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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.
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.
LabVIEW 2012 or compatible
NI-DAQmx 9.5.5 or compatible
USB Data Acquisition Device (National Instruments USB-6009 with 12 DIO Ports)