Blink Without Delay | Arduino Documentation | Arduino ... Try on Your Own Challenge. After the digitalWrite, we will set a delay function in order to wait for some time, defined in milliseconds. Conclusion The blink without delay function in Arduino is the beginner level project which is used to demonstrate how the project can be executed without using the delay function. blink without delay. */ // the setup function runs once when you press reset or power the board void setup() { // initialize digital pin 13 as an output. The voltage is adjusted by the potentiometer. When you use the delay() command, nothing else happens for that amount of time. The Arduino Web Editor allows you to write code and upload sketches to any official Arduino board from your web browser (Chrome, Firefox, Safari and Edge) after installing an agent. Some of the frequent contributors thought this might be a good example - for when the tutorial " Blink without Delay " example is not enough. /* Blink Turns an LED on for one second, then off for one second, repeatedly. Arduino Blink Example in Assembly using Timer/Counter1. The program might miss the button press if it happens during the delay(). here is the code: #define LED 2. The same can be done using Arduino IDE. Blink Without Delay using Arduino - Use Arduino for Projects Coding Timers and Delays in Arduino : 8 Steps - Instructables The first thing you do is to initialize LED_BUILTIN pin as an output pin with the line pinMode (LED_BUILTIN, OUTPUT); In this mode _delay_ms() will work with a resolution of 1/10 ms, providing delays up to 6.5535 seconds (independent from CPU frequency) So you should implement your own function to get longer delays (calling _delay_ms in a loop for example), or use the Arduino delay function if you're using that environment. . Now you are going to make that light blink by introducing the delay() function into the above code. The code is. Blink an LED - ESP32 online Arduino Simulator - 2022 ... Example - 01.On Off. Once you've understood the basic examples, check out the BlinkWithoutDelayexample to learn how to create a delay while doing other things. input - Arduino Rfid reading delay while blinking LED ... This example uses the built-in LED that most Arduino boards have. The code below uses the millis () function, a command that returns the number of milliseconds since the Arduino board started running its current program, to blink an LED. Most Arduinos have an on-board LED you can control. Blink - Arduino In the loop () function we will give some delay and toggle the Pin status. Arduino Blink two LEDs without Delay(amount of repetitions) 2 (Beginner) Blinking led call function. Blink Interactive Tutorial — Arduino-ESP32 2.0.2 documentation begin (9600) This indicates that the Arduino is allowed to send back symbols at a rate of 9600 symbols per The delay() function accepts an integer value, equal to a length of time in milliseconds. Arduino NeoPixel Blink | Adafruit KB2040 | Adafruit ... Arduino Lesson 6 - Using Time to Blink, not Delay Define the PIN as output. Open the arduino IDE and write the following program to blink an LED. Yeah, logically this reverts pin#13 to zero, switching OFF the LED. 3dprinter October 20, 2011, 4:11pm #1. 5th Sept 2019 update: Removing delay() calls is the first step to achieving simple multi-tasking on any Arduino board. Blink | Arduino Documentation | Arduino Documentation Blink LED with Arduino. But to blink two LEDs, unless you want to blink them both at once or one after the other, you lack control. Quick Steps. Arduino multitasking using finite state machines. The same can be done using Arduino IDE. Make It Blink. The next line shows the delay() function with a single parameter. A possible solution to the problems generated by using the delay() function is to use the millis() function. Arduino Code /* Blink Turns on an LED on for one second, then off for one second, repeatedly. Then change the second delay as well: Now Save it as a new Sketch called MyBlink (or really anything but a descriptive name is wise). Arduino Stack Exchange is a question and answer site for developers of open-source hardware and software that is compatible with Arduino. For instance, in Project (LED BLINKING ARDUINO UNO) we used the delay(1000) feature to hold the LED Turns on. Here, we will discuss a project to blink five LEDs using array. 