Know How... (Video)

Let's Get Jiggy with some Printer Tips!

1. Adjusting the bed (multiple times using a spacing card.)
2. FIXING the bed (possibly needs to be done on Patrick's printer)
3. Hairspray
4. Alcohol cleaning

The Micro Swiss MK10 All-Metal Hotend Conversion Kit

• The factory hot-end is actually PLASTIC lined -- This means you get much less stable temps
• With a metal hot end, you get more consistent melt
• You can extrude faster (you're not losing as much of the heat)
• You don't get filament "retraction" which can really mess up layers
  • Uses a "Thermal Barrier" -- By using two different metals (stainless steel and aluminum) you can keep heat in the lower portion, and conduct heat away in the upper portion.

Andy Say
- 3D Printer Thoughts
"I am sure there have many discussions about 3D printers here. But I am tossing between two printers and looking to get some input from the group.

The first printer is the LulzBot Mini 3D Printer. My local Microcenter has them in stock at $1,199. The second printer is the Monoprice Maker Ultimate 3D printer for $699 (of course kicking myself as I missed when it was on sale about a month ago for $549, and none of their codes work for 3D printers!).

Anyway, for the price difference, is there really a much of a difference?"

The LulzBot Mini

• Heated Borosilicate Glass Bed
• 152 x 152 x 158
• 275mm/sec (at 0.18 height)
• ABS, PLA, HIPS, PVA, Wood, Polyester, PETT, bronze & copper, Polycarb, Nylon, PETG, conductive PLA/ABS, UV, PCTPE
• 1 Yr Warranty

Monoprice Maker Ultimate

• Heated Bed (Metal with build tape)
• 200 x 200 x 175
• 150mm/sec
• Same layout of filaments
• 1 Yr Warranty

Hosts: Fr. Robert Ballecer, SJ and Patrick Delahanty

Connect with us!

• Don't forget to check out our large library of projects at https://twit.tv/shows/know-how.
• Join our Google+ Community.
• Tweet at us at @PadreSJ, @PDelahanty, @TWiT_Raccoon, and @Anelf3.

Thanks to CacheFly for the bandwidth for this show.

Security on the Cheap
- Hector Sotomayor
"I need a security solution. What I'm looking for is this: when someone steps on our porch, some motion sensors will detect them and send me a notification on my phone. Also... it sets off strobe lights to alert anyone passing by and to potentially warn the thief that we know he's on the premise."

Let's break down the requirements

1. A sensor to detect motion on a porch
2. A phone notification when motion is detected
3. A strobe that triggers when motion is detected

We're going to use "Cayenne" by myDevices

Parts:

1. RasPi (Any Version)
2. 5V Power Supply
3. Relay
4. Motion Detector

Solution Logic Overview:

1. The motion sensor is triggered. In turn, it triggers a pin on the RasPi
2. The RasPi triggers the relay to turn on the electrical load (Strobe)
3. The RasPi reports the trigger event to myDevices
4. myDevices sends a text message to the phone

RasPi 2b Pinout
https://blog.adafruit.com/wp-content/uploads/2015/06/raspberry.jpg

PIR Motion Sensor Schematic
https://www.bing.com/images/search?view=detailV2&ccid=rj1DSM1S&id=FB5322678354FD3C4DC006C4DAC479CCF6996D51&thid=OIP.rj1DSM1SPe1uM-wDAUtusAEsDT&q=pir+motion+sensor+schematic&simid=607997590805679233&selectedIndex=52&ajaxhist=0

Tutorial:

1. Navigate to "https://mydevices.com"
2. Create a new account (or login to your existing account)
3. Select "Add New" (If the account has been accessed previously)
4. Select "Raspberry Pi"
5. Open RasPi terminal
6. Copy and past the two commands from "Option 2" into the terminal window

• Once the scripts have finished, "myDevices" is running on that RasPi (This could take up to 20 min)
• After a reboot, the RasPi will show up in your myDevices Desktop (You need to refresh the browser)

Hosts: Fr. Robert Ballecer, SJ and Patrick Delahanty

Connect with us!

• Don't forget to check out our large library of projects at https://twit.tv/shows/know-how.
• Join our Google+ Community.
• Tweet at us at @PadreSJ, @PDelahanty, and @Anelf3.

