This article explains how to make a simple network watch with 7 segment LED display. The watch gets time information from network using SNTP (Simple Network Time Protocol) and displays the current time on the 7 segment display using RTC (Real Time Clock).
This is an archive article published 11/03/2016. Some information may no longer be up to date and in line with the current state. Please contact us in case of interest.
The good old 7-segment display was widely used at the end of last century. I’m sure you still have some in your desk drawer. It is a “low cost” alternative to matrix LED display.
SNTP (Simple Network Time protocol) is the network protocol for time synchronization on the Internet. RTC provides the current time information. It counts the date, time, minute and second by operating independently from the MCU or CPU.
If you watch the demonstration movie, when the WIZwiki-W7500 is reset, it acquires the time information from NTP server. If the RED LED is on, it means the time information is successfully acquired from NTP server. The time information is registered to RTC. The current time of RTC is displayed on the 7 segment LED display.
Whenever you press the switch, the time and data information is alternately displayed on the display.
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