An IoT watch with Wiznet W7500


An IoT watch with WIZnet W7500


The good old 7-segment display was used extensively towards the end of the last century. It is a kind of electronic display for displaying decimal numbers, which was a cost-effective alternative to the more complex matrix displays. Somewhere in a drawer you will surely find a copy. SNTP (Simple Network Time Protocol) is a network protocol used to synchronize Internet time. The Real Time Clock provides the current time information. It counts the date, time, minutes, and seconds through independent MCU or CPU operation.

WIZwiki-W7500 : 1EA (Cortex-M0 Platform board)
LED Display Common Anode Type, Array 7 Segment: 2EA
BC547 : 8EA
tact switch : 1EA
220Ohm resistance : 16EA
1kOhm resistance : 8EA
10k resistance : 1EA
1uF : 1EA
jumper wires
The A ~ G pins of the 7-segment display are connected in parallel with the WIZwiki W7500 board, as shown in the diagram above. By using a npn transistor of 3.3 V, general pins can be optionally connected.The test 
As you can see in the demonstration movie, when the WIZwiki W7500 board is reset, the time information is retrieved from the NTP server. If the RED LED is on, this means that the time information is successfully retrieved via the NTP server. The time information is recorded in the RTC. The current time of the RTC is displayed on the 7-segment display. Each time the switch is operated, the time and date information is displayed alternately on the 7-segment display.

code The firmware is programmed on the mbed-Online compiler. If you click the link below, you can get the source code.



Source :
Tag : 201603, W7500, NTP, RTC


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