An Arduino powered birthday reminder device that'll wish you happy birthday for 50 years on a single CR2450 coin cell.
Project tutorial by Vishnu M Aiea
A laser-cut robot kitten that runs and learns from you.
Project showcase by Rongzhong Li (李荣仲)
Build a proximity sensor using aluminium foil and a high value resistor.
Project tutorial by Amal Mathew
In this project I made a touch sensor using a coin that works based on Arduino Capacitive Sensing Library.
That's possible and I had given it a thought before. I was thinking of driving an opto-isolator in the event and use it to drive a higher load such as an electric bell. All you need to make sure is that there'll be power (for example AC) available for the end-effector such as belll, in the event of alarm triggering and wake up.
It can be done. But there are some limitations. One, the Lithium cell can't provide sufficient current for high current loads such as motors. If we use up more current from the cell, it'll reduce the span of operation. If you can keep the current below the max discharge rate of the cell, then you can do anything at the expense operation time. For example a monochrome LCD can be easily attached with LED backlight probably.
Then everything is there. If I missed to mention something please let me know. I can help you with that :)
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