Something is wrong with my code which the timer seems not working (saving the time when the button was pressed) and calculate the time difference ("current time" - "time when button pressed") in order to lights up the LED. When the button was released at anytime, all LEDs would be off. In the setup pin 2 is initialized as follows: pinMode(2, INPUTPULLUP) A button click can be defined as a button press followed by a button release. So 7s after the button was pressed and hold, all 8 LEDs shall light up. One end of the button is connected to pin 2 and the other end of the button is connected to GND of an Arduino Uno microcontroller board. When the button was released at anytime, all LEDs would be off. There are 8 LED lights in total, when the toggle button was pressed, 1st LED lights up keep holding/ pressing the button, the 2nd LED lights up after 1sec, the 3rd LED lights up after 2sec and so on. Compile and upload code to ESP32 board by clicking Upload button on Arduino IDE. The reason why you’d use one over the other depends on the components you’re going to connect. For this circuit, we will need to use the 5V rail. Arduino Uno can output two levels of power, 3-Volts and 5-Volts. So 7s after the button was pressed and hold, all 8 LEDs shall light up. If you want to turn on the LED then let it remain ON at the button release you just need to get rid of the else statement (as you can see in sketch 2, but you. Copy the above code and paste it to Arduino IDE. Begin by placing the push button and connecting it with the power jumpers from the Arduino board. There are 8 LED lights in total, when the toggle button was pressed, 1st LED lights up keep holding/ pressing the button, the 2nd LED lights up after 1sec, the 3rd LED lights up after 2sec and so on. In my project, I am trying to create a timer display with LEDs base on how long a button was pressed and hold.
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