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Title: Theatre Acoustic Panels
Date: 2021-10-21
Category: Creations
Summary: Panels for acoustic treatment in my home theatre.
Short: 3
Acoustic treatment is one of the most overlooked aspects of home audio. There's
no point in spending money on premium speakers if the room they are playing in
has poor acoustics.
The primary purpose of acoustic panels is to reduce the reverberations caused by
sound reflecting off the smooth walls of the theatre. The path of the reflected
sound is a longer distance to your ear compared to the sound coming directly
from the speaker. This causes the reflected sound to be delayed by the time it
reaches your ear. The delayed signal interferes with itself, causing comb
filtering which distorts the signal.
Acoustic panels are placed geometrically where the sound from the speakers would
reflect off the wall to reach the listener's ears. The insulation inside the
panels absorbs energy from the soundwave which reduces its volume and
interference.
![twelve L-shaped corners of the panels stacked together leaning on a table saw in a wood shop]({static}/images/panel/panel1.jpg)
I made six frames in the wood shop of my local makerspace, Protospace. After
cutting the 1x4" pine boards to length, I made a jig so I could quickly join
them together with screws.
![a panel with insulation inside on the ground about to be wrapped with black fabric]({static}/images/panel/panel2.jpg)
I added 4" batts of Rockwool insulation into each frame after it was assembled.
I then wrapped the frame with black speaker fabric and stabled it in place while
trying to pull it taut.
I sat in my theatre while a friend slid a handheld mirror along the wall until I
could see the middle of the speaker in its reflection. This told me the centre
point of where to mount each panel because the reflected sound would take the
same path to my ear.
<span class="aside">Four in the front, two in the back</span>
![four black acoustic panels mounted on the walls in my home theatre]({static}/images/panel/panel3.jpg)

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Title: Garage Door Opener Hack
Date: 2021-12-26
Category: Creations
Summary: Hacking my garage door opener to work over Wifi.
Short: 5
In the quest to automate as much of my house as possible, I thought it would be
useful to be able to remotely control my garage door from my home automation
system. If I suspected that I forgot to close it while leaving, I could check in
my security cameras and then close it from anywhere. It's nice having this peace
of mind, even if it almost never happens.
Instead of reverse engineering the wireless protocol, cracking the encryption,
and sending my own commands, I figured it would be much easier to hack the
hardware. I cracked open a spare remote to find that it contained a basic PCB
with simple tactile switches.
![the six parts of the spare remote on my desk: metal clip, plastic buttons, battery, PCB, and two halves of the case]({static}/images/garage/garage1.jpg)
My plan was to solder an Arduino controlled relay in parallel with the button
that toggled the garage door. I would also power the remote from the 3 V pin. I
soldered four wires on to the appropriate pins.
![a closeup of the green PCB with two wires soldered to the battery terminals and two to the button pins]({static}/images/garage/garage2.jpg)
I drilled a hole in the plastic case and routed the wires through it while
reassembling the remote. It's connected to an Adafruit ESP8266 Arduino with a
relay module shield.
The Arduino joins my isolated home automation Wifi network and connects over
MQTT, a simple messaging protocol, to my automation server. When it receives a
command over MQTT it toggles the relay on for a quarter of a second and then
off, simulating a button press.
![the completed system: an arduino with a white relay and wires leading to the reassembled garage door remote]({static}/images/garage/garage3.jpg)
Update: this system has been flawless for two months now. It's worked every time
I've tried to toggle the door and has never opened by mistake.

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@ -2,7 +2,7 @@ Title: Hand of Ozymandias
Date: 2012-03-23
Category: Creations
Summary: A withered hand I welded out of scrap metal.
Short: 3
Short: hand
I was visiting my cousins in Radium, BC and decided to learn stick welding at
their shop. I wanted to create a sculpture, so with pieces of scrap metal I

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@ -2,7 +2,7 @@ Title: Remote Control Light Switch
Date: 2014-10-09
Category: Creations
Summary: A device to toggle my lights remotely.
Short: 5
Short: remote
I wanted the ability to toggle my bedroom light remotely for convenience. I
designed a circuit that allows me to control my light with any

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{% extends "base.html" %}
{% block content %}
Hi, I'm Tanner! I like home automation, <a href=d>sensors</a>, bots,
privacy, Python, Debian, coffee, and makerspaces.
Hi, I'm Tanner! I like home automation, privacy, bots,
Python, <a href=d>sensors</a>, Debian, coffee, and makerspaces.
Please sign my <a href=g>Guest Book</a>!

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