Arduino Serial Output Buffer' title='Arduino Serial Output Buffer' />Arduino Time Sync from NTP Server using ESP8. Wi. Fi module. Time is the unit measuring our life. Every mechanism in the world of electronics and computers is based on time. Automation as a concept is defined by intelligent actions coordinated by time or in time. When talking about automation engineering, smart projects are driven by very precise triggers and calculations based on timing and synchronization. But how can we get the perfect time without manual adjustingOne way to accomplish that is by asking an NTP Server. In this article you will find everything about how to use ESP8. Arduino projects without an RTC external module. Note If you dont know what is an ESP8. Module I recommend you to read a complete review and tutorial here and then come back. What is NTP Server The NTP acronym stands for Network Time Protocol, a networking communication protocol for clock synchronization between network clients, operating since 1. The NTP job is to synchronize all network participants to Coordinated Universal Time UTC within a few milliseconds. To accomplish this task it uses the intersection algorithm, an agreement algorithm invented by Keith Marlzullo to estimate accurate time from different noisy sources. NTP can maintain time with a precision under 5. Internet and under 5 milliseconds in a LAN environment. In a more friendly description I would say that a NTP is a client server service that can be implemented by sending or receiving timestamps via UDP requests or by broadcasting multicasting. How can we use NTP Servers NTP implementations can be found in many applications. Your operating systems most probably get the time from a NTP server, time servers, databases, weather stations, brokerage and online market exchange applications also get benefits from NTP servers by requesting accurate time. In order to interrogate an NTP server your environment should be able to open an UDP connection on a local port and then send and receive UDP packages in the same network with the server. The packages received are containing multiple information like UNIX timestamp, accuracy, delay or timezone and many development environments are providing friendly methods to extract the data in a pretty objectual format. How accurate is an NTP serverBefore knowing how accurate an NTP server can be you need to know its architecture. A NTP server is is a hierarchical, semi layered system of levels of clocks. See below NTP strata levels There are many factors that can affect the accuracy of time synchronized by NTP. Mixvibes Pro Full Version. A visible influence can have the following Speed latency of the client internet connection. Strata of the time servers chosen for synchronization. Signal distance from the servers including to and from orbiting satellites. Arduino Serial Output Buffer CircuitThe quality and complexity of the software algorithm used. Note To have a better accuracy is recommended to choose servers that are physically close to your exit point internet provider end point. This will lessen the chance that the signal is not routed up to a geostationary satellite. Public server examples Global www. Asia www. pool. ntp. Iran www. pool. ntp. Typically, the URL will be something like x. Arduino code example for ESP8. Replies to Android USB Host Arduino How to communicate without rooting your Android Tablet or Phone. A program showing how to connect 1Wire devices Dallas, aka MicroLan to Arduino by letting a Peter Anderson OneWire Controller do the heavy lifting. NTP Server pooling. In order to get data from the NTP server we need to program the ESP module to be an UDP Client. I prefer to program the ESP8. Arduino IDE, but the same result can be achieved with LUA code or via AT Commands. To accomplish that with Arduino, I used two available libraries ESP8. Wi. Fi. h and Wi. Fi. Udp. h. First library allow and manage Wi. Fi connections while the second handle sending and receiving UDP packages. Both libraries are available after installing the ESP8. Arduino IDE. Replace SSID and password with your home router Wi. Fi credentials, replace the ntp. Server. Name with the server you want to get time from and upload the following code to your ESP. You can point a direct IP address of the NTP Server but most likely you will loose the POOL benefits. Arduino Time Sync from NTP Server using ESP8. Wi. Fi module. Arduino code example. ESP8. 26. 6Wi. Fi. Wi. Fi. Udp. h. SSID name. Port 2. 39. 0 local port to listen for UDP packets. Dont hardwire the IP address or we wont get the benefits of the pool. Lookup the IP address for the host name instead. IPAddress time. Server1. NTP server. IPAddress time. Server. IP time. NTP server address. Server. Name time. NTPPACKETSIZE 4. NTP time stamp is in the first 4. Buffer NTPPACKETSIZE buffer to hold incoming and outgoing packets. A UDP instance to let us send and receive packets over UDP. Serial. begin1. 15. Serial. println. Serial. We start by connecting to a Wi. Fi network. Serial. Connecting to. Serial. Wi. Fi. beginssid, pass. Wi. Fi. status WLCONNECTED. Serial. print. Serial. Serial. printlnWi. Fi connected. Serial. IP address. Serial. Wi. Fi. local. IP. Serial. printlnStarting UDP. Port. Serial. printLocal port. Serial. printlnudp. Port. get a random server from the pool. Wi. Fi. host. By. Namentp. Server. Name, time. Server. IP. send. NTPpackettime. Server. IP send an NTP packet to a time server. Packet. Serial. Serial. Serial. printlncb. Weve received a packet, read the data from it. Buffer, NTPPACKETSIZE read the packet into the buffer. First, esxtract the two words. Word wordpacket. Buffer4. Buffer4. 1. unsigned long low. Word wordpacket. Buffer4. Buffer4. 3. combine the four bytes two words into a long integer. NTP time seconds since Jan 1 1. Since. 19. 00 high. Word lt lt 1. Word. Serial. printSeconds since Jan 1 1. Serial. printlnsecs. Since. 19. 00. now convert NTP time into everyday time. Serial. printUnix time. Unix time starts on Jan 1 1. In seconds, thats 2. Years 2. 20. 89. UL. Since. 19. 00 seventy. Years. print Unix time. Serial. printlnepoch. Serial. printThe UTC time is UTC is the time at Greenwich Meridian GMT. Serial. printepoch 8. L 3. 60. 0 print the hour 8. Serial. print. In the first 1. Serial. print0. Serial. Serial. print. In the first 1. Serial. print0. Serial. NTP request to the time server at the given address. NTPpacketIPAddress address. Serial. printlnsending NTP packet. Buffer, 0, NTPPACKETSIZE. Initialize values needed to form NTP request. URL above for details on the packets. Buffer0 0b. 11. LI, Version, Mode. Buffer1 0 Stratum, or type of clock. Buffer2 6 Polling Interval. Buffer3 0x. EC Peer Clock Precision. Root Delay Root Dispersion. Buffer1. 2 4. Buffer1. E. packet. Buffer1. Buffer1. 5 5. NTP fields have been given values, now. Packetaddress, 1. NTP requests are to port 1. Buffer, NTPPACKETSIZE. Packet. This code example was inspired from here. Open your Serial monitoring terminal and reset the ESP module. You should see a result like this In this example I used a global NTP server time. Europe it is not the best choice. For my projects I use an NTP Server which is closer to my physically location like in the following example const charntp. Server. Name 0. To get the NTP that match your location go to www.