Build a great sounding FM radio with a cool display using an Arduino Nano and the SparkFun Si4703 FM tuner breakout.
Project tutorial by Patrick Müller
Learn how to control Lego motors and servos with your Arduino and build your own Android app to remote control your model.
It is a device that measures CO2 levels, inside and outside temperatures, and humidity.
Project tutorial by Anton
A realtime battery indicator for your project without extra components or using any analog I/Os.
Project showcase by Arduino World
A latch circuit allowing the Arduino to power-on by pushing a momentary button and then decide when to power-off by code.
Project tutorial by Diego Contreras Ocampo
Hei, Lars Ole. You might want to have a look at my BT project, where I "decode" commands. It could easly be extended in the way you propose: https://www.hackster.io/Notthemarsian/take-control-over-lego-power-functions-ee0bfa
Even better is to program a "State Machine", see example at the excellent Gammon Forum: http://www.gammon.com.au/serial (scroll down to section state machine).
By the way, nice tutorial, Mayoogh!
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