9. time_now = millis(); 10. . That method blocks ESP32 from doing other tasks. /* Blink Turns on an LED on for one second, then off for one second, repeatedly. What is arduino arduino is an open source, electronic prototyping platform based on flexible and easy to use hardware and software. . This means that other code. How to use a Potentiometer with Arduino. Open the new sketch File by clicking New. If an arduino project contains a code that blinks an LED, say we have: Mainly you had seen light strings in which this type of function is used. One of the most straight forward way of making an LED blink is: turn it on, wait a bit, turn it off, wait again, and repeat endlessly: On Arduino IDE, Go to File Examples 01.Basics Blink example. Blink Without Delay This is the BlinkWithoutDelay example sketch from the IDE: Download File Copy Code /* Blink without Delay Turns on and off a light emitting diode (LED) connected to a digital pin, without using the delay () function. Delay value = 49911 in decimal, converting it to hex, we get a 16-bit value of 0xC2F7, this 16-bit value should be loaded as two 8-bit values as 0xC2 in TCNT1H . Open the example Sketch blink without delay and modify it to use the circuit above in a traffic light sequence. I have had experience with Arduino for 3 years now and have finally come to the conclusion to get rid of the delay function entirely. LED. The code used the delay (int millisecondsToWait) function to create the blinking effect. Tutorial on how to use the Timer /Counter1 module in ATmega328P using AVR Assembly to demonstrate a simple LED blink example. It is recommended to practice blink LED using millis again and again to make the logic clear and make yourself comfortable with millis() before starting to program Arduino UNO for multitasking.In this tutorial the interrupt is also used with millis() simultaneously for . Code Blink An LED Schematics Blink An LED Download Blink An LED Download Arduino delay() Function. Enjoy your blinking let stripes. #define blueLed 3 unsigned long previousMillis = 0; // stores last time Led blinked long interval = 100; // interval at which to blink (milliseconds) void setup () { // set the digital pin as output . Blink. This will create a blink pattern on the LED!. Blink an led stripe with no delay. Earlier in the code we saw the line: 1 Serial. For example you might want to blink an LED while reading a button press. Arduino with blinking LED program installed. I'm trying to write a blink without delay code that will wait 20 seconds, then blink 5 times, then wait another 20 seconds - rinse and repeat. Arduino delay() Function. Schematic After you build the circuit plug your board into your computer, start the Arduino Software (IDE), and enter the code below. In the previous tutorial, we learned to blink LED by using the delay method. So let us directly jump into our Python program. So far we have put the code on the Arduino and show via an LED that the code works. Open Arduino IDE, select the right board and port. Finally, your led blinking program will be opened step, six click on verify, symbol for compiling At the end of this tutorial we will Generate a Sequence of Blinking LEDs using PIC microcontroller PIC16F877A and will learn how to use multiple inputs and outputs . Quick Steps. This results in delay() causing a 1000ms (one thousand millisecond) delay. Active 5 months ago. // give it a name: int led = 13; // the setup routine runs once when you press reset: void setup() { // initialize the digital pin as an output. This example code is in the public domain. Example - 05.Multiple Blink Without Delay. It is important for the beginners to read blinking LED with 555 IC. You may see the screenshot below. And after uploading the python code, a new output window will automatically appear. The Arduino Web Editor allows you to write code and upload sketches to any official Arduino board from your web browser (Chrome, Firefox, Safari and Edge) after installing an agent. Once again, the LED will light up, delay a second and then go dark for one second. Without using the delay () function we are not restricted to a single task and can run any other instructions of the code. We Can Make Arduino To Blink Two LEDs Alternatively in Various Ways of Coding. Can you think about what the value of this parameter represents? It accepts a single integer (or number) argument. Run the code. Blink two LEDs with a 0.5 sec delay. Below is the code to blink two LEDs a complete 10 times. In this tutorial we are going to see how we can blink a led with out using delay func. One take arduino uno board, step 2; connect it to your laptop through arduino, usb cable from your arduino uno board. Minor alteration of need does need some changes of logical way of thought. Step 4: write some code . Code for the LED Blinking using Arduino without Delay //project name- Blink LED without Delay. Connect Arduino to PC via USB cable. At first glance you may doubt the usefulness of this function. One take arduino uno board, step 2; connect it to your laptop through arduino, usb cable from your arduino uno board. Arduino In this case, you can't use delay (), because Arduino pauses your program during the delay (). In short, this means you are not stopping the logic from scanning. It keeps track of the last time the Arduino turned the LED on or off. You may also load it from the menu File/Examples/01.Basics/Blink . The blink without delay () function in Arduino is the beginner level project which is used to demonstrate how the project can be executed without using the delay () function. Now in between the above ON and OFF of the LEDs we would require a certain time delay gap, so that the blinking makes sense and becomes recognizable. Circuit. Blink Without Delay using Arduino - Use Arduino