A cheap and effective replacement for a GSM alarm still using the existing commercial 433Mhz wireless alarm sensors.
Project tutorial by percyplatypus
Arduino Piano using an Arduino Mega2560. 13 keys, 20x4 LCD display, and 2 buttons to reset or change songs.
Project tutorial by nlkong
Learn how to use Arduino IoT Cloud and Amazon Alexa to interact with your sensors.
Project tutorial by 4 developers
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