Large 7-segment neon display on the ESP8266

I needed to make a large-sized electronic display with a stopwatch function and a neon glow.

To control the chip was chosen ESP8266, in which both the clock function and the stopwatch are implemented.
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To get a neon glow, I used hot melt glue cylinders. I glued one LED to the end of each tube.





Components Used:

1 × ESP8266;
2 LEDs per tube, total 14 pcs. for one digit;
1 × 100 Ohm resistor;
2 × 10 kΩ resistor;
1 × MCP23017

I connected all the “cathode” contacts into one common wire, and connected the anodes of the LEDs with the control circuit.



I used MC23017 to manage my seven segments. It would be more logical to use four 74hc595, but I didn’t have a complete set, and I really wanted to do the neon display as quickly as possible.



The display is shown above.



Appearance of the current watch segment



Roller

How I made a clock from the display, I will tell in my next article.