for Projects Using millis like delay If you want your code to just pause for 1000 ms at the end of each loop iteration, the code above is a bit silly. We will just define the PIN which will be toggled. This language is called Wiring and is a simplified dialect version of C and C++. In other words, Arduino cannot fully do the second task. Beginner Arduino programs tend to focus on a single goal, such as blinking an LED or spinning a servo, where the timing is controlled using delay; the famous blink sketch is a prime example: 1 void setup() { 2 pinMode (13, OUTPUT); 3 } 4 5 . The LED is turned on for a few seconds, then back to dim position in a few seconds, turned on again, dimmed again, and . /* * Created by ArduinoGetStarted.com * * This example code is in the public domain * * Tutorial page: https . Finally, your led blinking program will be opened step, six click on verify, symbol for compiling In our case this is 1000 milliseconds, which is the equivalent of 1 second. 20th Dec 2021 update: added PinFlasher class and example (included in SafeString library V4.1.13+) 6th Jan 2020 update: The millisDelay class is now part of the SafeString library V3+. This allows to connect the arduino with python. I have written the classic LED blinking example provided in the book Getting Started with Arduino. It is intended to be used by the artists, designers, hobbyists and anyone interested in creating interactive objects or developing environments. After you build the circuit plug your Arduino or Genuino board into your computer, start the Arduino Software (IDE) and enter the code below. . It helps buffer the differing time scales of humans and micro-controllers — seconds for humans and microseconds for micro- Problem solving and program structure (Programming) Wire the following circuit for the traffic light program Take a picture of the circuit and add it to your Arduino Assignment sheet. In this case, you can't use delay(), or you'd stop everything else the program while the LED blinked. Blinking LED program is simple. Example - 02.Toggle. On the UNO, MEGA and ZERO it is attached to digital pin 13, on . Changing the delay. Example - 06.Multiple Blink With Offset. Here is a short example of the standard sketch that use millis () instead of Delay (). See How To. Blinking of two LED's alternatively with a suitable delay. Hot Network Questions Do heavy human losses put pressure on an autocratic leader like Putin? Coding in the Arduino language will control your circuit. Change the value of the delay . A well known Arduino function is delay() which pauses the program for an amount of milliseconds specified as parameter.. millis(), on the other hand, is a function that returns the amount of milliseconds that have passed since program start. Step 1: From BlinkWithoutDelay to a Single Function. Arduino program uses the delay() function to freeze the condition of a sketch running in an arduino at any moment it is evoked. Programming Arduino UNO for multitasking will only require the logic behind how millis() work which is explained above. Like normal door bells, after pushing the push button, the sound automatically stops after a time and three LEDs rhythmically glow. This is very handy function for introducing a short time delays into programs. The components required for the project are listed below: 5 x red LED This program works fine to blink one LED. Blinking various LEDs using Arrays. And repeat - now you have a blinking LED - pretty cool for just a couple lines of code! On Arduino IDE, Go to File Examples 01.Basics Blink example. This means that other code can run at the same time without being interrupted by the LED code. int ledPin = 13 ; // the number of the LED pin const long interval = 1000 ; // interval at which to blink the LED (in ms) void setup ( ) { // set the digital pin as output: pinMode ( ledPin , OUTPUT ) ; } void loop ( ) { // here is where you'd put code that needs to be running all the time. Multiple Blink Without Delay Arduino Tutoria /* Blink without Delay Turns on and off a light emitting diode(LED) connected to a digital pin, without using the delay() function. On Arduino IDE, Go to File Examples ezOutput 05.MultipleBlinkWithoutDelay example. */ // Pin 13 has an LED connected on most Arduino boards. Most Arduino boards already have an LED attached to pin 13 on the board itself. 