Assignment: Sensing: Potentiometers
Collaborators:
Assignment: Sensing: Potentiometers
Collaborators:
Assignment: Sensing: Potentiometers
Collaborators:
Description:
In this lab I learned how to use potentiometers. I used them to control brightness and blinking of the
LEDs.
Materials Used:
3 pots
3 LEDs
assorted wires
3 resistors
Option 1:
One pot controls brightness, another pot controls blinking
As instructed, I accomplished this through use of the http://www.arduino.cc/en/Tutorial/AnalogInput Code.
(It is modestly modified...but overall I take no credit for the code...although I do follow what it
does.)
/*
* 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
void setup() {
pinMode(led1Pin, OUTPUT); // declare the led1Pin as an OUTPUT
pinMode(led2Pin, OUTPUT); // declare the led2Pin as an OUTPUT
}
void loop() {
//get analog input
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
//use the analog input to manipulate the LED
analogWrite(led2Pin, pot1Val/4); // dim LED to value from pot1 (divide by four to convert to 0-255)
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
}
Option 2:
3 Pots for 3 LEDs (each pot controls brightness of RGB Hue / colors)
I took out the error checking etc because I don't use it.
/*
* Adapation of "Coffee-cup" Color Mixer:
*
*/
// Analog pin settings
int aIn = 0; // Potentiometers connected to analog pins 0, 1, and 2
int bIn = 1; // (Connect power to 5V and ground to analog ground)
int cIn = 2;
// Digital pin settings
int aOut = 9; // LEDs connected to digital pins 9, 10 and 11
int bOut = 10; // (Connect cathodes to digital ground)
int cOut = 11;
// Values
int aVal = 0; // Variables to store the input from the potentiometers
int bVal = 0;
int cVal = 0;
// Variables for comparing values between loops
int i = 0; // Loop counter
int wait = (1000); // Delay between most recent pot adjustment and output
int checkSum = 0; // Aggregate pot values
int prevCheckSum = 0;
int sens = 3; // Sensitivity theshold, to prevent small changes in
// pot values from triggering false reporting
// FLAGS
int PRINT = 1; // Set to 1 to output values
int DEBUG = 1; // Set to 1 to turn on debugging output
void setup()
{
pinMode(aOut, OUTPUT); // sets the digital pins as output
pinMode(bOut, OUTPUT);
pinMode(cOut, OUTPUT);
Serial.begin(9600); // Open serial communication for reporting
}
void loop()
{
i += 1; // Count loop
aVal = analogRead(aIn) / 4; // read input pins, convert to 0-255 scale
bVal = analogRead(bIn) / 4;
cVal = analogRead(cIn) / 4;
analogWrite(aOut, aVal); // Send new values to LEDs
analogWrite(bOut, bVal);
analogWrite(cOut, cVal);
}
Extra point:
Come up with an interesting mapping between the rotational position pot and LED output.
/*
* Adapation of "Coffee-cup" Color Mixer:
* The LED acts as an indicator (zero, dim, medium and bright)
* Rotating the pot will place the LED at one of four possible levels, rather than dimming on a gradient
*
*/
// Analog pin settings
int aIn = 0; // Potentiometers connected to analog pins 0, 1, and 2
int bIn = 1; // (Connect power to 5V and ground to analog ground)
int cIn = 2;
// Digital pin settings
int aOut = 9; // LEDs connected to digital pins 9, 10 and 11
int bOut = 10; // (Connect cathodes to digital ground)
int cOut = 11;
// Values
int aVal = 0; // Variables to store the input from the potentiometers
int bVal = 0;
int cVal = 0;
// Variables for comparing values between loops
int i = 0; // Loop counter
int wait = (1000); // Delay between most recent pot adjustment and output
int checkSum = 0; // Aggregate pot values
int prevCheckSum = 0;
int sens = 3; // Sensitivity theshold, to prevent small changes in
// pot values from triggering false reporting
// FLAGS
int PRINT = 1; // Set to 1 to output values
int DEBUG = 1; // Set to 1 to turn on debugging output
void setup()
{
pinMode(aOut, OUTPUT); // sets the digital pins as output
pinMode(bOut, OUTPUT);
pinMode(cOut, OUTPUT);
Serial.begin(9600); // Open serial communication for reporting
}
void loop()
{
i += 1; // Count loop
//we are going to play stop light
aVal = analogRead(aIn) / 4; // read input pins, convert to 0-255 scale
bVal = analogRead(bIn) / 4;
cVal = analogRead(cIn) / 4;
//a
if ( aVal> 0 && aVal<85) {
analogWrite(aOut, 43); // Send new values to LED
}
else if (aVal> 85 && aVal<170) {
analogWrite(aOut, 128); // Send new values to LED
}
else if (aVal>170 && aVal<255){
analogWrite(aOut, 213); // Send new values to LEDs
}
//b
if ( bVal> 0 && bVal<85) {
analogWrite(bOut, 43); // Send new values to LED
}
else if (bVal> 85 && bVal<170) {
analogWrite(bOut, 128); // Send new values to LED
}
else if (bVal>170 && bVal<255){
analogWrite(bOut, 213); // Send new values to LEDs
}
//c
if ( cVal > 0 && cVal < 85) {
analogWrite(cOut, 43); // Send new values to LED
}
else if (cVal > 85 && cVal < 170) {
analogWrite(cOut, 128); // Send new values to LED
}
else if (cVal > 170 && cVal < 255){
analogWrite(cOut, 213); // Send new values to LEDs
}
}
