It helps us time events without pausing the code. if (--us == 0) return; // the following loop takes a quarter of a microsecond (4 cycles) // per iteration, so execute it four times for each microsecond of. If 5000 is passed as the argument then it generates a delay of 50ms. Try putting a delay into the loop() in your Arduino code to slow it down, e. There are a thousand microseconds in a millisecond and a million microseconds in a second. \$\begingroup\$ Yes, because delay_us calculates how many CPU cycles it needs for a certain delay (based on F_CPU), in order to delay for certain amount of cycles with the delay_cycles. We have used ets_delay_us API to achieve 10 usec and 40 usec delay as per our requirement and that delay is used in some instructions to update firmware into another module which is attached with UART. asm volatile ( "nop":: ) Now, you want to delay longer than that but potentially shorter than 1us. Using delay () or other things that take time, you allow for more data to arrive before you try to read it. You'll need to either: 1) debug the software (you should do this anyway); 2) use the built-in watchdog timer to reset the arduino if your software doesn't reset the watchdog; or 3) use an external hardware timer to reset the Arduino at intervals. Fundamentally, the Arduino core version of delayMicroseconds does the same thing as avr-gcc's _delay_us, which is a cycle-counting busy loop. An exact 100ns delay is not going to. This could change in future Arduino releases. delay (x) will delay for x number of milliseconds. One thing I discovered is if I'm using ruduino::delay::delay(n);, while n is some huge number like a 1000000, then it's blinking slower (3-4 times per second). Arduino e la funzione delay() By admin in Tips of the day Tag arduino, corso, delay, led, timer, uart. h. Viewed 973 times. h file On Arduino IDE: Either click on the button just below the serial monitor icon and choose "New Tab", or use Ctrl+Shift+N. cpp: In function 'void. begin (9600); } void loop () { Serial. Syntax. There are a thousand microseconds in a millisecond, and a million microseconds in a second. However, the problem is, the delay () function is not. Currently, the largest value that will produce an accurate delay is 16383. The maximal possible delay is 768 us / F_CPU in MHz. Part 1 helps us understand what the millis() function does, part 2 discusses tight loops and blocking code, and part 3 discusses when the millis() function outshines the delay() function. delay () is a blocking function. I. Time taken for 0 to 255 count in TCNT0 register = 62us x 255 = 15. None Example Just like delay () has a microsecond-version called delayMicroseconds (), millis () has micros (). Part 1 helps us understand what the millis () function does, and part 2 discusses tight loops and blocking code. 0. With the 1000ms delay that we have imposed with the delay () function, the Arduino is actually forced to do nothing (other than counting milliseconds) twice, in a single loop. 1 or // 2 microseconds) gives delays longer than desired. similarly for phase 2 and phase 3. Now let us compare delay for 1, 10, 100 and 1000 milliseconds using the vTaskDelay() function. There are a thousand microseconds in a millisecond, and a million microseconds in a second. setTextSize(n): set the font size, supports sizes from 1 to 8. /* Delay for the given number of microseconds. 4” LCD Screen, IMU and more practical add-ons housed in a compact enclosure with built-in magnets & mounting holes. Here's my code: uint16_t delayTime = 1000; uint64_t time; void setup(){ } void loop() { while (millis(). See the result on Serial Monitor. Hence, we will print the timer values after every 1. Description. For delays longer than a few thousand microseconds, you should use the delay() function instead. I am using LINX toolkit to program Arduino. Author: Michael Contreras. I chose the ESP32 because of its 240MHz clock, but it still seems to be having trouble. As of Arduino 0018, delayMicroseconds () no longer disables interrupts. irish_: the value inside the delay function can be negative. 1 on windows 10 and I'm getting something very strange. 4. Description Pauses the program for the amount of time (in microseconds) specified by the parameter. This function works very accurately in the range 3 microseconds and up. Code link: this video i will show you how to generate on delay timer in. g. For example, for LED1, you can use delay(1000), and for LED2, delay(2000). loop() , it checks to see if the desired blink time has passed. Dalam periode ini, Arduino akan menunggu selama 3 detik sebelum. Well I just said 1 second as an example, but really I want a delay of 1 clock cycle. So is timer 2 responsible for the delay() and delaymicroseconds() on mega? I did not find any resource mentioning. The ATmega328 built on the Arduino Uno has a total of 3 timers available, which are: Timer0 — An 8 bit timer used by Arduino functions delay(), millis() and micros(). 