Thanks to CacheFly for the bandwidth for this show.

iOS 11
- Maria Joseph Laienz Sumpaico
"Know How professionals. I've been watching a long time, even though I don't always understand what you're doing! lol. I know you do a lot of your projects with Windows, Android, and Linux, but I'm a lowly iOS user. I've been hearing that iOS 11 is great and that it will open new functionality to users like me. What's your take and are there any secrets that you can tell me?"

All Megan! All the Secrets!

Turn on Do Not Disturb While Driving to Save Your Life: Automatically (detects driving movements), Bluetooth (when connected to your car stereo) Manually (don't do this because the front part of your brain will take over and you will text and drive.
- you could turn this off, but you have to LIE TO YOUR IPHONE

Add a record screen button to your Control Center

Settings — General — Storage - to review and delete iMessage attachments and offload unused apps

PSA: Control Center icons for WiFi and Bluetooth don't actually turn off WiFi and Bluetooth. You disconnect from the accessories that you're connected to, but you can still use your Apple Pencil and your Apple Watch and AirPlay and AirDrop

Hide your notification text. Whether you do a video podcast with your iPhone or iPad or not, sometimes you do not want the world to see the contents of your notification. Now you can hide the text.

Time Sync
- Tom Krauska
"Padre - I am watching your recent appearance on Security Now and Steve is talking about his audio problems.

What got my attention was that he was also doing an audio recording that for some reason wouldn't sync with the video.

I'm recording a one-woman show video and want to record a separate audio on my Zoom H1, but don't want to have issues syncing.

Can you give me any advice?"

Bad-Ass Quadcopter!
- Ken Jancef
"My first racing quad build was a 'Robocat 270', back in April 2016. I liked it at the time, but the front canopy cracked a few times, and wiring prevented me from putting the side covers on, so I didn't use it much.

This past May I decided to get a ZMR250 and PDB and transplant the parts over to it from the Robocat. Finally got the time to do it, took me a few weeks, between trimming/soldering wires and faulty voltages on the PDB. Just did a 30-second hover in the basement and I still have all my fingers, so it's a success!!

The Robocat is the yellow one, the ZMR250 is green..."

Hosts: Fr. Robert Ballecer, SJ and Megan Morrone

Connect with us!

• Don't forget to check out our large library of projects at https://twit.tv/shows/know-how.
• Join our Google+ Community.
• Tweet at us at @PadreSJ and @Anelf3.

Thanks to CacheFly for the bandwidth for this show.

Sponsor:

Amazon Alexa Flash Briefings

• Flash Briefings are for quick news and content delivery via Amazon's Alexa devices.
• Can do two different types of Flash Briefings: Text and Audio

Steps to set up Flash Briefing:

1. Sign up for Amazon developer account at https://developer.amazon.com/
2. Under "Alexa", go to "Alexa Skills Kit" and click "Get Started".
3. This lists your current skills. You probably have none, so click "Add a New Skill".
4. Select "Flash Briefing Skill API", language, and enter a name for your skill.
5. Under "Configuration", enter your error message in case it doesn't work.
6. You also add your RSS or JSON feed URL here, but we'll come back to that later when we have one.
7. Under "Test", set it to "Yes" while you're testing. You'll be able to load up the skill on your Alexa, but others can't.
8. Under "Publishing Information", select a category and sub-category.
9. Testing instructions, you can just enter something like, "This is a Flash Briefing that will ____." There are no real testing instructions necessary for Flash Briefings.
10. Can select countries/regions the skill should be available.
11. Enter (public) skill descriptions, keywords, and upload 108x108 and 512x512 icons.
12. In "Privacy & Compliance", check the options (likely "No") and optionally link to privacy and terms of use pages.

Can test Alexa skills without an Echo by going to https://echosim.io

Flash Briefing feeds must:

1. be served via HTTPS
2. be in JSON or RSS format
3. be UTF-8 encoded
4. include 1 to 5 unique items. (If you include more, only the first five are used...newest to oldest.)
5. be able to handle at least 1 request per minute with a latency of under 1 second.

Text-To-Speech Flash Briefings

• Items limited to 4,500 characters.
• Must be plain text with no special characters, SSML, HTML, or XML.
• Should be properly punctuated. Commas and semicolons result in short pauses. Periods, question marks, and exclamation points result in longer pauses.

Audio Flash Briefings

• Require HTTPS URL to audio content.
• 256kbps mono or stereo MP3
• Under 10 minutes

Hosts: Fr. Robert Ballecer, SJ and Patrick Delahanty

Connect with us!

