VU-Meter

Fast and dirty VU-Meter with NeoPixel LedStrips and teensy lc for my home DJ Desk.
Maximum size with OLED, Config Menu and Serial Console < 64kb.

Features

• Mono/Stereo
• customizable number of leds
• 2 color effects
• Peak indicator
• build for teensy lc
• compatibel with all arduino boards
• compatibel with all neopixel strips
• Config saved in eeprom
• Serial Console for on the fly changes
• Optional: OLED display for config
• Optional: Rotary Encoder for config
• Optional: Trimmer for amplify factor

Example Setup with Keystone Modules

• LedStrip
• teensy lc
• Keystone Chassis
• PowerConnectors
• DataConnectors
• AnalogConnectors

Power supply 5V. max. current depends on number of leds.

Final build

Compile Arduino IDE

• Download Arduino IDE.
• Under Settings add Teensy Lib as additional Board Url
• After download, choose teensy board in options
• Add Adafruit_NeoPixel as library

Compile Platform.io with CLIon

• Download CLIon
• ...coming soon

Firstlight

led stripe modes

Two Strips

Dual Mode
6 6
5 5
4 4
3 3
2 2
1 1
D1 D2

One Strip, seperated

Stripped Mirror Folded
6 6 1
5 5 2
4 4 3
3 3 4
2 2 5
1 1 6
6 1 6
5 2 5
4 3 4
3 4 3
2 5 2
1 6 1
D1 D1 D1

Config Options

// Hardware Config
#ifndef CONFIG
#define CONFIG
// Use Stereo input. If mono then only left channel is used
#define STEREO
// Analog in pins
#define Left_IN A2
#define Right_IN A1
// Data out pins
#define LED_DATA_LEFT 2
#define LED_DATA_RIGHT 1
// led stripe modes
#define DUAL 1
#define STRIPPED 2
#define MIRROR 3
#define FOLDED 4
// Install poti, for onthefly calibration
#define CALIBRATION_POTI A3
// delay per loop, default 5ms
#define DELAY_MS 10
// Number of analog probes
#define NUMREADS 20
// OLED Display
#define OLED

Serial Console

Commands:

• load
• save
• dump
• set CONFIGVAR VALUE
• menu KEY (only if OLED is installed)

Configvars

• brightness [FLOAT]
• glowness [COLOR]
• peak_decay [FLOAT]
• peak_indicator [on|off]
• channel_decay [FLOAT]
• num_leds [INT]
• lowcolor [COLOR]
• midcolor [COLOR]
• highcolor [COLOR]

Menu keys (only if OLED is installed)

• up
• down
• left
• right
• click

Example

set brightness 0.1
set midcolor 0000FF
menu up
menu click
save

Install calibration trimmer (optional)

• Use a 10kOhm Poti
• connect outer pins to power and slider to an analog input
• the amplify setting is removed from settings while poti is installed

Install OLED (optional)

• without poti the amplify setting is in settings
• with poti the amplify setting is rendered in the lower area

Install Rotary Encoder (optional)

• needed for OLED Menu
• connect to power and 3 digital inputs

Upcoming

• more Color effects
• little filter circuit