1 sec for human factors - input response timing delay(100); //wait 100 msec before restarting loop. Conclusion. How to use delay() Function with Arduino. The time delay can be set on the motion sensor and Arduino code: On motion sensor: min is 3 seconds and max id 5 minutes. Pauses the program for the amount of time (in microseconds) specified as parameter. It seems to me that the delay() function never works! I tried using the millis() as well and it doesn't work so well neither. You can delay that small by doing something like. I've done a lot of programming with RTOS on larger. 4 times faster but not 64? Hi, my objective is to use the if statement so that the first statement, if it's true, activates the second statement and the LED only turns on if the second statement is true. Serial communication that appears. Introduction: millis() and delay() Function in Arduino With Examples-Arduino, the popular open-source electronics platform, has revolutionized the world of DIY projects and automation. Reliable Wireless Connectivity: Equipped with Realtek RTL8720DN, dual-band 2. Pauses the program for the amount of time (in microseconds) specified as parameter. h only works for AVR boards. I am using the internal 1. Chapter 12. 1 or // 2 microseconds) gives delays longer than desired. Learn delay() example code, reference, definition. Description The delayMicroseconds() function pauses the program for the amount of time (in microseconds) specified as a parameter. Quick Steps. Specially if we are talking about Arduino or similar embedded development platform like STM32 based. From simple blinking LEDs to complex robotic systems, Arduino provides a versatile environment for enthusiasts and professionals to bring their ideas to life. Home ; Categories ; FAQ/Guidelines. int outPin = 8; // digital pin 8void setup() { pinMode(outPin, OUTPUT); // sets the digital pin as output}void loop() { digitalWrite(outPin, HIGH); // sets the pin on. Delay () blocks the complete processor. asm volatile ( "nop":: ) Now, you want to delay longer than that but potentially shorter than 1us. agdl mentioned this issue on Jan 9, 2015. In the code below, we have used a similar program like the previous example. delayMicroseconds(us) Parameters. Delay functions (busy idling) are one of the worst choices, better use a timer peripheral. I would like to toggle an output pin in the order of microseconds so use the function delayMicroseconds. Description. 3 tên mã Chia sẻ tình yêu với Arduino. This sketch demonstrates how to blink an LED without using. Currently, the largest value that will produce an accurate delay is 16383. . Create the pitches. Pauses the program for the amount of time (in microseconds) specified as parameter. ocsav May 1, 2017, 7:43pm 1. If you omit Step-4, you will not see that the LED is OFF though there is a code in Step-3 to turn OFF the LED. Assumes a 8 or 16 MHz clock. Certain things do go on while the delay () function is controlling the Atmega chip, however, because the delay function does not disable interrupts. Timer library for delaying function calls. After that search for ‘arduino hen house door”, it’s been done a hundred times. Tìm hiểu thêm. delayMicroseconds (0) delays far longer than expected. I programmed an Arduino Uno R3 to trigger a relay once every 24 hours from the moment it is powered on. h","contentType":"file"},{"name. If your application requires that you constantly. The rest of us use packet markers to define when the complete packet has arrived. This is especially true when you start using the Arduino delay function, which can causes issues very quickly. But if you're trying to bitbang a signal with 1 µs accuracy, you'll probably have to write a tight assembler loop. */ void delayMicroseconds(unsigned int us) { // call = 4 cycles + 2 to 4 cycles to init us(2 for constant delay, 4 for variable) // calling avrlib's delay_us() function with low values (e. 4. Greetings, I am having an I2C speed issue. 5th Sept 2019 update: Removing delay() calls is the first step to achieving simple multi-tasking on. 0. Currently, the largest value that will produce an accurate delay is 16383. Hello, Welcome to the Arduino Forum. I have a library which has a function that calls delay, and this gives a compiler error: Arduino: 1. You need to refactor your code as others have suggested. Using Arduino Programming Questions. Remember that there is a lot of code that. delay() . Arduino library to make use of the Millis funtion for non Blocking Delays. 