i am looking to build a device that can communicate with a phone and through that phone you could turn on or off a light or a siren with fairly long range 20 to 30 meters (60 to 90 feet). Would anyone be able to help regarding this device. I am looking for it be as small as possible. also i wanted this device to run with fairly low voltage dc power source.
please help with this
Latest Kickstarter Hey Everyone, It’s been a year since I last launched a project on Kickstarter. Now that the dust has settl…