These days, 433-MHz RF transmitter/receiver modules are very popular with electronics hobbyists and tinkerers. These cheap short-range radio modules can be used with almost all microcontrollers for a ...

Another exciting application is environmental monitoring. By using the Adafruit MQTT Arduino Library, you can set up a network of sensors to collect data on temperature, humidity, and air quality.

The Adafruit Gemma measures just 1 inch in size and is powered by an ATtiny85 and programmable with an Arduino IDE over USB, allowing you to create those wearable projects of the future.