README.md

AudioRGB

 

Arduino Uno

Pin Configuration

Pin	Mode	Label	Component	Data
6	pwm output	LED_L_R	LED left	red
5	pwm output	LED_L_G	LED left	green
3	pwm output	LED_L_B	LED left	blue
11	pwm output	LED_R_R	LED right	red
10	pwm output	LED_R_G	LED right	green
9	pwm output	LED_R_B	LED right	blue
2	input pull-up	TCH_1	touchpad	pad 1
4	input pull-up	TCH_2	touchpad	pad 2
7	input pull-up	TCH_3	touchpad	pad 3
8	input pull-up	TCH_4	touchpad	pad 4
A0	input	AUX_L	analog audio	left channel
A1	input	AUX_R	analog audio	right channel
A2	input	RNG_1	none	noise
A3	input	RNG_2	none	noise

Results

Random walk by analog reading of noise from pin A2

Graph	Data
blue	random walk

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Fade random color in / out while playing music

Graph	Data	Value
yellow	audio	volume
purple	filtered audio	volume
red	red value	brightness
green	green value	brightness
blue	blue value	brightness

Nucleo-64

Pin Configuration

Pin Name	GPIO mode	GPIO Config	User Label	Component	Data
PB6	pwm output	TIM4_CH1	LED_R	LED left	red
PC7	pwm output	TIM3_CH2	LED_G	LED left	green
PB4	pwm output	TIM3_CH1	LED_B	LED left	blue
PA1	analog input	12 bit	AUX_L	analog audio	left audio channel
PA4	analog input	12 bit	AUX_R	analog audio	right audio channel
PC2	analog input	12 bit	RNG	none	noise
PA2	USART asynchronous	115200 baud	USART2_TX	Serial Interface	debug data

Results

UART record while playing music

Graph	Data	Value
blue	audio	volume
red	filtered audio	volume
green	color	brightness
yellow	saturated color	brightness

Miscellaneous

Audio-Jack Pin Configuration

Pin Name	Cable Color	Data	Resistance
Tip	blue	left channel	$\sim1\Omega$
Ring	orange	right channel	$\sim2\Omega$
Sleeve	black	ground	$\sim3\Omega$

Differences between ARM- and AVR-assembly

See Compiler Explorer