szczys writes: The NTSC standard has effectively been replaced by newer digital standards, but most televisions still work with these signals. This can be done through a composite video connection, but more fun is to broadcast video directly to your television’s analog tuner. This is what cnlohr has been working on, using a lowly ESP8266 module to generate and transmit the color TV signal. This board is a $3 Wi-Fi module. But the chip itself has a number of other powerful peripheral features, including I2S and DMA. This hardware makes it possible to push the TV broadcast out using hardware, taking up only about 10% of processor time. Even more impressive, cnlohr didn’t want to recompile and flash (which is a relatively slow process) during prototyping so he used a web worker to implement browser-based development through the chip’s Wi-Fi connection.
Speaking of chip-abuse in the interest of hyperlocal signal propagation, reader fulldecent writes to point out a project on GitHub that “allows transmission of radio signals from a computer that is otherwise air gapped. Right now this could be useful for playing a quick tune or for pranks. But there are more nefarious uses as this could also be used to exfiltrate information from secure networks.”
Read more of this story at Slashdot.
Original URL: http://rss.slashdot.org/~r/Slashdot/slashdot/~3/-AOJq19WuDQ/microcasting-color-tv-by-abusing-a-wi-fi-chip