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We appreciate your patience as we improve our online experience.
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Overview
These are the VI's we used to both set off a firework with handclapping and to set off 24 fireworks synchronized to a song.
Description
The goal of this project was to create a fireworks show automatically synchronized to a song using beat detection analysis and simple, low cost data acquisition hardware.A song is imported into software for analysis; a Fourier Transform is then used to compare the power of a selectable frequency band to the average power in that band to detect a beat. When a beat is detected, a digital high is sent out through a USB-DAQ device. This device is wired as the base of a Darlington Pair Transistor that will switch on a high current power supply connected to the firework triggering method.
BEAT DETECTION METHOD
A Fourier Transform is taken of the song so the varying powers of the different frequencies can be observed. A certain frequency band is then isolated (such as the bass of the song to watch for kickdrum beats) and the power of that frequency band is measured. A running average of the past X number of power measurements is calculated and compared to the current power. If the current power of the band rises above the running average this is defined as a beat.
HARDWARE FIRING METHOD
A USB-DAQ device is wired to the Base of a Darlington Pair Transistor. When a digital high signal is sent from the DAQ device the transistor will switch, allowing a power supply to flow through the igniter. The igniter is comprised of a low resistance, low power resistor coated with pyrotechnic material. When the current from the power supply flows through the igniter’s resistor it overheats and ignites the pyrotechnic material, lighting the firework it is embedded in.
Requirements
Software
Hardware
USB Data Acquisition Device (National Instruments USB-6009 with 12 DIO Ports)
TIP120 Darlington Pair Transistor
24 Volt DC, 1 Amp Power Supply
LabVIEW with Sound and Vibration Toolkit
Electronic Match
C6-0 Estes Model Rocket Engine
Omni-directional Spark Charge
Kerosene Charge
Steps to Implement or Execute Code
Additional Information or References
**This document has been updated to meet the current required format for the NI Code Exchange.**
Example code from the Example Code Exchange in the NI Community is licensed with the MIT license.
Very cool, guys!