I want to build a clock!

[badbarky]

Hey folks. I’m new to tinkering with projects like this and get scared when I see things like ‘attach to gpio’ or ‘search github’. Anyways I have a 7 segment display #812 from adafruit, a couple of trinket m0s, a Gemma, circuit playground, and rpi zeros. What is the best way to get a clock running? I teach elementary technology and I want to have it as a desk clock. I’ll probably house it in some of the wooden boards my daughter has been breaking in taekwondo! Thanks in advance.

[adafruit_support_bill]

Driving that display directly requires a lot of GPIO pins. You can simplify things greatly by using one of these: https://www.adafruit.com/product/877
That lets you drive the display with the i2c bus which requires only 2 pins. There is also a library for it to make the coding simpler as well.

Here is a simple clock project based on that display and backpack. You can substitute the M0 Trinket for the Metro. The RTC module is optional. But you can expect quite a bit of drift using the internal clock on the Trinket (or just about any microcontroller for that matter).

https://learn.adafruit.com/metro-minima ... ck-circuit