0

Teletext On A Raspberry Pi With Zero Additional Parts #piday #raspberrypi @Raspberry_Pi

NewImage

Teletext on a RasPi with zero additional parts. via hackaday

Way back in the 70s, the UK and BBC rolled out teletext – an information retrieval service that’s much closer to the ‘television screens connected to computers the size of a room’ popularized by 1960s futurists than the Internet and world wide web. For about 30 years, teletext was one of the most reliable means of information distribution until it was quietly shelved with the rollout of digital television.

Playing with dead protocols is fun, though, and since the Raspberry Pi has an analog video out, [Alistair] thought it would be fun to turn his Pi into a teletext generator and display.

This isn’t [Alistair]’s first teletext rodeo; earlier he built an add-on board for the Raspi that uses an AVR and an LM1881 video sync separator to mux the video output of a Raspi with teletext signals. The new build does away with this completely, allowing any Raspberry Pi to generate and display information from a teletext service. Right now there are two demos, a Raspi status display that shows the CPU frequency, usage, memory, and temperature. There’s also a ‘clock cracker’ with a picture of Tux that should help diagnose reception issues.

All the code is available on the project’s github, although [Alistair] hasn’t released the scripts to output teletext pages captured from broadcast signals years ago.

Read more

998Each Friday is PiDay here at Adafruit! Be sure to check out our posts, tutorials and new Raspberry Pi related products. Adafruit has the largest and best selection of Raspberry Pi accessories and all the code & tutorials to get you up and running in no time!


Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, or even use Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for MakeCode, CircuitPython, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.

Join 12,000+ makers on Adafruit’s Discord channels and be part of the community! http://adafru.it/discord

CircuitPython 2019!

Have an amazing project to share? The Electronics Show and Tell with Google Hangouts On-Air is every Wednesday at 7:30pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Follow Adafruit on Instagram for top secret new products, behinds the scenes and more https://www.instagram.com/adafruit/


Maker Business — SiFive is a startup to pay attention to. RISC-5 is here to stay.

Wearables — Swatch it up

Electronics — Code like everyone’s watching

Biohacking — Stroboscopic Visual Training

Python for Microcontrollers — CircuitPython takes flight! All aboard with datum, Bluefruit CPX, and more! #Python #Adafruit #CircuitPython #PythonHardware @circuitpython @micropython @ThePSF @Adafruit

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.com !



1 Comment

  1. To be fair, Teletext isn’t really that dead a protocol. It is true that the UK retired it when it retired analogue TV transmission, as it had introduced more modern digital text standards.

    However lots of the rest of Europe simply shifted the same services on to digital platforms (as the BBC did initially with a basic CEEFAX service on satellite). In countries like Norway, Sweden etc. you still get teletext on digital platforms, and often the text service is re-inserted on the analogue outputs of SD satellite receivers to let you use your Teletext decoder in your TV just as when you were watching analogue TV.

    This Pi application could be even cooler if you could use a DVB-T/T2 or S/S2 tuner to receive a channel which still carries digital teletext (lots of European channels on Astra 1 at 19.2 will I expect), decode and output the MPEG2 or H264 video AND insert the digitally received teletext PIDs into the analogue VBI as teletext in blanking, like some satellite receivers do.

Sorry, the comment form is closed at this time.