220 ohm resistor. Instead of the traditional blinking sketch, this one is more fun, blinking the built In LED at random intervals intead of fixed intervals. * LED attached from pin 13 to ground. Running an event only once using the "Blink without delay" method in C++. Breadboard, 170 Pin Apps and online services Arduino IDE Arduino Web Editor About this project it blinks and led without using the delay function and just one if statement. Five. This means that other code can run at the same time without being interrupted by the LED code. Arduino - Output Library. Follow answered Mar 21, 2014 at 8:31. spring . This sketch demonstrates how to blink the LED without using delay(). edit: since you seem to be struggling, here is one (of countless) way (s) to do #1 above. When you do that you'll get the warning that it's read-only. We could blink two LEDs alternatively using 555 IC. Connect Arduino to PC via USB cable. As a result you should now see your Arduino LED blink with 1000ms intervals. Arduino - LED - Blink Without Delay Let's imagine that Arduino has to do two tasks: blinking LED and checking the button state, which can be pressed anytime. Arduino Vending Machine to monitor coin slot input while waiting for user input. //blinky_ledx2.ino //blink two led strips independently //blinky rate #define LED_DLY 100 //duration for . Viewed 100 times 1 I have an Arduino sketch that controls two different motors, a stepper motor, and a DC motor, using the Adafruit motor shield library. ESP32 - blinky with delay function. All the five LEDs will light one after the other. Arduino Lesson 6 - Using Time to Blink, not Delay written by Howard May 9, 2020 Okay, so in the last lesson, we learned to use a pushbutton to have our LEDs start blinking. . The major problem with the delay() function is that it blocks the execution of the code sequence. In the Blink example sketch, delay() is passed a value of 1000. It takes only 3 steps. Conversely, the delay () function pauses the execution of logic. From the first use of the Arduino, the delay() function is used to manage instructions as a function of time. This tutorial instructs you another method to blink LED without blocking other tasks. This makes it easy to have independent control of the "on" and "off" times. system June 26, 2012, 1:43am #1. Blink Without Delay Sometimes you need to do two things at once. We have already discussed how to blink a single LED, two LEDs, and LEDs using a loop, in previous topics. */ // Pin 13 has an LED connected on most Arduino boards. This is a basic program just to test if everything is working with your newly installed Arduino board. 1000 milliseconds is equal to one second. The detail instruction, code, wiring diagram, video tutorial, line-by-line code explanation are provided to help you quickly get started with ESP32. #tinkercad, #arduino, #code Hello friends , welcome back to my channel. Most Arduinos have an on-board LED you can control. I need to keep with millis () instead of any delay . This takes something on the board and makes it, well, blink! Install ezOutput library. For alternative approaches to controlling timing see the Blink Without Delay sketch, which loops, polling the millis () function until enough time has elapsed. For instance, in Project (LED BLINKING ARDUINO UNO) we used the delay(1000) feature to hold the LED Turns on. 1000ms is the same as 1s, or one second. The advantage is that if you want to add two LEDs in the above sketch, then add in this way : Vim. // give it a name: int led = 13; // the setup routine runs once when you press reset: void setup() { // initialize the digital pin as an output. Arduino can sense the environment by Go to file then examples, then basics and click on blink step. A 220-ohm resistor should work for this project. Implementing Arduino delay in your code The Arduino delay () function Here's a code to make an LED blink (here we choose the built-in LED, no need to add any external LED) every 0.5 seconds - this is one of the most common examples you'll see if you begin with Arduino. 1. Do yourself a favor and take ten minutes to read through the tutorial and the code in order to understand what it does. This, you can execute other instructions while the light is waiting to turn on or off. About this project. Its value is the amount milliseconds the program has to wait. Arduino community. In this arduino tutorial, we shall discuss how to blink an LED without using the delay() function. Code The code below uses the millis() To run this code, you'll need a development board and the Arduino toolchain installed on your computer. /* Blink Turns an LED on for one second, then off for one second, repeatedly. . This allows to connect the arduino with python. This example code gives you complete independant control of how […] Arduino IDE serial monitor. Blink two led stripes, using the code developed in step 1. Step 3, open arduino, ide step 4. This example shows the simplest thing you can do with an Arduino to see physical output: it blinks the on-board LED. Arduino Board; optional. We control the delay time of LED blinking, we replace the value of the delay time from the potentiometer reading variable. The blink without delay () function in Arduino is the beginner level project which is used to demonstrate how the project can be executed without using the delay () function. The standard blink without delay example doesn't give you this flexibility. pin, without using the delay () function. Open Arduino IDE, select the right board and port. Or better: use timers. The Arduino Blink Without Delay example allows you to blink a light without using the delay () function in the Arduino IDE. Blink Two LEDs, independent, no delay. Hardware Required. Example - 03.Single Blink Without Delay. The code delay () commands Arduino to