6 Digit 7 Segment HT1621 LCD Display Module with Arduino

   I buy from Gearbest an interesting lcd display with 6 digit 7-segment drived by HT1621 chip.

  I search informations about this display and Arduino development board and I find few articles, but more usefull was article from http://www.14core.com/wiring-the-6-digit-7-segment-2-4-inch-ht1621-lcd-display-module-on-microcontroller/. I test the schematic presented in article

with HT1621_test.ino sketch and on display is 23:45 clock with animated second and after 17 degree Celsius:

This mode can be see it on HT1621 6 digit 7 segment LCD display test video

   After some search and study I can put easy decimal point, so, using HT1621_test4.ino sketch, on display is a random hour clock with animated seconds indicator (between hour and minutes)

and random temperature (negative and positive)

   In HT1621 6 digit 7 segment LCD display - test 2 video you can see this display mode: