NGALAC/Subsystems

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Power

Streaming PC

BIOS setting for Auto-on with power-on (e.g. from switch)

Audio

Gainclones are a DIY version of a $3000 audio system called the GainCard.

NGALAC possesses a LM3886TF based dual supply amp which requires a split rail +28/-28 DC supply

Amazon Link

LM3886TF based gainclone amp

Example DIY circuits which are easy to build with clear instructions

Example Circuits

Example PSU design

DIY PSU price is very high, will compare to purchase options

Using computer PSU may be possible after boosting +/-12 to +/-28, however, current on -12V line may not be enough to rate maximum wattage

Possible DIY Design

Qty	Short Name	Price	Part	Link	Part Total
1	Transformer Dual 28V secondaries, 4.6A Max current	$28.00	VPS56-2300	Digikey	$28.00
16	Diode	$1.00	MUR860	Digikey	$16.00
4	Linear Voltage Regulator	$2.10	LM338T	Digikey	$9.00
8	Rectifier Diode	$0.20	LM4002	Digikey	$1.60
4	1200uF Radial Aluminum Electrolytic Caps	$1.00 - $6.00 (depending on current)	EEU-FS1J102B	Digikey	$24.00
*	Various Caps and Resistors (1W)	$10.00	*	*	$10.00
Total					$95.00

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Electrical

• Ground everything and very well, especially anything the human touches.

OBS automation

inputs -> Arduino/RaspberryPi <-> CmdMessenger <-> Serial port <-> USB <-> streaming CPU <-> PyCmdMessenger <-> obs-wc-controller <-> obs

Guardian Process - Windows OBS restart automatically on fail strategy

OBS Web Socket Plugin	Sets up a websocket API for OBS
obs-wc-rc	Python library to interface with OBS websocket API
PyCmdMesssenger	Python library for CmdMessenger using serial port
CmdMessenger for Arduino	Arduino CmdMessenger library to communicate with PyCmdMessenger on server via serial port

OBS websocket plugin

obs-wc-rc

Query and send commands to OBS from python (can theoretically control everything)

Arduino

• Debounce buttons
• better debounce - digital filter based
• Pressure switch for "player in front of machine"
• Note: arduino.ArduinoBoard(enable_dtr=False) See: ##Known Issues in PyCmdMessenger

Arduino code using CmdMessenger library for talking through serial port to python orchestrator

Python code to pair with CmdMessenger

First 3 states are switches set high or low

Last 3 are LED states (or anything else)

Can trigger LED strips or whatever else as we wish, run pre-defined patterns, etc.

Software

Arduino IDE 1.8.1+
* CmdMessenger
Python 3.5.4+
* vitualenv, virtualenvwrapper-win, PyCmdMessenger, obs-ws-rc
Git

notes

evtest to check inputs from the IPAC-2 on rpi

add player 2 keys to retropi retroarch config

swap out audio receiver for car amp thing

test autio streaming with mic, cabinet audio, and stream audio

found a woofer to test with (tbd)

usb shit - polling on rpi

keep alives for obs, obs restart on power on, rpi watchdog, faulover OBS instance, switched by obswsrc cannot connect. how will this work with auto start, and how to select which instance is stealing?

impedance matching circuit

rpi watchdog

static electricity on case

Arduino COM port detection on streaming PC in python

Do we want to record and stream?

maybe physically generate a plug/unplug signal via detection to arduino and trigger this: https://zedt.eu/tech/linux/restarting-usb-subsystem-centos/

arduino triggering done by detecting various grounding or other (is there a power? must be.) for each controller, then sending that to arduino, then to pi.

Hwinfo for monitoring streaming PC? whyzit shuttin dwn.