4 times faster than normal. delay(time_in_ms); method works in other way than in arduino. If we do NOT set a timeout in the Arduino code, the timeout is equal to the time delay in the sensor's setting. Unlike your personal computer or a Raspberry Pi, the Arduino has no way to load and run multiple. The datasheet goes on to tell you what those mean: Bits 2:0 – CS02:0: Clock Select. When you have it wrapped with a function, you're passing it a variable, not a constant. A continuación, descubrirás por qué el uso de delay () no suele ser una buena idea cuando quieres que tus programas escalen, y cómo solucionarlo. I would like to write my own function to create a delay in a FreeRTOS task,. 3. Check out the implementation of delayMicroseconds() /* Delay for the given number of microseconds. The Arduino programming language Reference, organized into Functions, Variable and Constant, and. This produces ~104us delay: digitalWrite (resetPin, LOW); _delay_us (100); digitalWrite (resetPin, HIGH); This produces ~4412us delay: digitalWrite (resetPin, LOW); delayMicroseconds (100. 06-15-2021 06:29 AM. The code's syntax is correct according to the Arduino software but when I try the uploaded program on my Arduino Uno, the LED always stays off. Para delays mais longos que alguns milhares de microssegundos, você deve usar delay() em vez disso. h and comment out this #include or is there something else I can do?. Just like delay () has a microsecond-version called delayMicroseconds (), millis () has micros (). 7 hours = 1000 * 60 * 60 * 7 = 25,200,000. Bestimmte Dinge laufen jedoch weiter, während die delay () -Funktion den Atmega-Chip steuert, da die delay () -Funktion Interrupts nicht deaktiviert. Arduino library to easily use on/off delays and cycle timers with non-blocking functions. print("Attempting to. Servos have integrated gears and a shaft that can be precisely controlled. When i upload my Arduino kit and turn on Serial plotter, the potentiometer's graph is working but the delayed graph is not working. sleep is the time to delay in seconds (not milliseconds). Assumes a 8 or 16 MHz clock. Espressif Systems is a fabless semiconductor company providing cutting-edge low power WiFi SoCs and wireless solutions for wireless communications and Internet of Things. There is only one person on this forum that thinks using delay () is a good idea, with serial communications. 8. The delay () function allows you to pause the execution of your Arduino program for a specified period. But make sure to do the time unit conversion and pass to it the desired time in milliseconds. begin (9600); } void loop () { delay (1000); Serial. For that purpose, the method requires you to supply it with a whole number that specifies how many milliseconds the program should wait. It turns the LED on and then makes note of the time. HazardsMind May 20, 2013, 4:33pm 3. You can easily find or write a piece of code that delays for 12500 nanoseconds (+/-62. From the arduino reference page for delay the parameter for delay is an unsigned long. 134 delays up to 6. Allowed data types: unsigned int. Usage. drawPixel (x,y, color): plot a pixel in the x,y coordinates. And I change the prescaler to 1. performance on par with delay4us(); delayMicroseconds() produced a delay of 45 ticks. No entanto, certas coisas continuam a acontecer enquanto a função delay () está controlando o microcontrolador, porque a função delay não desativa. Open Serial Monitor. Managing time is a fundamental element of interactive computing. COM6. The first thing you will discover is that some of those sketches that ran perfectly by themselves, just don’t play well with others. Currently, the largest value that will produce an accurate delay is 16383. The Arduino's internal time is just a count of how many times this crystal has vibrated. Timing. 1 or // 2 microseconds) gives delays longer than desired. The fact is that it’s extremely useful in many. However, be aware that micros. 86ms, consumption is still 1. performance on par with delay4us(); delayMicroseconds() produced a delay of 45 ticks. During a delay () call, you can’t respond to inputs, you can't process any data and you can’t change any outputs. delayMicroseconds(us) Parameters. We cannot assure that delayMicroseconds will perform precisely for smaller delay-times. 12. I wrote some if statements to include _delay_us () for values of 1 and 2 microseconds. #include <utils/delay. Closed. 1 unsigned long ms_from_start =0; 2 unsigned long ms_previous_read_LED1 = 0; 3 unsigned long LED1_interval =1000; 4 unsigned long. 1 second = 1000 milliseconds. _delay_us is more thoroughly tested, and when used directly it gives single-cycle accurate delays. It's important to note that the exact workings of a traffic light can vary depending on the specific design and technology used in different regions and. That makes sense. Description. Serial communication that appears. This article shows you how to control 3 LEDs with different delay functions and without delays. 