This is the next article in the series about our "Flower Machine".
For a fully automatic process, the "raw materials" must also be fed into the machine completely automatically. For the Flower Machine, this means feeding small paper squares one at a time. The obvious storage format is a stack of paper - but how do you pick a single piece of paper from a stack?
Feeding paper reliably was probably the hardest challenge in the Flower Machine project. In this post, I will present all the details it took to get the paper-feeding mechanism working.
This is the next article in the series about our "Flower Machine".
Just a quick one: Let's talk about some of the mechanical design elements in the Flower Machine project.
This is the next article in the series about our "Flower Machine".
Back in the first post about the flower machine, we talked about what it is doing. It is time to introduce how it actually works. There are already some posts about very specific topics like pneumatics or the logic controller. Before writing more posts like these, I think it is a good idea to look at the bigger picture.
Something not (quite) Flower Machine related for once. I got myself a WAGO 750 remote I/O station with a 750-303 PROFIBUS coupler. This post is documentation how I got it working with the open-source PROFIBUS-DP stack pyprofibus.
This is the next article in the series about our "Flower Machine".
Of course a machine like this would be useless without any brain to control it. The industrial solution is called a PLC (Programmable Logic Controller). However a real PLC has a number of deal-breakers for us: It is expensive, full of proprietary software, and 99% of the time programming it is windows-only.
Thus I set out to build an alternative: Meet the Poppy Logic Controller - a custom PLC-like device which mimics the real thing, but on a budget.
In this post, I will go over the hardware side. A future post about the software/firmware will follow. You can also find all hardware design files and firmware sources on GitHub: https://github.com/Rahix/Poppy-Logic-Controller
This is the next article in the series about our "Flower Machine".
Pneumatics means using compressed air to perform mechanical work. Our Flower Machine actually works using pneumatics only! But why would you choose pneumatics? And what components are needed? In this blog post, we will give an overview of pneumatics and their relationship with automating manufacturing.
Hey, I am back! Well, we are back. That's because this post is written not only by me but also by my lovely girlfriend Lena.
We've been busy with a shared project over the last months. It started back in December when we both really wanted to dive into the topic of pneumatics. We searched for a small project we could build. Well, in the end we didn't manage to keep it small. In this and following blog posts, we will present where this lead us...
I have recently(!) released port-expander, a small crate to make
access to I²C port-expanders as easy as possible.
I often open pavucontrol to adjust the volumes of different applications relative to each other.
Sometimes music is too loud, sometimes Jitsi sessions are too silent. However, it is annoying to
switch context ever so often just to open the mixer, change volume, close again. As I am always
looking to challenge myself with some useful projects reaching beyond just writing software, this
felt like a great opportunity: I built myself a small mixing desk to control PulseAudio streams with
hardware faders.
Pavu Mixer is what this resulted in. The project is fully free and open-source, including the hardware. It can all be found on GitHub: https://github.com/rahix/pavu-mixer
In this blog entry, I'm going to detail parts of the journey and the architecture of the project.
ravedude is a tool I created to seamlessly run Rust code on AVR
microcontrollers with nothing more than the usual cargo run. This is very
much inspired by the great cargo-embed tool!
Many people who have written C code for Arduino have at least heard of the
millis() function at some point. It returns the number of
milliseconds since the program started running.
In avr-hal (a Rust library for AVR microcontrollers) there currently is no equivalent for it. Instead of waiting on someone to add that, let's see what it takes to build our own!
This is a blog post accompanying the release of shared-bus. shared-bus is a small crate to allow
sharing a bus between multiple devices. The current implementation is limited to i2c but extension
to other bus protocols is easily possible.
The following post is a short description of an algorithm to generate a semirealistic city road network:
In modern HTML you can embed SVGs directly into your DOM. This allows for pretty visuals, using the powers of both css and svg. One use that I have had on multiple occasions is path animations.
This is an old post of mine about procedurally generating spaceships: