Jeremy S. Cook  - 1 S1w2rSkxZKk3TeoZmIzYlQ - Accelerometer-Enabled Harry Potter Wands Cast Spells in Sound and Light

In his latest video, wermy, AKA sudomod, was asked to help with a trivia tournament. While they wanted a buzzer system to determine which player had an answer, he wasn’t content with simple buttons for this magical event, and instead made wizardly interface devices in the form of .

Inside each rather thick wand, wermy embedded an nRF24L01 transceiver module, along with a battery, a LiPo charger, an Adafruit ItsyBitsy M0 Express, and an MP-6500 inertial measurement unit. When a player “buzzes” in by flicking the wand, a signal is sent to a base unit that runs on an Adafruit Feather 32u4 Basic Proto board with another nRF24L01 module. This emits a spell , and activates a strip of LEDs that zip from one player to another. LEDs are placed behind a castle-themed cloth, which provides an excellent diffuser, and largely conceals the electronics, allowing people to instead focus on the quiz and spell effect.

In addition to the wands, a host remote also interfaces with the base unit, enabling the person running the event to pause the game, signal that a question is , and input that a correct or incorrect response has been entered. This device runs on an Adafruit Feather M0 Express, and contains yet another nRF24L01. As seen in the video below, it’s a fun setup, and from a technical standpoint, it’s a great illustration of how several wireless transceiver modules can be used together for multi-node control.

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