Feedback and Indicators

RADR provides visual, audio, and haptic feedback to communicate device state without requiring you to look at the screen.

LED System

RADR has three RGB LEDs (WS2812B) positioned around the device:

Position	Location	Primary Purpose
LED 0	Left encoder	Speed mode indicator
LED 1	Middle	Connection/play state
LED 2	Right encoder	Active mode indicator

LED Colors and Meanings

System States

State	LED	Color	HSV Value	Brightness
Searching/Scanning	All	Blue	150	255 (pulsing)
Idle (Main Menu)	All	Soft White	180	50
Device Connected	Middle	White	—	50
Paused/Stopped	Middle	Red	—	255

OSSM Control Modes

When controlling an OSSM, the encoder LEDs indicate the active mode:

Mode	LED	Color	Description
Speed	Left	Purple	Always active (speed is always controlled by left encoder)
Depth	Right	Coral/Red	Right encoder is adjusting depth
Sensation	Right	Blue	Right encoder is adjusting sensation
Stroke	Right	Green	Right encoder is adjusting stroke

LED Behavior Patterns

Pattern	Meaning
Solid	Static state (connected, paused, etc.)
Pulsing	Active scan or searching
Quick flash	Feedback for button press or mode change

Buzzer Patterns

RADR uses a piezoelectric buzzer (GPIO 2) to provide audio feedback for key events.

Boot Sound

Pattern: 4-note ascending sequence

Note	Frequency	Duration
1	523 Hz (C5)	100ms
2	659 Hz (E5)	100ms
3	784 Hz (G5)	100ms
4	1047 Hz (C6)	150ms

Played when RADR powers on.

Shutdown Sound

Pattern: 4-note descending sequence

Note	Frequency	Duration
1	1047 Hz (C6)	100ms
2	784 Hz (G5)	100ms
3	659 Hz (E5)	100ms
4	523 Hz (C5)	150ms

Played when entering sleep mode.

Device Connected

Pattern: 3-note ascending sequence

Note	Frequency	Duration
1	1047 Hz (C6)	80ms
2	1319 Hz (E6)	80ms
3	1568 Hz (G6)	120ms

Played when successfully connecting to a device.

Device Disconnected

Pattern: 3-note descending sequence

Note	Frequency	Duration
1	1568 Hz (G6)	80ms
2	1319 Hz (E6)	80ms
3	1047 Hz (C6)	120ms

Played when a device disconnects.

Paused

Pattern: Double beep

Note	Frequency	Duration
1	800 Hz	150ms
Gap	—	100ms
2	800 Hz	150ms

Played when pausing playback.

Play/Resume

Pattern: Two-tone ascending

Note	Frequency	Duration
1	1200 Hz	100ms
2	1400 Hz	100ms

Played when resuming playback.

Mario Coin (Easter Egg)

Pattern: Classic coin sound

Note	Frequency	Duration
1	2637 Hz (E7)	80ms
2	3136 Hz (G7)	300ms

Special feedback for certain interactions.

Vibration Feedback

RADR includes a vibration motor (GPIO 47) for haptic feedback. Vibration patterns generally mirror buzzer patterns, providing tactile feedback that works without sound.

Vibration Use Cases

Event	Vibration
Button press	Short pulse
Mode change	Quick vibration
Connection	Double vibration
Pause/Stop	Strong vibration

Vibration Pattern Timings

Pattern	Description	Pulse Durations (ms)
Single Pulse	Quick tap feedback	50
Double Pulse	Confirmation feedback	50, pause 200, 50
Triple Pulse	Strong confirmation	10, pause 50, 20, pause 50, 30
Error Pulse	Long error indication	500
Shutdown	Descending pulses	150, 100, 100, 100
Device Connected	Ascending pulses	100, 100, 150
Device Disconnected	Descending pulses	150, 100, 100
Paused	Double pulse	150, 150
Play/Resume	Quick double pulse	100, 100

Vibration feedback helps you operate RADR by feel, especially useful in low-light or when the device is out of direct view.

UI Color Scheme

RADR’s display uses a consistent color scheme:

Background Colors

Element	Color Code	Description
Background	0x10c5	Dark gray (Gray 900)
Text Background	White	Primary text color
Secondary Text	0xDEFB	Light gray
Disabled	0x1082	Very dark gray

OSSM Mode Colors

Mode	Color Code	Color Name
Speed	0x5013	Royal Purple
Depth	0xE186	Warm Coral
Sensation	0x3C9F	Ocean Blue
Stroke	0x4E8A	Forest Green

State Colors

State	Color
Active/Normal	White
Paused/Stopped	Red
Disabled	Dark Gray
Selected/Highlighted	Accent colors

Feedback Timing

Event	Response Time
Button press	< 10ms
Encoder change	< 10ms
Mode switch	< 50ms
LED color change	< 20ms

Tips for Using Feedback

Learn the buzzer sounds to operate RADR without looking. The connected sound (ascending) vs disconnected sound (descending) clearly indicates state.

The left LED (purple for speed) and right LED (mode color) tell you which parameter each encoder controls at a glance.

Red middle LED always means paused or stopped. White means active and ready.

Getting Started

Specifications

PCB

Printed Parts

LED System

LED Colors and Meanings

System States

OSSM Control Modes

LED Behavior Patterns

Buzzer Patterns

Boot Sound

Shutdown Sound

Device Connected

Device Disconnected

Paused

Play/Resume

Mario Coin (Easter Egg)

Vibration Feedback

Vibration Use Cases

Vibration Pattern Timings

UI Color Scheme

Background Colors

OSSM Mode Colors

State Colors

Feedback Timing

Tips for Using Feedback

​LED System

​LED Colors and Meanings

​System States

​OSSM Control Modes

​LED Behavior Patterns

​Buzzer Patterns

​Boot Sound

​Shutdown Sound

​Device Connected

​Device Disconnected

​Paused

​Play/Resume

​Mario Coin (Easter Egg)

​Vibration Feedback

​Vibration Use Cases

​Vibration Pattern Timings

​UI Color Scheme

​Background Colors

​OSSM Mode Colors

​State Colors

​Feedback Timing

​Tips for Using Feedback

LED System

LED Colors and Meanings

System States

OSSM Control Modes

LED Behavior Patterns

Buzzer Patterns

Boot Sound

Shutdown Sound

Device Connected

Device Disconnected

Paused

Play/Resume

Mario Coin (Easter Egg)

Vibration Feedback

Vibration Use Cases

Vibration Pattern Timings

UI Color Scheme

Background Colors

OSSM Mode Colors

State Colors

Feedback Timing

Tips for Using Feedback