• Don't forget to check out our large library of projects at https://twit.tv/shows/know-how.
• Join our Google+ Community.
• Tweet at us at @PadreSJ, @PDelahanty, and @4theburke.

Thanks to CacheFly for the bandwidth for this show.

Sponsors:

Protecting your credit and smart finances.

Hosts: Fr. Robert Ballecer, SJ, Megan Morrone, and Jason Howell

For full show notes, visit https://twit.tv/shows/know-how/episodes/344

Sponsor:

Padre and Patrick answer your questions!

Hosts: Fr. Robert Ballecer, SJ and Patrick Delahanty

For full show notes, visit https://twit.tv/shows/know-how/episodes/343

Sponsors:

Triggered!
Last week we showed how you could build and program a simple Arduino-powered IR code reader and use it to trigger certain events when the proper code was received.

Demo 1

1. Show IR code being received
2. Show Case Statement that triggers an event when IR code is received
3. Show LEDs being triggered when the IR code is received

But we only triggered 5volt LEDs... what if we wanted to trigger something BIGGER?

Relays!

• A relay is a switch that is toggled electrically
  • It gives us the ability to turn on and off a circuit with a different circuit
    • So a 120AC circuit could toggle a 12V DC circuit
    • A 5V circuit could toggle a 24V circuit

There are several different TYPES of Relays

• Electromagnetic (the most popular)
• Optomechanical (Much like EM, but the circuits are COMPLETELY isolated from each other)
• Solid State (No moving parts. All switching is done in a semiconductor)

We're going to be using electromagnetic Relays

• In the most basic version: a switch is toggled between "on" and "off" by an electromagnetic that physically moves the switch between the two positions

8-Relay Package

https://www.amazon.com/gp/product/B01NBUDHPB/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1​

The important part is that we can use a 5-volt circuit to toggle a circuit up to 30v (or 120v AC)

IR0_Relays

Demo 2:

• Single Relay that is toggled by ASCII case statements

IR1_Relays

Demo 3:

• 8-Relay Board that is toggled by ASCII case statements

Now we know that we can trigger the relays with the keyboard... next up we're going to add an IR receiver and trigger them with an IR remote control.

IR2_IR_Triggered_Relays

Demo 4:

• 8-Relay Board that is toggled by IR code case statements

All Code for this episode is found at:
https://www.dropbox.com/s/20xonebuc7eh7is/KH342_IR2.zip?dl=0

Hosts: Fr. Robert Ballecer, SJ and Megan Morrone

Connect with us!

• Don't forget to check out our large library of projects at https://twit.tv/shows/know-how.
• Join our Google+ Community.
• Tweet at us at @PadreSJ and @Anelf3.

Thanks to CacheFly for the bandwidth for this show.

Sponsor:

Basics of IR Control

IR control is a BINARY communications system

• It uses a series of "0" and "1" (off or on) to convey a value from a transmitter to a receiver
• The "Transmitter" is an IR LED and the "Receiver is a photosensitive element that responds to IR light"
• However... just being able to "see" if the IR LED is lit doesn't allow us to communicate.
• We need to have a "protocol" that defines how long a "control sequence" is and how to read it.- In other words, I need to know when the sequence starts, and when it ends.

We're going to use the "IRremote" library which understands most of the POPULAR protocols

Demo of Reading IR Codes

1. Show Interface
2. Show codes
3. Show Hardware

Let's Assemble the hardware!

Parts

1. IR Receiver (AX-1838HS) and LED
2. Arduino Nano

Pinout of the IR Receiver

From left to right, looking at the front of the sensor

1. Out
2. GND
3. VCC

Let's Program!

• First, we need to include the "IRremote" Library
• Sketch > Include Library > Manage Libraries

Hosts: Fr. Robert Ballecer, SJ and Megan Morrone

Connect with us!

• Don't forget to check out our large library of projects at https://twit.tv/shows/know-how.
• Join our Google+ Community.
• Tweet at us at @PadreSJ and @Anelf3.

Thanks to CacheFly for the bandwidth for this show.

Protecting myself on a college network

"What is the best way to protect yourself at college on a college network? I am going to have a NAS, set up there too and what is the best way to protect as much as possible? Unfortunately, my college does not allow routers, so that is out." - David Bruns

Basic Information:

• He says they check the rooms (that's how they know if he has a router)

Why are they doing this?

