PinMode(button,INPUT) //set the button as an inputĭigitalWrite(button, HIGH) //enable internal pullup resistor Int buttonState = 1 //variable to hold the state of the button Int buttonCount = 0 //variable to hold the button presses The button must be pressed 5 times to moveĬonst int button = 5 //attach the button on pin 5 * This code is to show how a digital input can move through cases Since these are just test programs, you can leave the board plugged into the computer so the Arduino can receive power. See the code below, then upload it to see how it works before moving to the next step. Watch the serial monitor to see when the program is done. Once it has been held for 5 seconds, we'll move to the next state. In the first case, we'll use a counter to store how long the button has been pressed. We'll use a button to trigger the movement to the next state. Now that we know the basics of a switch statement, we can add in a basic digital input. ProgramCount = 0 //start at the beginning Serial.begin(9600) // initialize serial communication: Int programCount = 0 //variable to move through the program To 10 in the serial monitor using a delay. * This code is to show the basic workings of a switch statement. See the attached code, read the comments, and upload it to see how it works before moving on. The switch statement sits in each case until 1 second has passed, then moves to the next. By watching the serial monitor, you can see the program count to 5 over 5 seconds. There is also a default case, so that you can put a section of the program to happen when the variable you are watching does not match one of the programmed cases.įor the first example, we'll have a passive code. This property makes it very easy to make a program pointer that will move through your code, applying all the appropriate inputs and outputs at the correct time. The basics of the switch() statement is that you watch a variable, and depending what the variable's value is, a different case in the switch() is activated. Also, in the future if you want to change the LED from pin 8 to pin 11 for example, you can modify this line without touching anything else in the code.Before we dive into the coding, we need to understand what we are working with. That way, if you have used different pins than I, you just need to modify those 2 lines. Setup #define LED_PIN 8įirst, as a best practice, we use some defines to keep the pin number for the LED and push button. And when we press the button the LED should be on. What we want to achieve is simple: when the button is not pressed, the LED is off. Turn on the LED when button is pressed, turn it off otherwise Finally, connect a leg of the button (same side as the pull down resistor) to a digital pin (here 7).Īll right your circuit is now finished.Add a red wire between another leg of the button and VCC (5V).This resistor will act as a “pull down” resistor, which means that the default button’s state will be LOW. Connect one leg of the button to the ground, and put a 10k Ohm resistor in between.Add the push button to the breadboard, like in the picture.Add a 220 Ohm resistor in between to limit the current going through the LED. Connect the longer leg of the LED to a digital pin (here pin no 8, you can change it).Plug this shorter leg to the ground (blue line here) of the circuit. You can notice that the LED has a leg shorter than the other. Plug a black wire between the blue line of the breadboard and a ground (GND) pin on the Arduino board.First, make sure to power off your Arduino – remove any USB cable.Step by step instructions to build the circuit ( more info about Arduino pins here): A bunch of male to male wires (including if possible black, red, and other colors).If you don’t have, you can go until 20k-50k Ohm. If you don’t have this specific value, any resistor from 330 to 1k Ohm will do.
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