Week 3 Lab
One pot controls brightness, another pot controls blinking
Description: Use one pot to control a LED's brightness and the other to control its blinking speed.
Components Used: LED, Resistors, Potentiometers
Photo: Attached
Source 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
int led2Pin = 10; // select the pin for the LED 2
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(led2Pin, pot1Val/4); // dim LED to value from pot1
delay(pot2Val); // stop the program for some time, meaning, LED is on for this time
analogWrite(led2Pin, 0); // dim LED to completely dark (zero)
delay(pot2Val); // stop the program for some time, meaning, LED is OFF for this time
}
Extra Point: Combination Lock
Description: This is a combination lock that lights up when a user gets two numbers right.
Components Used: LED, Resistors, Potentiometers
Photo: Attached
Source Code:
/*
* It's a lock that gives you light only when it gets two numbers right.
*/
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 lock1Val = 300; // secret number for lock 1
int lock2Val = 800; // secret number for lock 2
int led1Pin = 9; // select the pin for the LED 1
int led2Pin = 10; // select the pin for the LED 2
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
if(abs(pot1Val-lock1Val)<100 && abs(pot2Val-lock2Val)<100)
{
analogWrite(led2Pin, 100); // dim LED to value from pot1
analogWrite(led1Pin, 100);
}else{
analogWrite(led2Pin, 0); // dim LED to completely dark (zero)
analogWrite(led1Pin, 0);
}
}
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