The HC-05, a Bluetooth to serial bridge, can be found for around $5 on the internet and therefore may be the cheapest way to add Bluetooth connectivity to your project. However, its default settings ...

The Arduino Uno Q is a powerful single-board computer, packing a Qualcomm QRB2210 alongside an STM32. The board itself runs Debian, and while you can use the Arduino App Lab to build and deploy ...