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.