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2020-11-08

RefloWaffle: A dirt cheap reflow oven - the Belgian way

"For her a Moulinex, for him delicious meals"

Though I don't do many PCBs, I guess every hacker must have a reflow oven. So this is a project I've been pursuing on and off for nearly 4 years:
A small, portable, and dirt cheap (less than $25) reflow oven.

After a few tests with a traditional electric oven recovered from the trash, I concluded its thermal inertia was so high it would require massive modifications to achieve anything close to a decent reflow profile, and as I didn't feel like spending much money on a large oven, I looked for a better way.

And I think I found it. Read on for more...

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2017-08-09

Turning a Quick Charge 3.0 charger into a variable voltage power supply

Disclaimer: the following refers to some cheap USB chargers which may not comply with local safety regulations and could pose a hazard. All you do is at your own risk and I cannot be held responsible for use or abuse of those chargers.

1. Introduction

A few months ago, I stumbled upon a Hackaday post presenting the QC2Control library by Timo Engelgeer (Septillion), which makes it very easy to turn a Qualcomm Quick Charge 2.0 compatible USB charger into a 9V or 12V power supply. I used that trick successfully to power a small project that required both 5V and 12V, and its simplicity made me want to dig a bit further into Qualcomm's Quick Charge technology.

As you may know, Quick Charge 3.0 adds the possibility to request any voltage between 3.6V and 12V (with 0.2V steps), and with some QC3 chargers available for less than 4 EUR, throwing in an Arduino clone and a few resistors make a very affordable way to power devices with custom voltages. Of course, for that price, don't expect top notch precision, protection, or power, but it is more than enough for most DIY projects, and the adjustable voltage can compensate voltage loss in long power lines (think wired sensors far from alarm system for example).

So I decided to try and see if QC3 could be controlled similarly to QC2. (Spoiler: it is the case, but required a few adjustments.)

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2017-06-05

Introducing the WAHOOcorder



Front panel

tl;dr

What ?

  • A set-top box modified to add Wi-Fi

What's special about it ?

  • Bidirectional interactivity from a browser
  • Advanced features such as user-firendly search interface
  • Bidirectional integration with existing operator website
  • 5 EUR (5 USD) modification

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2017-02-25

CH923/CH925/CH926/CH928/ JY923/JY925/JY926/JY928 coin acceptor: Features and caveats

I just finished testing this coin acceptor and I thought I'd write about it because it can be tricky and many sample codes I found on the net can lead to errors in coin identification.

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2016-12-19

A Dirt Cheap F*** Awesome Interactive Led Table



Space invaders

tl;dr

What ?

  • led coffee table
  • touch-sensitive

What's special about it ?

  • IR detection through tranclucent acrylic
  • 3 devices connected to a Raspberry Pi via a single serial port
  • Java program hacked without modifying the actual code
  • 130 EUR (140 USD)

Continue reading...

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