Seven segment displays are usually a pain to use, as they require a lot of pins from a microcontroller to operate. Thankfully, Adafruit has made it a lot easier to use a seven segment display by giving you four digits that only require 2 wires from your microcontroller to operate. Even better, you can connect multiple displays together and still only use two pins. You can easily work one of these displays into your halloween project. Here are a few projects that use the Adafruit seven segment displays to give you some inspiration.
Great Scott! DeLorean-Inspired Time Circuit Clock!
Make a clock with a seven segment display, RTC, and an Arduino.
Geobox: a reverse geocache box that opens when you arrive at a certain destination.
Make a clock with a seven segment display and a Raspberry Pi.
Check out all of Adafruit’s seven segment display options here (there are a lot of color options).
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