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.
How to drive a seven segment display using only four pins.
Build your Nixie Tubes display easy.
Project tutorial by Team GRA_AND_AFCH
It is a device that measures CO2 levels, inside and outside temperatures, and humidity.
Project tutorial by Anton
Great to hear that you had fun with your project and mastered it! I think that one learns much more from a difficult project even if it never works perfectly in the end. Thanks for the comments.
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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