NTP clock on two 8x8 led matrix

This clock is made to use few components:

• a development boardwith ESP9266 or stand alone ESP8266-01
• 2 MAX7219 matrix led display
• few wire
• 5V power supply.

Schematic is very simple:

I have this rype of MAX7219 matrix led module:

- upper side

- bottom side

So, test clock montage is:

I was inspired by article from https://www.hackster.io/garysat/arduino-cheap-minimal-parts-digital-clock-0d750a but I use another type of led display, so I must changed from zero numbers using an online calculator (https://www.riyas.org/2013/12/online-led-matrix-font-generator-with.html):

I have a movie on internet, see

PS: You can find mo re info in my articles from:

- https://nicuflorica.blogspot.com/2020/02/pseudoceas-pe-2-matrici-de-8x8-leduri.html

- https://nicuflorica.blogspot.com/2020/02/ceas-ntp-pe-2-afisaje-de-8x8-leduri-16x8.html