If the car and phone are paired via Bluetooth, the doors unlock. Walk out of range and the car automatically locks when the connection drops. His build uses an Arduino Mega with a BlueSMiRF ...

Connecting the Intel® Edison board to your Android* Phone with Serial Port Profile (SPP) describes how to connect ... Arduino code. In Connecting to Intel® Edison from Android* with Bluetooth ...

[Labpacks] wanted to build a robot car controlled by his phone. As a Hackaday reader ... no need for an external Internet connection. The system supports Arduino and ESP controllers.

If you're having persistent Bluetooth connection problems, try resetting your devices, or having your phone or tablet "forget" the connection. Visit Business Insider's homepage for more stories.