1. They need to control the devices on their network
2. They need to NOT have rogue Wi-Fi APs that congest the airwaves
3. They need to know WHO has done something unauthorized on their network

HOW are they doing this?

1. Scanning for Wi-Fi APs (even hidden ones) - Possibly running deauth attacks on any non-auth AP
2. Most likely, they're also looking at MAC addresses to see if he's using a device registered from a router manufacturer.
3. Traffic inspection: If a single IP (through a NAT) has more active connections than can be expected from a single device, they can escalate your connection to an "inspect the room" search

So... we have two challenges:

1. Don't let them DETECT that you're using a router.
2. Don't let them SEE that you're using a router

Basic Precautions:

1. Turn off the Wi-Fi (Sorry... I know it's inconvenient, but it's a dead giveaway
2. Close ALL ports (Don't let them enumerate your router... otherwise you TELL them you have a router)
3. No external access of your NAS (this is a dead giveaway)
4. Limit multi-device throughput

Advanced Precautions:

• Cloning your MAC address​

Jason Howell and the Amazing (kinda) Asus Zenphone AR

• Specs: 5.7" WQHD SAMOLED display
• Snapdragon 821
• 8GB RAM, 128GB ROM
• ASUS TriCam System w/ 23MP f2.0 camera, Motion tracking camera w/ fish eye lens, depth sensing camera w/ IR
• 3300mAh battery
• Android 7.0 Nougat
• First device with Tango and Daydream

Hosts: Fr. Robert Ballecer, SJ and Jason Howell

Connect with us!

• Don't forget to check out our large library of projects at https://twit.tv/shows/know-how.
• Join our Google+ Community.
• Tweet at us at @PadreSJ and @Anelf3.

Thanks to CacheFly for the bandwidth for this show.

On today's episode, is this Acer all-in-one the perfect desktop for your dorm room? A robot to fold your clothes and Padre explores his inner space.

Acer U27-880-UR11: All-in-one, LIQUID COOLED, desktop

Specs

• 7th Gen Intel i7-7500U (2.7/3.5 Quad Core)
• 16GB of DDR4 System Memory (2 slots, expandable to 32GB)
• Integrated Intel Graphics (620)
• 27" (1920 x 1080) Widescreen (LED Back-Lit) Multitouch screen
• 256GB SSD
• 1TB 5400 RPM Hard Drive
• Dual 2W Speakers with 6W Subwoofer
• Ports - 3 x USB 3.0
  • 1 x USB 2.0
  • 1 x Thunderbolt 3
  • 1 x HDMI Out
  • 1 x HDMI IN (Yah!)
  • Gigabit Ethernet
  • Combo Audio
  • Media Card Reader
• Wireless Keyboard and Mouse
• 802.11a/b/g/n/ac

Performance

• PCMark 8 - 3410
• 3DMark 8 (Fire Strike) 975
  • Performance is MOST DEFINITELY dragged down by the lack of a discrete graphics part

Pricing: $1500 MSRP

Eachine OTG Receiver

https://www.banggood.com/Eachine-ROTG01-UVC-OTG-5_8G-150CH-Full-Channel-FPV-Receiver-For-Android-Mobile-Phone-Smartphone-p-1147692.html?rmmds=myorder

• Allow me to interface a receiver with my PROPERLY Equipped Android phone or tablet
• 5.8 Ghz (so it won't crowd the already crowded 2.4Ghz spectrum
• THIS WON'T WORK ON ALL DEVICES!

1. Must support OTG (On The Go)
2. Must support UVC (USB Video Class)

Eachine TX01 NTSC Super Mini Transmitter + Camera

https://www.banggood.com/Eachine-TX526-5_8G-40CH-25MW200MW600MW-Switchable-AV-Wireless-FPV-Transmitter-RP-SMA-Female-p-1083642.html?rmmds=myorder

• 5.8Ghz
• 25mw
• Combines a camera with a transmitter/antenna
• Can run on 3.3-5v (Can be run on a single LiPo)

Android OTG UVC Endoscope

https://www.amazon.com/Endoscope-CiBest-Waterproof-Borescope-Inspection/dp/B015F53LUK

• 640x480 30fps

Hosts: Fr. Robert Ballecer, SJ and Patrick Delahanty

Connect with us!

• Don't forget to check out our large library of projects at https://twit.tv/shows/know-how.
• Join our Google+ Community.
• Tweet at us at @PadreSJ, @PDelahanty, and @Anelf3.

Thanks to CacheFly for the bandwidth for this show.