LinuxWorks Labs Audio Page

Some of my Arduino-related audio and other electronics projects:

LCDuino-1
An arduino-compatible i2c LCD backpack (libs and sample application can be found here).
Features:

"Backpack" board: Plug-in for industry-standard Hitachi-protocol 2x16 LCD modules

Atmel ATMEGA328P microcontroller onboard

Arduino-compatible (socketed, so user can upgrade controller chips as the become available)

Microchip MCP23008 I/O port expander onboard

I²C serial control interface

Additional analog & digital I/O lines

Optional onboard DS1302 real-time clock with its own crystal and supercap backup

LCD contrast adjustment trimpot

Reset pushbutton switch onboard

Power and pin 13 LEDs onboard

5V DC power, user-supplied, for module's input

Open-source, user-extensible firmware (add your own new features!)

Uses standard FTDI download USB cable support (not included)

Central platform for a series of future "application" or "personality " modules, including:

Audio preamplifier functions

Volume control

Analog & digital input/output routing and selection

Infrared remote control

Camera intervalometer (time-lapse exposure shutter/focus control)
Coffee/Espresso machine PID temperature control
Other possible uses where a nicely integrated IR remote control input, LCD display (and optional realtime clock) are needed

2-layer PCB with double ground planes

Prototype through-plated pads area on 0.1" grid for custom applications

Small form-factor: same outline as 2x16 LCD module

The LCDuino-1 is a joint project between AMB Laboratories and LinuxWorks Labs. It is currently under development.

SPDIFmaster
An arduino-controlled SPDIF digital audio input selector (switch).
Features:

Digital audio SPDIF switch
Controller is the LCDuino-1
Supports both coaxial and optical media types
Chip supports maximum of 8 ports (5 provided for on the PC board)
Onboard support for 1 RCA coax-in port; air-wire support for 2nd coax-in port
1 Toslink output (Toshiba footprint only)
All coax ports are Pulse transformer isolated
User-defined (short and long) names for each port, displayed on the LCD screen
PC board is designed to fit inside a standard hammond enclosure
Vishay IR receiver module is the sole method of remote control
Switch 'fabric' chip is CD4051
Coax input driver chip is uA9637
Toslink input blocks support both Toshiba and Sharp footprints
5v DC wall-wart provides power
Utilizes a learning IR receiver (currently, Sony IR; more to be added)
Fine control over backlight (digitally controlled), including configurable auto-fade (timeout) and total 'lights out' mode

DACmaster
A DAC user interface based on the LCDuino backpack.
Features:

This is just one example application, using a AMB Labs Gamma2 DAC
Firmware (source code) is general purpose and customizable to the feature set of the DAC being managed
Controls a hardware-configurable (ie, non-software mode) DAC such as the AMB Labs Gamma2 DAC
Controller is the LCDuino-1
Anti-clipping enable/disable selection
Filter A/B/C selection
Input port (SPDIF) selection
Optional interface (software and hardware) to Burr Brown PGA volume control chip
User-defined (short and long) names for each port, displayed on the LCD screen
PC board is designed to fit inside a standard hammond enclosure
Vishay IR receiver module is the sole method of remote control
Utilizes a learning IR receiver (currently, Sony IR; more to be added)
Fine control over backlight (digitally controlled), including configurable auto-fade (timeout) and total 'lights out' mode

ESPRESSOmaster
An espresso machine controller ("PID") application
Features:

Controls a Rancilio Silvia (or similar) espresso machine
Controller is the LCDuino-1
Uses solid state relay (SSR) to PWM control the heating element in the espresso machine
Onboard realtime clock and supercap 'battery' backup keep 24hour time
Brew mode and Steam/Froth mode
Safety auto-timeout on inactivity
Scrolling graph shows temperature, scaled for the most useful range
Display can be changed at any time between C and F degrees
LM35 as digital heating temperature sensor (via analog-in on the Arduino)
Vishay IR receiver module is the sole method of remote control
Utilizes a learning IR receiver (currently, Sony IR; more to be added)
Fine control over backlight (digitally controlled), including configurable auto-fade (timeout) and total 'lights out' mode

MVCmaster
A motorized volume control application
Features:

Controls a motorized potentiometer
Controller is the LCDuino-1 or a smaller arduino-compatible board (LCD optional)
Uses a common and popular solid state H-bridge (L293D) for motor control
Supports the VoluMaster(tm) method of dual-speed volume control ("fast-up", "slow-up", "fast-down", "slow-down")
Muting accomplished via relay (non-solid state)
Input selector logic available (relay-based)
Optional support for LCD (basic motor volume control does not need LCD)
Vishay IR receiver module is the sole method of remote control
Utilizes a learning IR receiver (currently, Sony IR; more to be added)
Fine control over optional LCD backlight (digitally controlled), including configurable auto-fade (timeout) and total 'lights out' mode

