Big 7 segment display

A clock controlled by a ESP8266, which shows the time and functions as a stopwatch.

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I want to build a clock controlled by a ESP8266, which shows the time and functions as a stopwatch. The idea is to use two LEDs for each segment inside a glue tube, that way it acts like a neon light.

Perfore el tube de pegamento para que entre el led en cada extremo.

Then insert the glue stick with the led into the soda lid.

Join all the GND contacts in one wire; a join the positive contact of the led's of each segment. 

I don't use a 74hc595 to control the led's, because a don't have four of them right now, instead i use a MC23017 to control the 7 segments.

The circuit is really basic:

The schematic is this

On the MCP23017 the pin's number 1 to 8 and 21 to 28 will be connected to the leds.

  • 1 × ESP8266
  • 2 × led by segment. 14 for digit
  • 1 × 100 ohm resistor
  • 2 × 10k resistor
  • 1 × MCP23017 Microprocessors, Microcontrollers, DSPs / IO Controllers

View all 7 components

  • 1
    Testing the idea, with one digit
  • 2
    I built the remaining three digits

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Wrrr wrote 04/25/2019 at 08:18 point

A very cool way of using these 'resources'..
Thanks for sharing!

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salmanisheikh wrote 04/24/2019 at 19:09 point

very cool project. I got glue sticks, leds and bottle caps..going to make one and try it out. 

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Guille wrote 04/24/2019 at 21:18 point

Thanks! I glad you liked, i need to buy more glue sticks to finish the build the others  digits.

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