bastelschlumpf / spectrumleds Goto Github PK

7 band microphone spectrum analyser leds with wifi interface.

Prototype

Circuit Board

Wifi interface

This board samples environment sounds with an external microphone and calculate the 7 band sound spectrum with a software fast fourier transformation and display the result on an 7 RGB led lines.

The main component of the systems are:

• A NodeMCU ESP32 board
• MAX4466 microphone
• 5V 20A AC/DC power supply
• 140 x WS2812B RGB led
• 2 x Electrolytic Capacitor 1000uF

I don't take any responsibility nor liability for using this software nor for the installation or any tips, advice, videos, etc. given by any member of this site or any related site.

This program is licensed under GPL-3.0

Here are some sample shopping items. Please check the details if everything is correct.

Label	Price	Image	Sample URL
NodeMCU-32S	12 CHF		https://www.bastelgarage.ch/nodemcu-32s-esp32-wifi-bluetooth-entwicklungs-board
WS2812B 140 RGB LEDs	52 CHF 14 pcs		https://www.bastelgarage.ch/ws2812b-60led-m-led-neopixel-strip-0-165m?search=ws2812b
MAX4466 microphone	6 CHF		https://www.bastelgarage.ch/max4466-mikrofon-verstarker-modul-mit-poti?search=max4466
5V 20A AC/DC	30 CHF		https://www.bastelgarage.ch/5v-20a-ac-dc-100w-schaltnetzteil-s-100-5?search=5v%20100w
1000uF Capacitor	2 CHF 2 pcs		https://www.bastelgarage.ch/elektrolyt-kondensator-1000-f-25-v?search=1000
100 Ohm resistor	1 CHF		https://www.amazon.de/Metallfilm-Widerstand-100-Ohm-Stück/dp/B00AES20G0/ref=sr_1_3_sspa
Diode	1 CHF		https://www.amazon.de/1N4007-Diode-Gleichrichterdiode-1000-Stück/dp/B017HTKGL4/ref=sr_1_1

140 x WS2812B RGB LED means ~ 140 x 63 mA = 8.82 A. You can use a power supply with less power (10A should be enough). The material price should be approx. 100 CHF.

• https://www.arduino.cc Thanks to the Arduino community with all its incredible possibilities and support.*
• http://fritzing.org/home Thanks to the fritzing team for this very intuitive usable software. I could create my circuit in Fritzing with only a half day.