Arduino micro with RFID unlock your computer. Set one or many RFID tag, and unlock your computer with your personal password.
by Giovanni Gentile
Using the Arduino Cloud API to obtain IoT data for your MIT App Inventor apps.
by Harry Anderson
If you want use two Arduino, you can use a simple I/O port to communicate. The point of question is the Ground.
My first project running on a lithium ion battery is here: an IOT device that not only detects if there is water but sends data to the cloud
by Science 3D
This device allows me to detect if the spool ran out of filament or if the print head is clogged !!
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