remain stationery until a second, in other words this command mutes Arduino Blinking LED in Pure C. The Arduino IDE contains a simplified language for developing for the Arduino platform. Download SafeString from the Arduino Library manager or from its zip file. . Serial.println("Hello"); If you want your code to just pause for 1000 ms at the end of each loop iteration, the code above is a bit silly. /* Blink Turns on an LED on for one second, then off for one second, repeatedly. /* Traffic without Delay. Share. . Hardware Required. It only takes a minute to sign up. /* Multiple independent delay - Two blinking LEDs Working code example that blinks two LEDs, each with its own independent period. Arduino read Analog value by analogRead Function. This LED is connected to a digital pin and its number may vary from board type . Common input and output operations are simplified, making the environment ideal for prototyping for designers and makers. More knowledgeable programmers usually avoid the use of delay () for timing of events longer than 10's of milliseconds unless the Arduino sketch is very simple. Once the Arduino completes the loop, it starts at the top of the loop again and repeats like a broken record. Learn arduino - blocking blinky with delay() Example. The first and most basic program you can upload to your Arduino is the classic Blink sketch. Go back to your Arduino IDE window and highlight the 1000 in the first delay statement: Then change that from a 1000 to a 500. Without using the delay () function we are not restricted to a single task and can run any other instructions of the code. 3. EE 285 Arduino - timing - 1 The short program to blink the red LED used the delay() function. This example code is in the public domain. The fact is that it's extremely useful in many scenarios, often "replacing" delay . When all else fails, you can always come back to Blink! Common Example of Arduino is To One LED. To blink the LED you don't need much code. Blink without delay for 2 different time intervals. I am looking to use the basic blink without delay program but instead of having the the light blink on and off for only one period of time, I would like to keep the light on for one period and off for another. Now we can set the GPIO to LOW to turn the LED off and delay for more few milliseconds to get the LED blinking. Upload this code to the Arduino Uno . 1. pinMode(LED_BUILTIN, OUTPUT); In loop () function to blink LED with a time of 1 second, we set LED_BUILTIN PIN HIGH then delay for 1 second (or 1000 milliseconds) then set LED_BUILTIN PIN LOW then delay for 1 second (or 1000 milliseconds), This is loop () function so it will run continuously. On the UNO, MEGA and ZERO it is attached to digital pin 13, on . Example - 04.Single Blink Change Frequency. By Jon Black on November 22, 2015. arduino arduino-fsm. You can just use delay . Arduino Blink two LEDs without Delay(amount of repetitions) 0. If we use the delay () function (described in a previous tutorial ), Arduino may miss some of the pressing events. 11. In this case, you can't use delay (), because Arduino pauses your program during the delay (). can run at the same time without being interrupted by the LED code. Ask Question Asked 5 months ago. If you want to blink the two LEDs at different rates such as once a second for LED 1 and twice a second for LED 2 then the delay () function is not what you are looking for. When using delay() to flash a LED there is a time for the LED to be on and then off. On and off. delay() commands tell the board to do nothing for 1000 milliseconds, or one second. Go to file then examples, then basics and click on blink step. If you run this example with no hardware attached, you should see that LED blink. Step 3, open arduino, ide step 4. After writing the program you may save it with a file name of your choice (find File->Save on menu bar of IDE) Example - 07.Blink In Period. Arduino community. Open Arduino IDE, select the right board and port. The Arduino can also talk back to the computer via the serial monitor. So let us directly jump into our Python program. The Arduino delay() function causes a delay for a certain number of milliseconds, as described in the Arduino delay() language reference. You have completed the Arduino equivalent of "Hello World". Connect Arduino to PC via USB cable. There is an Arduino file called "Blink without Delay" It is included with the Arduino examples and I have linked to it. Five. It's a great way to make sure everything is working and you're uploading your sketch to the right board and right configuration. And after uploading the python code, a new output window will automatically appear. #define LED_PIN 13 void setup() { pinMode(LED_PIN, OUTPUT); } void loop() { 13 has an LED connected on most Arduino boards need to keep with millis )... This function favor and take ten minutes to read blinking LED - pretty cool for just a lines. > ESP32 blink without delay example doesn & # x27 ; s read-only this means that other code run! Esp32 tutorial < /a > Arduino: blink two LEDs Alternatively in Various Ways Coding. The UNO, MEGA and ZERO it is intended to be used the. Code: # define LED 2 Machine to monitor coin slot input while waiting user! So far we have already discussed how to use the circuit above a. Completed the Arduino equivalent of 1 second delay func may miss some of the standard blink without -... Time without being interrupted by the artists, designers, hobbyists and anyone interested in creating interactive objects or environments! 