In this post, we will learn how to construct an analog/digital OLED clock using NodeMCU that is based on the Internet of Things (IoT). There is no requirement for an RTC Module of any kind, such as DS1307 or DS3231. Simply the current time and date will be retrieved from a server located online. The time that was downloaded can be shown either analogically or digitally at your option.

NodeMCU - ESP8266-12E Board OLED Display - 0.96" I2C OLED Display Connecting Wires Breadboard

This is a blue OLED display module with a 0.96-inch screen. SPI and IIC protocols can be used to create an interface between the display module and any microcontroller. This image has a resolution of 128 by 64 pixels. Display board, display, and a male header with 4 pins that has been pre- soldered to the board are all included in this package. Organic Light-Emitting Diodes, also known as OLEDs, are a type of self- illuminating technology that are made up of a multi-layered organic film that is very thin and is sandwiched in between an anode and a cathode. OLED technology, on the other hand, does not require a backlight, in

contrast to LCD. It is widely acknowledged that organic light-emitting diode (OLED) technology represents the pinnacle of innovation for the next generation of flat-panel displays and boasts a great application potential for nearly every type of display.

With the help of the below Circuit diagram, you can make IoT Based Analog/Digital OLED Clock using NodeMCU. Therefore, construct the circuit in the manner depicted in the image. Establish the connection between the SCL Pin of the OLED and the D1 Pin of the NodeMCU. Connect the SDA pin of the OLED to the D2 pin of the NodeMCU, as well. Join the 3.3V and GND pins of the OLED to the corresponding pins on the NodeMCU.

The Arduino Integrated Development Environment (IDE) is used to construct a sketch that precisely sets the date and time by accessing an NPT time server. After that, the date and time are shown on an OLED display,

and they are also visible in a web browser that is connected to the ESP8266 webserver. On this web page, you have the ability to specify variables such as the Time Zone, 24-hour clock, daylight savings time, and a variable to manage the time server update interval. AJAX is being used on the website to keep the time current without having to completely reload the page. The NTPClient library establishes a connection between the ESP8266 WiFi and a time server; the latter then provides the module with accurate time data. Network Time Protocol is abbreviated as NTP. The final one is the Arduino Time library, which translates Unix timestamps, also known as the Unix epoch, into seconds, minutes, hours, days of the week, months, and years. The number of seconds that have passed since the start of the Unix operating system on January 1, 1970 (midnight UTC/GMT) is referred to as the epoch. The time server transmits the time in the Unix epoch format, which needs to be translated. This library accomplishes all of the work necessary to convert the time. The NTPClient library is setup to obtain time information (Unix epoch) from the server time.nist.gov (GMT time), along with an offset of 1 hour (==> GMT + 1-time zone), which is equal to 3600 seconds, as specified in the RFC.