Assignment: Input / Output Coincidence Lab Assignment

Collaborators:

Description

Use the FSR to behave as a button that when pressed, turns on the LED. pressed again dims to medium. pressed again dims to low. and pressed a final time dims to off. further presses cycles through this process.

Components Used

• Light Emitting Diode (LED)
• FSR

Arduino Code

/*
 * FSR acts as a "button" to dim an LED similar to a dimming bedside night lamp. First turns on, then dims to medium,
 * then dims to low, then turns off, and repeats every time button is pressed long enough
 * modified version of AnalogInput
 * by DojoDave <http://www.0j0.org>
 * http://www.arduino.cc/en/Tutorial/AnalogInput 
 * adapted by Kurt Sookwongse
 */
int fsrPin = 2;   // select the input pin for the fsr
int ledPin = 9;   // select the pin for the LED
int val = 0;      // variable to store the value coming from the sensor
int currentbrightness = 0; //variable to store current value being sent to ledPin
int newbrightness = 0;// variable to store new value to write to ledPin

int count = 0;      // variable to count continuous cycles FSR has been pressed
int off = 0;        //various possible brightness levels for LED (0-255)
int low = 20;
int medium = 100;
int full = 255;

void setup() {
 Serial.begin(9600);
}
void loop() {
 val = analogRead(fsrPin);    // read the value from the sensor, between 0 - 1024
 Serial.println(val);
 
 if(val < 10) {count=0;}
 else {count += 1;}      //update how long pressure sensor has been pressed continuously
 
 if (count == 100){    //cycle to next brightness level if button has been pressed long enough
 if(currentbrightness == off) newbrightness = full;    
 if(currentbrightness == full) newbrightness = medium;
 if(currentbrightness == medium) newbrightness = low;
 if(currentbrightness == low) newbrightness = off;
 analogWrite(ledPin, newbrightness); // analogWrite can be between 0-255, write newbrightness
 currentbrightness=newbrightness;    // update currentbrightness
 }
}