Non blocking delay. Introduction The standard Arduino delay function blocks the Arduino, that is not always allowed. The standard delay has limitations too it is not possible to use multiple delays at the same time. BAd4IApG_f7stCbeaAYf1ag_sW32QkyC25XvBG-26nxtAWLmbMD0sx3Qx1F58CBLn=h900' alt='Virtual Serial Port Wifi Map' title='Virtual Serial Port Wifi Map' />So I decided to developed a Virtual. Delay library which has many advantages Advantages of the Virtual. IP Address Wifi Router Login. IP Login 192. 168. IP while networking through any standard router or standard ADSL. USB to serial drivers for most serial RS232 devices. Download drivers for most types of USB to serial adapters and converters. Download CH340 driver for windows 7, windows 8, windows 10 and also for MAC users. Check out how to install driver for ch340g usb to serial converter IC. Introduction. The standard Arduino delay function blocks the Arduino, that is not always allowed. The standard delay has limitations too it is not possible to use. Virtual Serial Port Wifi Map' title='Virtual Serial Port Wifi Map' />Delay library. The delay is virtual, during the delay, the code execution is continued. We can use multiple delays sequentially in a loop. We can use multiple delays simultaneously and independent of each other. The delay time can set in micro seconds or milli seconds. No hardware timers are used. The library is timer rollover safe. Virtual. Delay library download. You can download the library from Git. Hub. Questions. Please post any questions at the Arduino forum. Notes. The Virtual. Delay must always run inside a loop which is executed continuously. In contrast with the standard delay function, we need a start and an elapsed function. The delay time value can be between 0 and 2. Simple blinking LED sketch with the Virtual. Delay libraryinclude lt Arduino. Virtual. Delay. h. Pin 1. 3. Virtual. Delay single. Delay default millis. Modeled. Pin, OUTPUT. Delay. start4. 00 calls while running are ignored. Delay. elapsed digital. Writeled. Pin, bLED 4. Micro seconds Virtual. Delay exampleinclude avdwebVirtual. Delay. h. Virtual. Delay delayusmicros. Serial. begin9. 60. DOONCE delayus. Serial. Standard Arduino blocking delay Here a standard blinking LED sketch. Open the serial port and you can see that printing goes very slowly. Arduino. Streaming. Pin 1. 3. pin. Modeled. Pin, OUTPUT. Serial. Writeled. Pin, 1 this comes after the 7. Writeled. Pin, 0 this comes after the 1. Serial lt lt lt lt i since the cpu is being blocked, printing goes slowly. Deadlock. With a sequence of Virtual. Delays, each delay will wait on the foregoing by which the sequence cant start. This is a so called deadlock. To break the deadlock, one of the delays has to start one time. To do so, I have built a macro DOONCE. This is carried out only once in a loop, see the following example Using 3 Virtual. Delays in sequence. Here we need three separate Virtual. Delay instances delay. The line with the macro DOONCE ensures that the sequence is started. You may use any instance e. Arduino. h. include lt Streaming. Virtual. Delay. h. Virtual. Delay delay. Serial. begin9. 60. Serial lt lt ntest. Sequence. ifdelay. Iso 14001 Standard Pdf. Serial lt lt ndelay. Serial lt lt ndelay. Serial lt lt ndelay. DOONCEdelay. 1. Here is the serial output delay. Using multiple delays at the same time. In this example, we use 6 Virtual. Delays at the same time, this is not possible with the standard Arduino delay function. It is also showed how we can use the macro DOONCE multiple times in a loop. Arduino. Streaming. Virtual. Delay. h. Serial. Virtual. Delay delay. Serial lt lt n. DOONCE 1. Serial lt lt n. ONE SHOT 5. Serial lt lt n. ONE SHOT 1. DOONCESerial lt lt n. DOONCE 2 2. 25. 0ms lt lt millis test a second DOONCE. Serial lt lt n Repeat delay. Serial lt lt nsequence delay. Serial lt lt nsequence delay. Serial lt lt nsequence delay. Here is the serial output DOONCE 1. ONE SHOT 5. 50ms 5. Repeat delay. 6 7. ONE SHOT 1. 25. 0ms 1. Repeat delay. 6 7. Repeat delay. 6 7. DOONCE 2 2. 25. 0ms 2. One shot example. To create a one shot, start may only be called once during the loop, to do so, the macro DOONCE is used. Arduino. Streaming. Virtual. Delay. h. Virtual. Delay delay. Serial. Serial lt lt ntest. One. Shot 2sn. DOONCEdelay. Serial lt lt millis lt lt ms. The library has to be timer rollover proof. The 3. 2 bit millis and micros timers counts from 0, 1, 2 to 4. The millis timer is going to roll over after roughly 4. We have to take care about this rollover, because it may happen that we start the virtual delay just before the rollover time. After the rollover the timestamps will be messed up. The time compare part in the Virtual. Delay library is tricky, it compares 2 timestamps like this ifmillis time. Out However, this wont work, we have to use ifmillis time. Out 0Believe it or not, in this situation, both lines are not identical You can read all about this in the detailed story from Edgar Bonet. Phim 60S more. History. The Virtual. Delay library is quite simple, but the development has cost me a lot of time. The first library from 1. The library seemed to work well but after a year it turned out that there were situations in which it failed. The reason was that I had used a simple LED test, which caused that a serious shortcoming was not discovered. I had to make new library from scratch. This new library seemed to work well, also with a sequence of two delays. Later tests showed that there were problems with three and more delays sequentially. This again required a completely different approach. But now it turned out that there were problems with using multiple delays simultaneously and again a complete new library had to be made. Finally, I came to the conclusion that to solve all problems, it was necessary to use a start function and a macro DOONCE. Future expansions. Extra functions are possible like restart, pause, resume, stop, reset. Virtual. Delay development. Simple microseconds Virtual.