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It doesn't matter what type of button you use. You could even use a wire and let it touch ground when you want a "press". That also would work correctly. …

Since you connected to pin to NC (normally connected), the button is connected to 3.3V when not pressed, and to nothing when pressed - and in that case the pullup resistor pulls it towards 3.3V. …

The button consists only of two contacts, which get pressed together, when you press the button. So the button can connect the pin to either ground or Vcc, but not to both. … Reading a button click: In your code you don't read the "button click", but only the state of the button. Thus you get multiple times 0 for one long enough button press. …

Depending on input events (like the user pressing the button), you do transitions between the states. I already wrote a rather detailed answer about FSMs for this question. … There you execute your current button code. When you sense a double tap on the button, you change to the DISPLAY_SPEED state. From there on a button press to the DISPLAY_CLOCK state and so on. …

You get that error, because the step() method is protected in the AccelStepper class. It is not meant for calling by the user. AccelStepper instead wants you to state, what kind of movement you want ( …

If you don't do that, your button and pulldown resistor are not connected to anything but the digital input pin. So there is nothing setting the state of that pin (HIGH or LOW). … Make sure your button and pulldown resistor are actually electrically connected to ground. Bridge any gaps in the power rails, that your breadboard might have. …

I think your problem lies in the else-if-statement, where you try to compare 3 different values. While this doesn't thrown a compiling error in my Arduino IDE, it will probably not do, what you are tr …

The transition from the first to the second state happens, when the playback button is pressed. The transition back happens, when the playback is finished. … You are already doing this in the if statement if( mode == HIGH && previous == LOW && millis() - time1 > debounce) { (it only triggers the recording of a new button, if a button was pressed and the …

To formulate the comments into an answer: In principle it is of course possible to put an encoder onto a DC motor shaft and then drive the motor, until you reach the desired position. But you won't ge …

In your code the buttons only control the direction, but are not turning the motor on or off. This is only be done with the potentiometer, which can be set to zero speed. To really enable the motor w …

state 0 do_something(); break; case 1: // state 1 do_another_thing(); break; } } Note: Depending in your target you may want to add code for button … debouncing, so that one button press is really sensed as one press, not more. …

Yes, that should be safe, as long as the button can conduct the needed current. That depends on the type of button. You can simply test this. If the button get's hot, it is too small for this. … If it should happen, that the button cannot conduct the needed current, you have 2 ways to go: Just use a bigger button. …

If yes, you measure the analog voltage, calculate the pitch and save it into the corresponding element of the pitches array: for(int button=0;button < N_BUTTONS;button++){ if(digitalRead(button_pins … [button])){ pitches[button] = analogRead(A0)/13; } } This always works for multiple pressed buttons at once. …

You can fix this by using one bottom resistor for each group of 2 buttons, each connected between 5V and the analog input/button system. …

You can connect all the buttons to a single interrupt pin by ORing them via diodes (like Gerben wrote in the comments). That would look like this: simulate this circuit – Schematic created using Ci …