Build a Binary Clock with Elixir and Nerves

Prepare the Constant Current Driver

The TLC5947 will need several connections. There are many ways to solder together persistent connections. You might decide to solder individual components right onto the TLC5947, but that process is error prone, leading to hard-to-find bugs. Instead, you’ll use a more forgiving approach. You’ll solder on permanent header pins. That way, you can slide temporary jumper wires onto those headers to make connections. The compromise is a temporary connection, but one that’s easy to correct should you make mistakes.

Solder on the Headers

You will need to solder five headers to the board. One six-pin header will cover the inputs, and two long headers will cover each row of LED connections. When you’re done, your headers ...