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

Do not miss these articles

Do you like our articles? Do not miss any of them! You do not have to worry about anything, we will arrange delivery to you.

Related articles

Main products

WIZwiki-W7500 WIZNET
WIZNET

Ord.number: 196279

in stock 7 pcs

WIZwiki-W7500

Ethernet modules

Platform for W7500 MCU Arduino compatible

1 pcs+ 27,16 €

  • ADD TO CART
  • Get Quote
  • Add to favorites
  • Add to watchdog
  • Add item to compare
CA 56-12 SRWA KINGBRIGHT
KINGBRIGHT

Ord.number: 43953

Alternative components:

CA56-12SURKWA

CA 56-12 SRWA

7-Segment LED Displays

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

No longer available

Get Quote
BC547BBK DIOTEC
DIOTEC

Ord.number: 75754

in stock 5700 pcs

BC547BBK

Bipolar Transistors - Low-Power

Transistor NPN 0,1A/45V 0,5W TO92 Bulk P1,27

100 pcs+ 0,0174 €

200 pcs+ 0,0158 €

1000 pcs+ 0,0141 €

5000 pcs+ 0,0129 €

25000 pcs+ 0,0119 €

  • ADD TO CART
  • Get Quote
  • Add to favorites
  • Add to watchdog
  • Add item to compare
B3F-1052 OMRON
OMRON

Ord.number: 42620

in stock 770 pcs
(03/29/2024: 87 pcs)
(05/10/2024: 1500 pcs)
(06/03/2024: 500 pcs)

B3F-1052

Tactile Switches

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

5 pcs+ 0,3980 €

10 pcs+ 0,3160 €

50 pcs+ 0,2810 €

500 pcs+ 0,2460 €

1500 pcs+ 0,2320 €

  • ADD TO CART
  • Get Quote
  • Add to favorites
  • Add to watchdog
  • Add item to compare

Additional products


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

Resistor 0,6W 0207

Leaded Resistors

Ord. No.: 30789
Manufacturer: YAGEO
in stock 3100 pcs
(We are checking the delivery date: 5000 pcs)
50 pcs+
200 pcs+
1000 pcs+
5000 pcs+
15000 pcs+
0,0337 €
0,0152 €
0,0098 €
0,0075 €
0,0070 €
  • ADD TO CART
  • Get Quote
  • Add to favorites
  • Add to watchdog
  • Add item to compare

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

Resistor 0207 0,6W

Leaded Resistors

Ord. No.: 30867
Manufacturer: YAGEO
in stock 10000 pcs
(We are checking the delivery date: 10000 pcs)
50 pcs+
200 pcs+
1000 pcs+
5000 pcs+
15000 pcs+
0,0337 €
0,0152 €
0,0098 €
0,0075 €
0,0070 €
  • ADD TO CART
  • Get Quote
  • Add to favorites
  • Add to watchdog
  • Add item to compare

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

Resistor 0,6W 0207

Leaded Resistors

Ord. No.: 30981
Manufacturer: YAGEO
in stock 12000 pcs
(We are checking the delivery date: 5000 pcs)
50 pcs+
200 pcs+
1000 pcs+
5000 pcs+
15000 pcs+
0,0337 €
0,0152 €
0,0098 €
0,0075 €
0,0070 €
  • ADD TO CART
  • Get Quote
  • Add to favorites
  • Add to watchdog
  • Add item to compare

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

Aluminium Electrolytic Capacitor D4x7mm P1,5

Electrolytic Capacitors

Ord. No.: 19470
Manufacturer: JAMICON
in stock 650 pcs
50 pcs+
100 pcs+
1000 pcs+
3000 pcs+
12000 pcs+
0,0381 €
0,0347 €
0,0293 €
0,0281 €
0,0257 €
  • ADD TO CART
  • Get Quote
  • Add to favorites
  • Add to watchdog
  • Add item to compare

SJ-65 VARIOUS  
SJ-65

Flexible terminal contact set 65pcs

Other Cables

Ord. No.: 121582
Manufacturer: VARIOUS
in stock 37 pcs
1 pcs+
2 pcs+
5 pcs+
10 pcs+
4,90 €
4,70 €
4,17 €
4,00 €
  • ADD TO CART
  • Get Quote
  • Add to favorites
  • Add to watchdog
  • Add item to compare

BB-01 ( 640/200 ) VARIOUS  
BB-01 ( 640/200 )

Bread Board 840pins 66x174x8,5mm

Breadboards

Ord. No.: 45832
Manufacturer: VARIOUS
in stock 40 pcs
1 pcs+
10 pcs+
25 pcs+
50 pcs+
7,06 €
5,76 €
5,42 €
5,07 €
  • ADD TO CART
  • Get Quote
  • Add to favorites
  • Add to watchdog
  • Add item to compare
Do you agree with cookies being stored?
Welcome to the SOS electronic website. Before you enter our online world, we would like to ask you to allow us to store cookies on your browser. Your consent will help us view the site without error, measure its performance, and track additional statistics. Apart from that, we can bring you an offer of our products and services, literally tailor-made. We also provide cookies to third parties. However, you are definitely safe with us.
The proper operation of the website
More stable technical control
Better marketing offer

More about cookies
More about personal data processing

Necessary Only selected Accept all cookies