Most could probably even write a phone application to do the control. But do you want to ... interface that will talk to your hardware over Bluetooth LE, USB, or Ethernet (including WiFi).

[James] is one of those guys on a quest to control everything ... A cheap serial Bluetooth modem from eBay lets him connect to his phone. An Arduino board listens for data from the modem and ...

Arduino is a microcontroller used to control motors, LEDs ... Raspberry Pi computers offer more connectivity options, such as Bluetooth pairing on the Raspberry Pi 4, it's worth noting that ...