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I am currently working on a DIY controller for Train Sim World. I am relatively new to the Arduino and the C programming language. My code is structured to look for button presses or PS2 joystick inputs and print a specific character for each button. I have also included a kill switch on pin 3. However when I run the code and open Notepad to see the results, the Arduino keeps printing the = character even if pin 3 is not pulled low. After I pull pin 3 low and press a button, there is a delay of about two seconds during which the = character keeps being printed over and over again, and after these 2 seconds elapse the Arduino prints the character attributed to the button several times before returning to printing = over and over again.

What can I do to fix this?

#include <Keyboard.h>

void setup() {
    pinMode(0, INPUT_PULLUP);
    pinMode(1, INPUT_PULLUP);
    pinMode(2, INPUT_PULLUP);
    pinMode(3, INPUT_PULLUP);
    pinMode(4, INPUT_PULLUP);
    pinMode(5, INPUT_PULLUP);
    pinMode(6, INPUT_PULLUP);
    pinMode(7, INPUT_PULLUP);
    pinMode(8, INPUT_PULLUP);
    pinMode(9, INPUT_PULLUP);
    pinMode(10, INPUT_PULLUP);
    pinMode(11, INPUT_PULLUP);
    pinMode(12, INPUT_PULLUP);
    pinMode(13, INPUT_PULLUP);
}
bool pantograph = 0;
void loop() {
    while (digitalRead(3) == LOW) {
        Keyboard.write("M");
        if (digitalRead(1) == LOW) {
            Keyboard.write("W");
        } else if (digitalRead(2) == LOW) {
            Keyboard.write("S");
        } else if (digitalRead(0) == LOW) {
            Keyboard.write("Q");
        } else if (digitalRead(5) == LOW) {
            Keyboard.write("Y");
        } else if (digitalRead(6) == LOW) {
            Keyboard.write("T");
        } else if (digitalRead(7) == LOW) {
            Keyboard.write("G");
        } else if (digitalRead(8) == LOW) {
            Keyboard.write("K");
        } else if (digitalRead(9) == LOW) {
            Keyboard.write("Z");
        } else if (digitalRead(10) == LOW) {
            if (pantograph == 0) {
                Keyboard.write("P");
            } else {
                Keyboard.write("O");
            }
        } else if (digitalRead(11) == LOW) {
            Keyboard.write(9);
        } else if (digitalRead(12) == LOW) {
            Keyboard.write("N");
        } else if (digitalRead(13) == LOW) {
            Keyboard.write(32); 
        } else if (analogRead(A0) > 700) {
            Keyboard.write(93);
        } else if (analogRead(A0) < 200) {
            Keyboard.write(91);
        } else if (analogRead(A1) > 700) {
            Keyboard.print(39);
        } else if (analogRead(A1) < 200) {
            Keyboard.print(59);
        } else if (analogRead(A2) > 700) {
            Keyboard.print("A");
        } else if (analogRead(A2) < 200) {
            Keyboard.print("D");
        }
    }
    delay(1000);
}

migrated from stackoverflow.com Nov 27 '18 at 17:41

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  • I'm not sure if it'd cause it but I think you should have a Keyboard.begin() at the end of the setup function. – PeterJ Nov 18 '18 at 5:22
  • @PeterJ unfortunately it didn't work. Same thing happens as I've described before. However by moving the delay inside while the program slows down to printing once every second, as expected, and the buttons' associated characters only print once, but the program still prints the "=" over and over again – Luca T Nov 18 '18 at 6:24
  • did you read my answer? – Juraj Nov 27 '18 at 18:15
1

The method write with one parameter takes char not string. Use write('W'), not write("W");

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