Gaggia Classic Pro 2019 Leak Repair

I have a Gaggia Classic Pro 2019 Espresso machine. It's a great espresso machine, with a capable boiler and steam wand. It's also super modifiable, with a healthy Arduino community. 

Recently however after several years, it developed quite a serious leak coming out of the group head. It was extremely easy to fix, but I found it challenging searching for these fixes on the internet, and the specific parts used to replace it. So I feel some obligation to future Gaggia fixes to archive this somewhere. Here is the leak I set out to fix.

I ended up changing two o-rings, and the group head gasket. The parts used were: 

1. 8mm OD 4mm ID silicone o-ring (steam wand)
2. 109 Silicone O-Ring (steam assembly insert)
3. Group Head Gasket
   

Making the repairs  

 

Replacing  the Gasket 

To replace the gasket, you need an Allen key, and a Philips head screwdriver. Simply turn your machine on its side when unplugged and cool, and remove the group head assembly one piece at a time. Once disassembled, you'll see the current gasket and can simply remove and insert your replacement.

 

Replacing the O-Rings 

The two o-rings are replaced in the same action. Start by removing the screws behind the water tank to lift off the top of the machine. Then you'll see two Allen bolts. Remove these two bolts. Also simply pull to remove your steam cap. Then you can lift the steam assembly straight off your machine. Replace the black o-ring with 109 Silicone O-Ring.

 

While this is remove, you can also simply pull off the alligator clip on your lower steam wand. While apart, simply replace the o-ring with 8mm OD 4mm ID silicone o-ring. NOTE: The alligator clamp goes on the outside of the wand, not through the slot.

Now my machine is working perfectly! I think the real issue was simply the o ring in the steam assembly, but it was worthwhile to disassemble and find replacement parts of the rest as well. Good luck and hope this can help some wayward GCP fixers.

 

Turning a Hot Air Popcorn Popper into a temperature controlled Coffee Roaster

I love coffee, and I love making things. So I'm surprised this project took me so long, but thankfully I've finally got around to building my own coffee roaster. All you need for a good DIY coffee roaster is a source of heat, and something to mix up the beans. After some research, I decided to start with a hot air popper. This blog post will walk through how I converted the Presto Poplite Hot Air Popper into a coffee roaster. 

How To Hack Alexa (Echo Dot) into Big Mouth Billy Bass

Alexa is fun and all, but combining her with animatronics such as the Big Mouth Billy Bass creates a much larger and weirder personality! In this post I'll walk you through how to make an Alexa device out of a Billy Bass toy. This isn't an original idea (kudos to Brian Kane for coming up with this project), but I've tried to make the steps as simple as possible.

Do It Yourself 

Tools: Soldering Iron, Hot Glue Gun, Torx Screwdriver, Philips Screwdriver

Materials:

Billy Bass in the Toronto Tool Library surgery room.

1. Big Mouth Billy Bass*
2. Echo Dot 2nd Generation
3. Arduino Uno
4. Arduino Motor Driver Shield
5. LM386 Amplifier 
6. 3.5mm Audio Cable  
7. At least 4x C Cell Batteries 

*This Billy Bass seems closest to mine, any should work but some may contain only two motors 
  

Billy Bass Tear-down 

 

Caesar's Cipher in Python (AVW ZLJYLA!)

Aol Ffily-Vtlsslaal

Growing up I was always fascinated by hidden messages, secret codes, ancient languages, and all manner of disguised communication. As I started learning math and computer science, that interest strangely faded. This was likely because modern cryptography seemed so complicated I didn't think I'd be able to make sense of it.

This all changed recently when I read a spectacular book called The Code Book. It starts with examples of secret codes (or ciphers) used in Ancient Rome, Medieval Scotland, and Victorian England. It carries on through WWI, WWII, early internet encryption, and ends with a breakdown of the expected uses of Quantum Computing.

I would love to share much more about this book, but you're better off to just read it and I'll get on  with my post. 

While reading the early chapters, I started thinking about how powerful I could have been in Medieval times if I had access to a computer and a python interpreter. Naturally I started writing some code just in case. The resulting program ended up being both fun, and pretty beginner friendly. So I have decided to write up a guide to how these work.

In this post I will start with what is called Caesar's Cipher.

Caesar's Cipher

Glass vs Reflective Film Smart Mirror Showdown

After upgrading my Smart Mirror from a reflective film mirror to a glass two way mirror, I thought it would be interesting to attempt a (semi) scientific comparison between the two types of mirror.

This test involves taking a bunch of pictures and rating the mirrors on a few categories. I decided to focus on transmission, reflection, and simplicity when evaluating each solution.

You can also checkout my album of comparison photos here to draw your own conclusions!

Laser Cut Cutlery Drawer

I recently joined Toronto's SteamLabs, and got access to a laser cutter for the first time. Laser cutters are incredible machines which use a freakin' laser to carve or etch patterns into flat materials like wood or plastic. They are fast too!

Over the past few years of 3D printing, I have learned that often some of the best uses for these amazing tools are to take something really mundane and just make it easier to make. For example, one of my most useful 3D prints was some "S" shaped hooks to hang Christmas tree ornaments. Within about 20 minutes, we had enough for all the ornaments we could hang.

Well, my laser cutting got off to a start with a similarly thrilling project. A cutlery drawer! It's pretty straightforward, but since it has proved to be so easy and useful, I decided to share it in case anyone else needs a custom drawer organizer.

Here's how it went down.

Fire From Water

This is a project I've had on the backburner for almost exactly 1 calendar year. The seed was planted when I toured the Harry Potter Studios last year and saw a fake fireplace effect being used quite extensively. I am also an avid watcher of the "Fireplace for your Home" Netflix channel, so I eventually realized I needed one of these imitation fires of my own. So here we are now!

Take a look at what I put together, and if that curiosity is still burning keep reading for instructions to reproduce this project yourself.

Haunted Home Automation

Halloween is one of my favourite holidays of the year. One reason for this is that it's totally optional and low stress. People can get exactly as in to it as they want. I'm also really intrigued by the perseverance of belief that there are supernatural forces at work. No matter how fact based and rational you are, I'd wager you still get a tingling feeling on the back of your neck crossing a cemetery during a wind storm all alone at night.

In other words, even if you don't believe in ghosts, you still end up scared of them anyway. The goofy costumes and haunted houses are just icing on the cake.

My absolutely favourite part of Halloween however is that DIY is deeply ingrained in the traditions. There's pumpkin carving, costume making, haunted houses in a garage, and a lot more.

Naturally as a DIY fan, I've been thinking of how to incorporate technology into a good scare. Home automation has a lot of potential here, and it pairs nicely with the smart mirror in our house. Check out the video below to see what I came up with (with some help)!

Do it Yourself

If you like this effect and want to do it yourself, a good starting point is a smart mirror with Alexa and a custom skill to run scripts. You'll also need some Philips Hue lights.