer 1
int pot2Pin = 1; // 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
int led2Pin = 11; // select the pin for the LED 2
int led1Val; // maps LED 1 brightness to one end of pot range
int led2Val; // maps LED 2 brightness to inverse end of pot range
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)/4; //converts pot max range 1024 to LED max range 255
led1Val = pot1Val; //sets LED 1 to pot value
led2Val = 255 - pot1Val; // sets LED 2 to inverse value
analogWrite(led1Pin, led1Val);
analogWrite(led2Pin, led2Val);
pot2Val = analogRead(pot2Pin); // read the value from pot 2, between 0 - 1024, for blinking
delay(pot2Val); // stop the program for some time, meaning, LED is on for this time
analogWrite(led2Pin, 0); // dim LED to completely dark (zero)
analogWrite(led1Pin, 0); // dim LED to completely dark (zero)
delay(pot2Val); // stop the program for some time, meaning, LED is OFF for this time
}
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