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1. #EASYTIME CLOCK WIFI SETUP HOW TO#
2. #EASYTIME CLOCK WIFI SETUP SERIAL#
3. #EASYTIME CLOCK WIFI SETUP CODE#
4. #EASYTIME CLOCK WIFI SETUP PASSWORD#

In the case of the Arduino core, only a single time server is supported.Īfter this, the sntp_init function is called, which takes care of the initialization of the SNTP module with the previously defined configurations. This function receives as first input the number of the server and as second the address of the server. This is done after with a call to the sntp_setservername function. In the case of the Arduino function we have invoked, as already mentioned, the mode is SNTP_OPMODE_POLL, which means the address of the time server needs to be specified. The difference between these two modes seems to be related with the two operating modes defined in the SNTP RFC: unicast and broadcast. First, it calls the sntp_setoperatingmode function, passing as input the SNTP_OPMODE_POLL mode.Īlthough I did not find many documentation about the supported modes, the information I’ve found here and here seem to indicate the existence of the two following constants: This function starts by configuring and initializing the SNTP synchronization. We will start by analyzing the configTime function.

As such, it is important to understand what they do under the hood, to better understand how our program will behave. These functions are Arduino abstractions implemented on this file.

#EASYTIME CLOCK WIFI SETUP CODE#

In the code from the previous section, we have used two important functions: configTime and getLocalTime.

#EASYTIME CLOCK WIFI SETUP SERIAL#

As can be seen, we get the time information periodically printed to the monitor.įigure 1 – System time information, printed to the Arduino IDE serial monitor. You should obtain a result similar to figure 1. Once the procedure is finished, open the Arduino IDE serial monitor. To test the code, simply compile it and upload it. Serial.println("Connected with success") Serial.print("Number of years since 1900: ") Serial.println("Could not obtain time info")

#EASYTIME CLOCK WIFI SETUP PASSWORD#

You can check also here the countries that have DST periods.įor the third argument we will simply pass the global string we have defined early, which contains the URL for the server.Ĭonst char* password = "yourNetworkPass" Ĭonst char* ntpServer = "" As such, I should pass a value of 3600 seconds. Regarding the second argument, at the time of writing, Portugal is on DST period, meaning the clocks are advanced by 1 hour. Don’t forget to convert the value to seconds.

You can check here a list of countries and find your time zone. Thus, I will pass the value 0 for the first argument. Since I’m located in Portugal, I’m in GMT (also called GMT+0). Daylight Saving Time (DST) is the practice of advancing clocks, typically one hour, during warmer months, so that darkness falls at a later clock time.

To finish the Arduino setup, we will now take care of defining the time zone of our device and the set the SNTP server. We will need the WiFi.h, to be able to connect the ESP32 to a WiFi network. We will start our code with the library includes. The tests shown below were performed on a ESP32-E FireBeetle board from DFRobot. The code below is based on the time example from the Arduino core, which I encourage you to check. We are not going to focus in that part of the system, but it is important to be aware about these time sources and their accuracy on timekeeping, which may be relevant for your application requirements. That is achieved with either one or two internal time sources, as described here. It’s important to take in consideration that the application will only sync time with the time server periodically, meaning that the ESP32 will need to keep the system time between those syncs. In the section “ Analyzing the Arduino functions” below, we will also do a quick analysis on some of the IDF APIs called under the hood by the Arduino core functions.

Nonetheless, those are implemented on top of ESP32 IDF’s system time API, which I recommend you to read to have a better understanding on how the system time behaves. In our simple code example below, we are going to use two Arduino core functions that simplify much the configuration of the system time zone and initializing the SNTP synchronization. If you are interested in the low level details of the protocol, you can consult the RFC. We are going to use the Simple Network Time Protocol (SNTP) to do the synchronization of the ESP32 time with a time server.

#EASYTIME CLOCK WIFI SETUP HOW TO#

In this tutorial we are going to learn how to configure the system time on the ESP32 and how to obtain the current time, using the Arduino core.