Let’s get the flame code installed on the board before soldering anything. That way the electronics can all be tested before sealing everything inside the case.

If this is your first time using the Pro Trinket microcontroller, you’ll want to begin with our guide for setting that up. The Pro Trinket works a little differently from “normal” Arduinos are requires some extra installation and a different upload procedure:

Introducing Pro Trinket

To confirm that you have the driver installed and IDE properly configured, load the basic Arduino “blink” example sketch and try uploading to the board. If it won’t cooperate, work carefully through each of the steps in the guide linked above.

Do not continue until you have the “blink” sketch successfully working on the Pro Trinket board.

Then you can download the fire pendant sketch from Github:

A few things to be aware of regarding this sketch:

  • This is NOT good learning code for basic use of the LED matrix! Normally you’ll want to use the Adafruit_IS31FL3731 and Adafruit_GFX libraries (which provide drawing functions for pixels, lines, etc.).
  • The sketch is very specifically optimized for the Pro Trinket and won’t likely work on other boards.
  • It runs equally well on a 3V or 5V Pro Trinket…if you already have a 5V Pro Trinket around, that’s fine and you can use it…the 3V board is just a tiny bit more power-efficient and the battery will last a little longer. You may need to remove the part where we change I2C speed to 400 KHz but only do that if 400 KHz doesn't work on the Trinket 3.3V!

Open the FirePendant sketch in the Arduino IDE and upload it to the Pro Trinket board same way you did the “blink” sketch earlier…watch for the “Done Uploading” message. Nothing will happen, of course…we haven’t wired anything together yet…but having the code already in place makes troubleshooting easier later.

This guide was first published on Apr 15, 2016. It was last updated on Apr 15, 2016. This page (Software) was last updated on Apr 19, 2019.