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Led strips independently //blinky rate # define LED 2 a simplified dialect version of C and C++ on or.! A time and three LEDs rhythmically glow pin status menu File/Examples/01.Basics/Blink light up, delay a and... Jon Black on November 22, 2015. Arduino arduino-fsm lack control now we set! Thousand millisecond ) delay pin # 13 to ZERO, switching off the LED code its zip.. Thousand millisecond ) delay is very handy function for introducing a short time delays into programs of & quot Hello! Follow answered Mar blink with delay arduino, 2014 at 8:31. spring with out using delay func sketch blink without delay -...! Uses the built-in LED that most Arduino boards have example provided in blink! # define LED_DLY 100 //duration for pushing the blink with delay arduino button, the delay for... Miss some of the delay time blink with delay arduino LED blinking: it blinks the on-board you!, IDE step 4 and click on blink step & # x27 ; ll need development! Arduino arduino-fsm ESP32 - LED - pretty cool for just a couple of. Blink pattern on the LED need to keep with millis ( ) function into the sketch... Can you think about what the value of the delay ( int millisecondsToWait ) function the... Sketch that use millis ( ) causing a 1000ms ( one thousand millisecond ) delay an! Example sketch, delay a second and then go dark for one,... And makes it, well, blink a result you should now see your Arduino blink! Led connected on most Arduino boards have at first glance you may also load it the! Led you can do with an Arduino to see physical output: it blinks the on-board you... Arduino code / * * Created by ArduinoGetStarted.com * * this example uses the built-in LED that the code saw... Code used the delay ( ) function using 555 IC while the is... Load it from blink with delay arduino menu File/Examples/01.Basics/Blink blink five LEDs will light up, delay ( ) function to create blinking. Last time the blink with delay arduino builtin LED < /a > 3 you should see that blink! Is that if you run this example code is in the book Getting Started with Arduino ) a! Off and delay for more few milliseconds to get the warning that it blocks the of. Questions do heavy human losses put pressure on an LED connected on most Arduino boards have ) calls is code., after pushing the push button, the delay ( ) can make Arduino to the... Just to test if everything is Working with your newly installed Arduino board a development board and port ''! That you & # x27 ; t give you this flexibility 1000 milliseconds which. Any delay like Putin dialect version of C and C++ Arduino equivalent &... Delay func instructions of the delay ( ) function pauses the execution logic... Program blink with delay arduino to test if everything is Working with your newly installed Arduino board code works conversely, delay. Arduino, IDE step 4 of logic ESP32 blink without delay - two blinking LEDs code. Then go dark for one second, then basics and click on blink step two. Task and can run any other instructions of the delay ( ) calls is the equivalent of & quot.... Test if everything is Working with your newly installed Arduino board loop ). Three LEDs rhythmically glow Arduino project Hub < /a > Arduino community //thecustomizewindows.com/2018/07/arduino-blink-two-leds-alternatively/... On any Arduino board > 3 Multiple independent delay - bereanwife.net < /a > 3 so let us directly into! The blink with delay arduino via the serial monitor an autocratic leader like Putin Multiple LED < /a > it takes only steps! The following program to blink five LEDs will light one after the other, you & # x27 s! User input using blink with delay arduino IC type of function is used to manage as. Hot Network Questions do heavy human losses put pressure on an LED on or off Changing the (... In which this type of function is used to manage instructions as function... T give you this flexibility Working code example that blinks two LEDs in the above code is Working your! Lesson 2 that LED blink output: it blinks the on-board LED you can other... Don & # x27 ; t give you this flexibility download SafeString from first! Function pauses the execution of logic the public domain * * this example code is the... Is the code sequence equivalent of & quot ; Hello World & quot ; using array user! Working code example that blinks two LEDs in the loop ( ) causing a 1000ms ( one thousand ). Waiting for user input, after pushing the push button, the delay ( int ). Will give some delay and toggle the pin status strings in which this type of is.
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