1. unsigned long ini= 0 ; void setup() { Serial. For that purpose, the method requires you to supply it with a whole number that specifies how many milliseconds the program should wait. precisión del retardo de arduino. I think that you can't use them on a ESP32 (moreover with the arduino pin numbering) without a proper rewriting. 1; 1. Timer1 — A 16 bit timer. set the output LOW PinFlasher f (4,true); // set pin 4 as the output. However, SPIMemory says it supports the Nano 33 BLE. The NoDelay library is used as a easy interface for using the built-in Mills function for keeping track of elapsed time and used for non blocking delays. From experimenting I've found the busy_wait_at_least_cycles function works well. 1 Answer. Certain things do go on while the delay () function is controlling the Atmega chip however, because the delay function does not disable interrupts. the value returned is"," * always a multiple of four). The Arduino programming language Reference, organized into Functions, Variable and Constant, and Structure keywords. The Arduino programming language Reference, organized. in your project (where arduino-hal is included. Send. Both are not running when tried to run the basic example of yield function available at arduino forum. For that purpose, the method requires you to supply it with a whole number that specifies how many milliseconds the program should wait. 7 days. The. Standard servos allow the shaft to be positioned at various angles, usually between 0 and 180 degrees. Syntax. En el siguiente ejemplo, se usará a la función de Arduino millis para generar un retardo de 1 segundos = 1000ms para enviar un mensaje por el puerto serial. Syntax delay (ms) Parameters ms: the number of milliseconds to pause. The Timer 0 delay looks like it was never completed. I'm messing around with the following code: #define cyclespermicro 240 #define microcycles (n) (n*cyclespermicro) uint32_t startCounter, counter, cpu_cycles; int. Instruction Cycles DELAY : LDI COUNT, 0XFF 0 Again : NOP 1 NOP 1 NOP 1 DEC COUNT 1 BRNE AGAIN 2/1 RET 4 Solution : Time Delay = [1 + ( ( 1+ 1+ 1+ 1 + 2 ) x 255) + 4 ] x 0. Unless it is a linear and very simple program , do not use this. flush() now waits for transmission of outgoing data rather than discarding received incoming data. It can't be interrupted. arduino. Simple non-blocking timer library for calling functions in / at / every specified units of time. As we want the delay of 1 microsecond, the timer frequency must be (1/ (1 us)), i. */ void delayMicroseconds (unsigned int us) {// call = 4 cycles + 2 to 4 cycles to init us(2 for constant delay, 4 for variable) // calling avrlib's delay_us() function with low values (e. For delays longer than a few thousand microseconds, you should use delay () instead. doesn't work with delays <1 ms. The code I tried is as follows. but also not absolutely terrible for my needs. g. millis () is incremented (for 16 MHz AVR chips and some others) every 1. Learning how to use millis instead of delay is a key principle for learning the Arduino platform. This is my program code that contains the Eeprom. If it's true, how come it is 6. For this I got a code from Arduino forum which is given below. 81ms = 63. h>. For my project I need to measure time in nanosecond fineness. . The two push button presses have to happen within a two seconds delay. When you use millis () to time events instead of delay (), your code keeps on looping and allows it. Sorted by: 2. En este tutorial aprenderás a utilizar correctamente la función delay () para añadir algo de retardo entre 2 acciones en tus programas de Arduino. Hi, I'm using Arduino IDE 1. h> // set pin 53 as the slave select for the digital pot: const int slaveSelectPin = 53; //WAS. Đây là trang thông tin phi lợi nhuận ra đời hướng tới cộng đồng trẻ, những chủ nhân tương lai của đất nước. However, in field tests, the arduino. 1v reference and I wonder if the delay between setting the reference source and doing a conversion is necessary: I suspect so. 1. Arduino cuenta con un conjunto básico de funciones para el manejo de tiempo, y estas son: millis, micros, delay y delayMicroseconds. So, that's your resolution. 3) After 5. Say you have a button you wanna check for during a delay. At 16 MHz that's 16 counts (no prescaler) per µs, with an offset to correct for the delay between. The code I tried is as follows. The Arduino reads the potmeter's value once, outputs that value to serial once, and goes back to chilling out, maxing relaxing all cool. Hi, I am trying to measure a time of 1us. There are a thousand microseconds in a millisecond, and a million microseconds in a second. If the user requests a delay greater than the maximal possible one, _delay_us () will automatically call _delay_ms () instead. Serial communication that appears. All without using the delay() function. The delay () function allows you to pause the execution of your Arduino program for a specified period. The challenge is that there appears to be some latency in the updates on the OLED, sometimes. 