It's based on the ESP8266, and it may drive one or more 8 digits seven segment MAX7219 displays.
In this post here I would like to share with you a double line 8 digits seven segment PCB board. Ready to be printed and builded.
Also, I attache here the CAD files that you can use to print you own box for this counter.
The board was built using Eagle.
The seven segments module that i use are the HS420361K-32, which is a common cathode module with the following wiring.
pin 01: E
pin 02: D
pin 03: dp
pin 04: C
pin 05: G
pin 06: dig4
pin 07: B
pin 08: dig3
pin 09: dig2
pin 10: F
pin 11: A
pin 12 dig1
Please find the connection diagram below. Of course the wiring of 4 bit seven segment modules changes by the model you use, so pay attention to your wiring scheme.
Code
Notes
- read risk disclaimer
- excuse my bad english