I started programming in arduino a little while ago and I now have a problem that I can not overcome:
I wanted some function that when i turn on a button the arduino press the letter "D" and waited until the button was turned off and typed "D" again. So, i want that the arduino write two times the letter "D": when i turn on the buton and when i turn off the button.
I started using this code:
#include <Keyboard.h>
void setup() {
// make pin 2 an input and turn on the
// pullup resistor so it goes high unless
// connected to ground:
pinMode(2, INPUT_PULLUP);
// initialize control over the keyboard:
Keyboard.begin();
}
void loop() {
while (digitalRead(2) == HIGH) {
// do nothing until pin 2 goes low
}
//delay(10);
// new document:
Keyboard.press('d');
delay(100);
Keyboard.release('d');
// wait for new window to open:
delay(1000);
}
But the arduino writes a lots of "D" and i didn´t figure out how to avoid the repetition of the "D" letter
I tried to adapt for a Keyboard.Press but without success
I did this:
// this constant won't change:
const int buttonPin = 2; // the pin that the pushbutton is attached to
const int ledPin = 7; // the pin that the LED 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
#include <Keyboard.h>
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) {
// if the current state is HIGH then the button
// wend from off to on:
buttonPushCounter++;
Keyboard.press('d');
delay(100);
Keyboard.release('d');
} else {
// if the current state is LOW then the button
// wend from on to off:
Keyboard.press('d');
delay(100);
Keyboard.release('d');
}
// Delay a little bit to avoid bouncing
//delay(50);
}
// save the current state as the last state,
//for next time through the loop
lastButtonState = buttonState;
// turns on the LED every four button pushes by
// checking the modulo of the button push counter.
// the modulo function gives you the remainder of
// the division of two numbers:
if (buttonPushCounter % 4 == 0) {
digitalWrite(ledPin, HIGH);
} else {
digitalWrite(ledPin, LOW);
}
}
#include <Keyboard.h>
const int buttonPin = 2; // the pin that the pushbutton is attached to
const int ledPin = 7; // the pin that the LED is attached to
int buttonState = 1; // current state of the button, HIGH as we have active low with INPUT_PULLUP
int lastButtonState = 1; // previous state of the button
void setup() {
pinMode(buttonPin, INPUT_PULLUP);
pinMode(ledPin, OUTPUT);
Serial.begin(9600);
Keyboard.begin();
}
void loop() {
buttonState = digitalRead(buttonPin);
// compare the buttonState to its previous state
if (buttonState != lastButtonState) {
if (buttonState == LOW) { // if the current state is pressed as we use INPUT_PULLUP
// wend from off to on:
Keyboard.press('d');
digitalWrite(ledPin, HIGH);
} else {
// if the current state is LOW then the button
// wend from on to off:
Keyboard.release('d');
digitalWrite(ledPin, LOW);
}
// Delay a little bit to avoid bouncing
//delay(50);
}
// save the current state as the last state,
//for next time through the loop
lastButtonState = buttonState;
}
Thanks a LOT to everyone! I changed lit bit and works fine now:
#include <Keyboard.h>
const int buttonPin = 2; // the pin that the pushbutton is attached to
const int ledPin = 7; // the pin that the LED is attached to
int buttonState = 1; // current state of the button, HIGH as we have active low with INPUT_PULLUP
int lastButtonState = 1; // previous state of the button
void setup() {
pinMode(buttonPin, INPUT_PULLUP);
pinMode(ledPin, OUTPUT);
Serial.begin(9600);
Keyboard.begin();
}
void loop() {
buttonState = digitalRead(buttonPin);
// compare the buttonState to its previous state
if (buttonState != lastButtonState) {
if (buttonState == LOW) { // if the current state is pressed as we use INPUT_PULLUP
// wend from off to on:
Keyboard.write('d');
Keyboard.release('d');
digitalWrite(ledPin, HIGH);
} else {
// if the current state is LOW then the button
// wend from on to off:
Keyboard.write('D');
Keyboard.release('D');
digitalWrite(ledPin, LOW);
}
// Delay a little bit to avoid bouncing
//delay(50);
}
// save the current state as the last state,
//for next time through the loop
lastButtonState = buttonState;
}
When tha button is turn on the arduino writes one "d" and when you turn off writes one "D".
