Transmitting Data with a Raspberry Pi and RTL-SDR
Hackaday brings to attention a simple hack where hacker Marc uses an antenna connected to a general purpose I/O (GPIO) pin on his Raspberry Pi to wirelessly transmit a wav file via AFSK modulation to his RTL-SDR. He uses a program called minimodem to encode the wav on the Raspberry Pi and then on the PC to decode the data received by the RTL-SDR.
Using this method, it is claimed that a signal can be transmitted up to 50m away, even through walls.
The website in question already appears to be down but:
– The video is available here: https://vimeo.com/79080616
– Copy of the website has been archived: http://web.archive.org/web/20140401042707/https://www.kprod.eu/blog/?p=26