Arduino while loop button8/28/2023 ![]() ![]() If you need any more information just let me know. But when you press the buton again it will start. It will no longer say "hi" in the console.īut maybe you guys ( or girls) can help my make the code so when I press the button it stops. I am now using this to print "hi" to the console if the button has not been pressed, but if the button has been pressed. My question is is there a way to start or stop a loop when you press a button. So just upload the below code and press the buttons to see the output.I am just starting with arduino so I am doing this wrong please let me know. The circuit for this example is the same as the above circuit. I will use two buttons, one button will increase the frequency and another button will decrease the frequency of the blinking LED. In this section, I will show you how you can change the frequency of a blinking LED with a button press. Int currentState1, currentState2 // the current reading from the input pin Int pushCounter = 0 // counter for the number of button presses Int lastState1 = HIGH // the previous state from the input pin It will just print hi over and over again until test becomes 1 Or greater and that will never ever happen since nothing in that while loop ever changes the value of test. You cant do that if the code is stuck in that while loop. Connect the LED +ve pin to Arduino pin 9 and the -ve pin to the ground using a current limiting resistor (220 Ω).Ĭonst int buttonPin1 = 12 // Increment ButtonĬonst int buttonPin2 = 13 // Decrement Button What do you mean works fine I thought you wanted to be able to press the button again to stop it. Connect the two buttons input to the Arduino pin 12 and 13. Here you need to make a small circuit like below. One button will increase the brightness and another will decrease the brightness of the LED. In this section, I will use two buttons to control the brightness of an LED. If (lastState = HIGH & currentState = LOW) Control The Brightness of an LED using Buttons The below code will toggle an LED every time the button is pressed. Just upload the below code, press the button multiple times and see how it works. This example will work on the previous circuit. You can use that event to control many things. That means it will only detect the button press, not the button release. The below code will detect the point when the button output goes from HIGH to a LOW state. In this section, I will show you how to detect the push button state change. Now upload the below code and press the button. The button is connected to Arduino pin number 13. ![]() LED’s +ve pin is connected to the Arduino pin number 9 and the ground pin is connected to the ground through a 220 Ω current limiting resistor. You can see that I connect an LED and a button with the Arduino. The LED will turn off when you release the button.įor this example, you need to make a small circuit like below. The LED will turn on when you press the button and it will remain on as long as you hold the button. In this section, I will show you how to detect the button state. Showing that delay (1000) is not optimal for button handling. ![]() Inside the while loop buttonState will never change, thus you have a while forever Simply change it to an if and your sketch will behave better. In the below sections, I will use all three cases with different examples. 1 Answer Sorted by: 0 A while inside loop is always suspicious, and you provide a good example. ![]() If you want to toggle the LED between ON and OFF with each button press then you need to detect the button state change.Īnd if you want to increase or decrease the brightness of an led or if you want to control multiple led using one button you will need to count the button press. If you want a LED to be ON when the button is pressed and OFF when the button is not pressed then you need to detect the button state only. Push buttons have mainly three widely used cases – ![]()
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