Arduino
Version vom 22. Oktober 2019, 15:54 Uhr von LEikenbusch (Diskussion | Beiträge) (→Verbinde Arduino mit einem Knopf und zähle, wie oft der Knopf gedrückt wird)
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Verbinde Arduino mit einem Knopf und zähle, wie oft der Knopf gedrückt wird
State change detection (edge detection) Often, you don't need to know the state of a digital input all the time, but you just need to know when the input changes from one state to another. For example, you want to know when a button goes from OFF to ON. This is called state change detection, or edge detection. This example shows how to detect when a button or button changes from off to on and on to off and how to count these changes. The circuit: - pushbutton attached to pin 2 from +5V - 10 kilohm resistor attached to pin 2 from ground by Tom Igoe This example code is in the public domain. http://www.arduino.cc/en/Tutorial/ButtonStateChange // this constant won't change: const int buttonPin = 2; // the pin that the pushbutton is attached to // Variables will change: int buttonPushCounter = 0; // counter for the number of button presses int buttonState = 0; // current state of the button int lastButtonState = 0; // previous state of the button void setup() { // initialize the button pin as a input: pinMode(buttonPin, INPUT); // initialize the LED as an output: //pinMode(ledPin, OUTPUT); // initialize serial communication: Serial.begin(9600); } void loop() { // read the pushbutton input pin: buttonState = digitalRead(buttonPin); // compare the buttonState to its previous state if (buttonState != lastButtonState) { // if the state has changed, increment the counter if (buttonState == HIGH) { //increase the buttonState by 1 buttonState++; // if the current state is HIGH then the button went from off to on. Serial.println("on"); Serial.print("number of button pushes: "); Serial.println(buttonPushCounter); } else { // if the current state is LOW then the button went from on to off: Serial.println("off"); Serial.println(" "); } // Delay a little bit to avoid inaccurate counting. delay(50); } // save the current state as the last state, for next time through the loop lastButtonState = buttonState; }
Führe eine Funktion einmalig aus, wenn ein Button gedrückt ist, und einmalig etwas anderes, wenn er losgelassen wird
int buttonDown =0; int inputPin = 5; //hier muss der Pin eingetragen sein, an dem der Button hängt [...] void loop(){ if (digitalRead(inputPin)==LOW){ buttonDown++; } if (buttonDown==1){ DoSomethingOnceWhenPressed(); } if (digitalRead(inputPin)==HIGH && buttonDown>0){ DoSomethingOnceWhenReleased(); buttonDown=0; } }
Mache etwas alle x-Durchläufe
int loopCounter=0; int alleXLoops = 15; //Führt eine Funktion alle 15 loops aus [...] void loop(){ loopCounter++; if (loopCounter%alleXLoops==0){ DoSomethingEveryXLoops(); } }