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arduino:arduino_crash_course:basic_interaction

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arduino:arduino_crash_course:basic_interaction [2012/11/03 21:12] – [Polling versus interrupts] mithatarduino:arduino_crash_course:basic_interaction [2012/11/05 22:16] – [Using internal pullups] mithat
Line 29: Line 29:
 int pushButtonPin = 2;  // connect the push button to digital pin 2 int pushButtonPin = 2;  // connect the push button to digital pin 2
 int ledPin = 13;        // connect the LED to pin 13 int ledPin = 13;        // connect the LED to pin 13
 +int buttonState;        // stores current button state 
  
 void setup() { void setup() {
Line 36: Line 37:
  
 void loop() { void loop() {
-  int buttonState = digitalRead(pushButtonPin);  // read the input pin+  buttonState = digitalRead(pushButtonPin);  // read the input pin
  
     // set LED state accordingly     // set LED state accordingly
Line 61: Line 62:
 int pushButtonPin = 2;  // connect the push button to digital pin 2 int pushButtonPin = 2;  // connect the push button to digital pin 2
 int ledPin = 13;        // connect the LED to pin 13 int ledPin = 13;        // connect the LED to pin 13
 +int buttonState;        // stores current button state 
  
 void setup() { void setup() {
Line 68: Line 70:
  
 void loop() { void loop() {
-  int buttonState = digitalRead(pushButtonPin);  // read the input pin+  buttonState = digitalRead(pushButtonPin);  // read the input pin
   digitalWrite(ledPin, buttonState);             // turn the LED on or off   digitalWrite(ledPin, buttonState);             // turn the LED on or off
   //delay(1);        // delay in between reads for stability (?)   //delay(1);        // delay in between reads for stability (?)
Line 85: Line 87:
 int pushButtonPin = 2;  // connect the push button to digital pin 2 int pushButtonPin = 2;  // connect the push button to digital pin 2
 int ledPin = 13;        // connect the LED to pin 13 int ledPin = 13;        // connect the LED to pin 13
 +int buttonState;        // stores current button state 
  
 void setup() { void setup() {
Line 117: Line 120:
 int pushButtonPin = 2;  // connect the push button to digital pin 2 int pushButtonPin = 2;  // connect the push button to digital pin 2
 int ledPin = 13;        // connect the LED to pin 13 int ledPin = 13;        // connect the LED to pin 13
 +int buttonState;        // stores current button state 
  
 void setup() { void setup() {
Line 125: Line 129:
  
 void loop() { void loop() {
-  int buttonState = digitalRead(pushButtonPin);  // read the input pin+  buttonState = digitalRead(pushButtonPin);  // read the input pin
  
   // set LED state accordingly   // set LED state accordingly
-  // note the inverted logic+  // becasue we are using pullup resistors, the logic is inverted; 
 +  // in other words, pressed produces LOW, un-pressed produces HIGH.
   if (buttonState == LOW)        // if the button is pushed   if (buttonState == LOW)        // if the button is pushed
     digitalWrite(ledPin, HIGH);  // turn the LED on     digitalWrite(ledPin, HIGH);  // turn the LED on
Line 145: Line 150:
 int pushButtonPin = 2;  // connect the push button to digital pin 2 int pushButtonPin = 2;  // connect the push button to digital pin 2
 int ledPin = 13;        // connect the LED to pin 13 int ledPin = 13;        // connect the LED to pin 13
 +int buttonState;        // stores current button state 
  
 void setup() { void setup() {
Line 153: Line 159:
  
 void loop() { void loop() {
-  int buttonState = !digitalRead(pushButtonPin);  // read the input pin +  buttonState = digitalRead(pushButtonPin);  // read the input pin 
-  digitalWrite(ledPin, buttonState);              // turn the LED on or off+  
 +  // Bbcasue we are using pullup resistors, the logic is inverted; 
 +  // in other words, pressed produces LOW, un-pressed produces HIGH. 
 +  digitalWrite(ledPin, !buttonState);        // turn the LED on or off
 } }
 </file> </file>
arduino/arduino_crash_course/basic_interaction.txt · Last modified: 2017/12/06 01:05 by mithat
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