5 seconds, stop t2, start t1, go back to 1) Fig. Interrupts are a common way to get things done while something else is going on. Erfahrene Programmierer vermeiden normalerweise die Verwendung von delay () für das Timing von Ereignissen, die länger als 10 Millisekunden sind, es sei denn, der Arduino-Sketch ist sehr einfach. oled. Common HAL (hardware abstraction layer) for Arduino boards. You can define a routine using a special function called as “Interrupt Service Routine” (usually known as ISR). 1. 75 us low time with my scope. It is used to programmatically control on/off the devices, which use the high voltage and/or high current. 1. It switches the LED on/off. {"payload":{"allShortcutsEnabled":false,"fileTree":{"hardware/Arduino_STM32/STM32F4/cores/maple/libmaple":{"items":[{"name":"usbF4","path":"hardware/Arduino_STM32. Here’s a step-by-step guide to setting up a Timer Interrupt: Install the TimerOne library in your Arduino IDE. . But in the code, Timer 0 is disabled and so delay(), millis() etc won't work. The Arduino runs at 16 MHz, so 1 µs is only. The delay has to be configurable to sub microsecond resolution. No entanto, certas coisas continuam a acontecer enquanto a função delay () está controlando o microcontrolador, porque a função delay não desativa. The user will not be informed about this case. I've wrote a. Arduino programming language provides some time functions to control the Arduino board of your industrial PLC controller and perform computations. You can use a buzzer whenever you want to make some noise. 0, if you wanted 50 milliseconds, it would be 0. Arduino delayMicroseconds function - The delayMicroseconds() function accepts a single integer (or number) argument. READ THIS! - these next two paragraph are apparently incorrect. Both threads have the same priority. These functions rely on interrupts themself, so they won’t work while the processor handles your custom interrupt callback function. int Green = 18; int Relay = 12; int Input = 4; int state = LOW; int val = 0. void delay( retardoMilisegundos ); Donde: retardoMilisegundos. Include the TimerOne library at the top of your sketch. Pauses the program for the amount of time (in microseconds) specified as parameter. You can define the routine and specify conditions at the rising edge, falling edge or. //delay_us(us); // for the 16 MHz clock on most Arduino boards // for a one-microsecond delay, simply return. Your while loop never ends until button is pressed so 10s delay has no sense. the macros are cycle-accurate, e. . It can apply to control ON/OFF any devices/machines. Hello, I'm wondering if i'm doing this right. You can delay that small by doing something like. 5; uint32_t start_Time; uint32_t MicroSampleTime;; class delayBox { public: delayBox (float delay. The components requires for this project involvve; Eight LEDs, Ten jumper wires, a breadboard, Eight 330ohm resistors, an Arduino micro controller and its connecting cable and finally a working computer. 1. wildbill May 21, 2014, 1:04pm 12. It is just that simple. When used in simple sketches, you might not notice a difference when using the delay () function. Once the sensor detects any motion, Arduino will send a message via the serial port to say that a motion is detected. –> Check out our guide to the Top 12 Best Arduino Online Courses. Components Required: - Arduino Uno board * 1 - USB cable * 1 - Buzzer (active) * 1 - Breadboard * 1The Arduino library delay function documentation states that it is only accurate within 3us, which won't work for this application. Each CPU has its own interrupt latency which is dictated by the way it handles. Ignoring the overhead, which may be significant: An arduino runs at 16MHZ. Pauses the program for the amount of time (in milliseconds) specified as. Below sketch is working fine. After the ISR returns, the remaining 150 us of the delay runs. This is done by creating a noDealy object and setting the amount of time for the delay you want. Tìm hiểu thêm. To record time in milliseconds, we. This broke the real-time behaviour on my Arduino Mega because it now uses vTaskDelay() under the hood, and on the Arduino Mega, there is no real SysTick (here, the watchdog timeout with a resolution of 15 ms is used), what. The Arduino millis () is a timer-based function that returns to you the time elapsed (in milliseconds) since the Arduino board was powered up. Currently, the largest value that will produce an accurate delay is 16383. I also added in delay () for values in milliseconds. h" and click "OK" button. When you multiply the 16-bit signed integers 60 and 1000, you don't get 60000, but rather -5536. Not great given the clock rate should be 64 MHz with a clock cycle period of 15. 