IoT Watch with Wiznet W7500

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.

Hardware
WIZwiki-W7500: 1ks (Cortex-M0 Platform board)
LED display Common-Anode Typ, 7-Segment : 2EA
BC547 : 8EA
Tact Switch : 1EA
220Ohm Resistor : 16EA
1kOhm Resistor : 8EA
10kOhm Resistor : 1EA
1uF : 1EA
Jumper Wires
Bread Board

As shown on the circuit image, the A~G pins from 7 segment display are parallely connected to WIZwiki-W7500. Common pins can be optionally connected 3.3V using npn transistor.
https://blog.wiznettechnology.com/category/w7500/

The test
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.

Firmware Code
The firmware is programmed on the mbed on-line compiler. If you click on below link, you can get the source code.
https://developer.mbed.org/users/nanjsk/code/SNTP_7SEG_WIZwiki_W7500/

Videos

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WIZwiki-W7500 WIZNET  
WIZwiki-W7500

Platform for W7500 MCU Arduino compatible

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CA 56-12 SRWA KINGBRIGHT  
CA 56-12 SRWA

LED Display 7-segment 4-digit 0.56"(14.22mm) Red 640nm

7-Segment LED Displays

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BC547BBK

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Bipolar Transistors - Low-Power

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B3F-1052

Tactile Switch 6x6mm Momentary 0-(1) SPST 50mA 24VDC H=7,3mm 1,5N THT

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RM 1% 220 R (MF0207FTE52-220R) YAGEO  
RM 1% 220 R (MF0207FTE52-220R)

Resistor 0,6W 0207

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RM 1% 1 K (MF0207FTE52-1K) YAGEO  
RM 1% 1 K (MF0207FTE52-1K)

Resistor 0207 0,6W

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RM 1% 10 K (MF0207FTE52-10K) YAGEO  
RM 1% 10 K (MF0207FTE52-10K)

Resistor 0,6W 0207

Leaded Resistors

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SS 1uF 63V 85°C (SSR010M1JC07M) JAMICON  
SS 1uF 63V 85°C (SSR010M1JC07M)

Aluminium Electrolytic Capacitor D4x7mm P1,5

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SJ-65 VARIOUS  
SJ-65

Flexible terminal contact set 65pcs

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BB-01 ( 640/200 )

Bread Board 840pins 66x174x8,5mm

Breadboards

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