To add extra interest for Xander, its movement is randomised further by switching between three laser diodes to perform micro random movements very quickly. Once the new coordinates are reached, we loop back to point one.” “The laser point moves from the current point to a new coordinate, following the segment that connects the two points, at a speed defined by a status variable. “A pair of coordinates (x, y) is generated randomly,” explains Enzo. The laser’s main movement trajectory is handled by mounting it on a Pan-Tilt HAT, which has vertical and horizontal servo motors. Judging by the video on the project’s Hackster tutorial page, he seems to love it. The result is the Tri-Lasers for Felines device which, when the cat’s presence is detected by a PIR motion sensor, beams a laser dot around the room for Xander to chase between randomly generated points. “We noticed that he loves to chase a laser light, so we decided to create a device to make laser games for him,” explains Enzo. Seeking a way to keep his cat entertained, Enzo Calogero came up with an ingenious Raspberry Pi–powered project. Xander the cat is a much-loved family pet, but as his owners live in a flat, he can get a little bored staying indoors when they’re out at work. For more on things you SHOULDN’T do with a laser, visit /lasersafety. WARNING! LASER EYE! Don’t look into a laser beam, and don’t point a laser beam at a somebody’s head. The MagPi’s Phil King wonders if this is a purr-fect project…
The block diagram, circuit diagram, and complete Python program listings are given for each project, including the full description of the projects.īesides wide coverage of RTL-SDR for amateur radio, the book also summarizes the installation and use instructions of the following ham radio programs and software tools you can run on your Raspberry Pi: TWCLOCK, Klog, Gpredict, FLDIGI, DIRE WOLF, xcwcp, QSSTV, LinPsk, Ham Clock, CHIRP, xastir, and CQRLOG.Keeping a modern cat entertained requires something more high-tech than a ball of yarn.
Example projects developed in the book include a station clock, waveform generation, transistor amplifier design, active filter design, Morse code exerciser, frequency counter, RF meter, and more. Some knowledge of the Python programming language is required to understand and modify the projects given in the book. Step-by-step installation of the operating system is described with many details on the commonly used Linux commands. The book is suitable for the full range of beginners through old hands at ham radio.
This book is aimed at amateur radio enthusiasts, electronic engineering students, and anyone interested in learning to use the Raspberry Pi to build electronic projects. With the addition of a low-cost upconverter device, an RTL-SDR can easily and effectively receive the HF bands. With such a simple setup it is feasible to receive signals from around 24 MHz to over 1.7 GHz. A basic system may consist of a USB based RTL-SDR device (dongle) with a suitable antenna, an RPi computer, a USB-based external audio input-output adapter, and software installed on the Pi. The RTL-SDR devices have become very popular among hams because of their very low cost (around £12) and rich features. Nowadays, anyone can purchase a £40 Raspberry Pi computer and run almost all amateur radio software on the ‘RPi’, which is slightly bigger than the size of a credit card. Издательство: Elektor International MediaĪlthough much classical HF and mobile equipment is still in use by many amateurs, the use of computers and digital techniques has now become very popular among amateur radio operators. Название: Raspberry Pi for Radio Amateurs: Program and build RPi-based ham station utilities, tools, and instruments