On the Adafruit Forums, user fsbutko posts this really neat DIY fireworks controller build:

Since it is getting close to the July 4th holiday, I’d like to continue what’s become sort of a yearly tradition and share my DIY fireworks controller with everyone. The remote contains an Adafruit ItsyBitsy M0 on a custom circuit board along with an Adafruit NeoTrellis keypad and OLED character display.

The Field module which connects to your fireworks basically has a standalone Arduino Uno that controls a multiplexed arrangement of solid-state relays which provide the battery current to the electric igniters which in turn shoot off the fireworks. The remote controller and field module talk to each other over a pair of RFM69HCW 915MHz radio modules.

Please let me know what you think and any comments or suggestions, I’m always improving upon this system year after year.

See more on the video below and the forum post here