[Heath Paddock] wanted to confound his friends with a game that mimics an escape room in a box. About six months after starting, he had this glorious thing completed. It’s a hardware version of a game called Keep Talking and Nobody Explodes where players have five minutes to defuse a suitcase bomb. This implementation requires at least two players, one with the box-bomb itself, and one who holds all the knowledge but can’t see the box-bomb to defuse it.
There are plenty of hobbies around with huge price tags, and ham radio can certainly be one of them. Experienced hams might have radios that cost thousands of dollars, with huge, steerable antennas on masts that can be similarly priced. But there’s also a side to the hobby that throws all of this out of the window in favor of the simplest, lowest-cost radios and antennas that still can get the job done. Software-defined radio (SDR) turned this practice up to 11 as well, and this radio module uses almost nothing more than a microcontroller to get on the air.
The design uses the capabilities of the Raspberry Pi Pico to handle almost all of the radio’s capabilities. The RF oscillator is driven by one of the Pico’s programmable I/O (PIO) pins, which takes some load off of the processor. For AM and SSB, where amplitude needs to be controlled as well, a PWM signal is generated on another PIO which is then mixed with the RF oscillator using an analog multiplexer. The design also includes a microphone with a preamplifier which can be fed into a third PIO; alternatively it can receive audio from a computer via the USB interface. More processor resources are needed when generating phase-modulated signals like RF, but the Pico is still quite capable of doing all of these tasks without jitter larger than a clock cycle.
The purpose of this wiki is to preserve and present information about the development and use of Linux in embedded systems as well as open source projects and tools for general embedded development. To use this wiki, click on one of the portal links below. This site has slides, and links to videos, for many years of the Embedded Linux Conference and Japan Jamboree!
TINKERplate is the first Pi-Plate that is fully compatible with the Raspberry Pi HAT standard. With this design, we have borrowed features from our other products and squeezed them down onto this tiny form factor. And like all Pi-Plates, you can increase the number of available I/O ports by stacking up to eight TINKERplates.
On 10/10/2023, Debian Bookworm was released for the Raspberry Pi. This OS has a number of new features that improve the GUI as well as some behind the scenes improvements. One change however, is going to be a little painful for users of Python. Specifically, any code that uses a library added via the pip utility has to be executed inside a virtual environment. While the reasons for doing this are valid (see PEP 668 for more details), the solution is somewhat draconian. Perhaps a more elegant solution will arrive in a later release of the OS, but until then, you can choose to either hold off upgrading to Bookworm (and stay with Bullseye) or to do the following:
In this video, we talk about the purpose of drivers and why they are necessary when working on embedded systems. Later, we go over how to install the Raspberry Pi kernel headers and use them to write a kernel driver for the device. Finally, we install the kernel driver and prove that it is running
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