125 µs I subtracted is the time needed by the actual port writes: both the sbi and cbi instructions take two cycles (0. 3 tên mã Chia sẻ tình yêu với Arduino. Syntax delay (ms) Parameters ms: the number of milliseconds to pause. Because the delay is blocking the other code from running. simple way: Delay (1000) is equal to 1 second, so 60 * 1000 = 1 minute. Arduino: delay() vs delayMicroseconds()Helpful? Please support me on Patreon: thanks & praise to God, and with tha. setInsecure(); while (status != WL_CONNECTED) { Serial. Beware also that some libraries can delay interrupts for excessive amounts of time. They allow us to perform various tasks, such as generating accurate delays, creating periodic events, measuring time intervals, and meeting the time requirements of the target application. The Arduino programming language Reference, organized into Functions, Variable and Constant, and. I have a code where my I2C communication is taking 6 milliseconds for 3 communications, pulse 5 milliseconds in delay commands for 11 millisecond in total (per channel). Timers in. Using the if statement with a time delay. I needed to #include "nrf_delay. From experimenting I've found the busy_wait_at_least_cycles function works well. Dengan menggunakan fungsi delay, Arduino dapat menunggu selama jangka waktu yang ditentukan sebelum melanjutkan ke baris kode berikutnya. Delay juga dapat menggunakan satuan wajktu us (micro seconds). 9ns. The delay () function allows you to pause the execution of your Arduino program for a specified period. It takes as an argument the value of the delay in milliseconds. To be honest, Arduino is not the best template for professional SW development, to say the least. delayMicroseconds(us) pauses for a given number of microseconds. . Hi, The thing with uS delays under software control is you need to clearly understanding you're tolerances. delay ()関数を使ってLEDを点滅させることは簡単だし、多くのスケッチではスイッチのチャタリングを防止するために少しの遅延を利用しているが、スケッチ でdelay ()を利用することには重大な欠点がある。. g. With the 1000ms delay that we have imposed with the delay () function, the Arduino is actually forced to do nothing (other than counting milliseconds) twice, in a single loop. 024 milliseconds, then incrementing by 2 (rather than 1) every 41 or 42 ticks, to pull it back into synch; thus some millis () values are skipped. Aprender a usarlas cor. Supports: periodic task execution (with dynamic execution period in milliseconds or microseconds – frequency of execution), number of iterations (limited or infinite number of iterations), execution of tasks in predefined sequence, dynamic change. Now if we need a delay of 1 sec using Timer then. The largest value it can return is over 4 billion (4,294,967,295 to be exact). Like this: // check to see if it's time to do something; that is, if the // difference. Last week, my esteemed colleague MTaylor explored a solution to scheduling periodic tasks on Arduino. g. SofwareSerial bit banging) by disabling interrupts during its core delay code. Delay is an arduino function wrapper that calls vtaskdelay. This could change in future Arduino releases. The library provides a simple on/off delay for digital signals or a cycle timer which creates a periodically output. The Arduino programming language Reference, organized into Functions, Variable and Constant, and Structure keywords. Start the delay: 1 ) set the timestamp to the millis : previousMillis = millis () ; 2 ) set the boolean flag : delayActive = true; Check the delay in the loop:Description. delay (1) = 494 Hz at flow computer. Con số này. 295 us/ F_CPU in MHz. Whereas Arduino runs at 16MHz. Delay is very important function in any embedded system application. Delay_ms function is normally abbreviated to. It can be easily modified for any Arduino or for other common Atmel chips like the ATtiny84 or the ATmega328. Everything seemed to be working well in my simulations, but whenever I built the circuit and looked at the timing on an oscilloscope all of my uS values seemed to be off. So, that's your resolution. delay() 関数を使用してコードに遅延を追加し、コード内の出力を確認しました。micros() 関数の前のコード行を実行するのに 1060 マイクロ秒かかりました。 命令の実行にかかる時間は、Arduino ボードの種類によって異なります。これは、ボードによって周波数が異なるためです。Using Arduino Programming Questions. See: Gammon Forum : Electronics : Microprocessors : How to process incoming serial data without blocking. Currently, the largest value that will produce an accurate delay is 16383; larger values can produce an extremely short delay.