The scheme of the LED spectrum analyzer contains such units as an operational amplifier, a control microcontroller, a binary to decimal decoder, and PNP and NPN transistor switches. Color ( 0, 0, 0 ) uint32_t gr = pixels. This 10-band LED sound spectrum analyzer consists of two parts a control printed circuit board and a LED matrix printed circuit board. Arduino Spectrum Analyzer with RGB-LED Stripe and MSGEQ7 by HeinzKetchup // declarations for the Neopixel by Adafruit #include #ifdef _AVR_ #include #endif #define PIN 4 // Pin for the RGB Stripe #define NUMPIXELS 70 // Number of Pixels Adafruit_NeoPixel pixels = Adafruit_NeoPixel ( NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800 ) int strobePin = 2 // Strobe Pin on the MSGEQ7 int resetPin = 3 // Reset Pin on the MSGEQ7 int outPin = A0 // Output Pin on the MSGEQ7 int level // An array to hold the values from the 7 frequency bands int l uint32_t aus = pixels.
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