Man wants Raspberry Pi as drone detector -

A US engineer is trying to sell the idea of an open source drone detection system built out of shedloads of Raspberry Pi kits.

The Drone Shield, which is designed by John Franklin, will cost around $60 to $70 to set up. It will combine a, a signal processor, a microphone, and analysis software to scan for specific audio signatures and compare them against what known drones sound like.

Once a match is found, the Drone Shield then sends an e-mail or SMS to its owner and warns him or her to keep their head down.

Franklin wants to raise funds from other "privacy-minded citizens" like himself. He wants  to counter the rising use of drones not only in foreign theatres of war, but also in domestic skies, something which has not really happened just yet.

He told Ars Technica that it probably would take "about $100 and two months" to figure out if the idea would work. Already there are a few anti-drone tactics and devices which you can buy off the shelf already.

Franklin acknowledged that the device won't be 100 percent perfect. It will be based on some 1997 research paper from the Army Research Laboratory entitled: "Acoustic Feature Extraction for a Neural Network Classifier". But because the gear is open source, he is hopeful that the buyers will improve it.

Linda Lye, an attorney with the American Civil Liberties Union of Northern California said that this project is yet another indicator of the fact that there is very strong and widespread sentiment on the ground about drones, and it's one of tremendous scepticism.