Idea: A TENS Machine you can control with your phone http://hackaday.com/2015/03/02/building-a-transcutaneous-electrical-nerve-stimulation-device-in-a-weekend

Idea: A TENS Machine you can control with your phone http://hackaday.com/2015/03/02/building-a-transcutaneous-electrical-nerve-stimulation-device-in-a-weekend/ http://hackaday.com/2015/03/02/building-a-transcutaneous-ele... TENS are currently kind of expensive and hard to use. People typically only use them when prescribed by a doctor and the devices are actually quite useful. Many people get pain somehow or could use some sort of recreational relaxation, and a intuitive TENS machine for a smart phone could have a good market.