LCDuino-1 An arduino-compatible i2c LCD backpack (libs and sample application can be found here). Features: "Backpack" board: Plug-in for industry-standard Hitachi-protocol 2x16 LCD modules Atmel ATMEGA328P microcontroller onboard Arduino-compatible (socketed, so user can upgrade controller chips as the become available) Microchip MCP23008 I/O port expander onboard I²C serial control interface Additional analog & digital I/O lines Optional onboard DS1302 real-time clock with its own crystal and supercap backup LCD contrast adjustment trimpot Reset pushbutton switch onboard Power and pin 13 LEDs onboard 5V DC power, user-supplied, for module's input Open-source, user-extensible firmware (add your own new features!) Uses standard FTDI download USB cable support (not included) Central platform for a series of future "application" or "personality " modules, including: Audio preamplifier functions Volume control Analog & digital input/output routing and selection Infrared remote control Camera intervalometer (time-lapse exposure shutter/focus control) Coffee/Espresso machine PID temperature control Other possible uses where a nicely integrated IR remote control input, LCD display (and optional realtime clock) are needed 2-layer PCB with double ground planes Prototype through-plated pads area on 0.1" grid for custom applications Small form-factor: same outline as 2x16 LCD module The LCDuino-1 is a joint project between AMB Laboratories and LinuxWorks Labs. It is currently under development.
SPDIFmaster An arduino-controlled SPDIF digital audio input selector (switch). Features: Digital audio SPDIF switch Controller is the LCDuino-1 Supports both coaxial and optical media types Chip supports maximum of 8 ports (5 provided for on the PC board) Onboard support for 1 RCA coax-in port; air-wire support for 2nd coax-in port 1 Toslink output (Toshiba footprint only) All coax ports are Pulse transformer isolated User-defined (short and long) names for each port, displayed on the LCD screen PC board is designed to fit inside a standard hammond enclosure Vishay IR receiver module is the sole method of remote control Switch 'fabric' chip is CD4051 Coax input driver chip is uA9637 Toslink input blocks support both Toshiba and Sharp footprints 5v DC wall-wart provides power Utilizes a learning IR receiver (currently, Sony IR; more to be added) Fine control over backlight (digitally controlled), including configurable auto-fade (timeout) and total 'lights out' mode
DACmaster A DAC user interface based on the LCDuino backpack. Features: This is just one example application, using a AMB Labs Gamma2 DAC Firmware (source code) is general purpose and customizable to the feature set of the DAC being managed Controls a hardware-configurable (ie, non-software mode) DAC such as the AMB Labs Gamma2 DAC Controller is the LCDuino-1 Anti-clipping enable/disable selection Filter A/B/C selection Input port (SPDIF) selection Optional interface (software and hardware) to Burr Brown PGA volume control chip User-defined (short and long) names for each port, displayed on the LCD screen PC board is designed to fit inside a standard hammond enclosure Vishay IR receiver module is the sole method of remote control Utilizes a learning IR receiver (currently, Sony IR; more to be added) Fine control over backlight (digitally controlled), including configurable auto-fade (timeout) and total 'lights out' mode
ESPRESSOmaster An espresso machine controller ("PID") application Features: Controls a Rancilio Silvia (or similar) espresso machine Controller is the LCDuino-1 Uses solid state relay (SSR) to PWM control the heating element in the espresso machine Onboard realtime clock and supercap 'battery' backup keep 24hour time Brew mode and Steam/Froth mode Safety auto-timeout on inactivity Scrolling graph shows temperature, scaled for the most useful range Display can be changed at any time between C and F degrees LM35 as digital heating temperature sensor (via analog-in on the Arduino) Vishay IR receiver module is the sole method of remote control Utilizes a learning IR receiver (currently, Sony IR; more to be added) Fine control over backlight (digitally controlled), including configurable auto-fade (timeout) and total 'lights out' mode
MVCmaster A motorized volume control application Features: Controls a motorized potentiometer Controller is the LCDuino-1 or a smaller arduino-compatible board (LCD optional) Uses a common and popular solid state H-bridge (L293D) for motor control Supports the VoluMaster(tm) method of dual-speed volume control ("fast-up", "slow-up", "fast-down", "slow-down") Muting accomplished via relay (non-solid state) Input selector logic available (relay-based) Optional support for LCD (basic motor volume control does not need LCD) Vishay IR receiver module is the sole method of remote control Utilizes a learning IR receiver (currently, Sony IR; more to be added) Fine control over optional LCD backlight (digitally controlled), including configurable auto-fade (timeout) and total 'lights out' mode