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Chemistry Stirrer
Basic LEGO chemistry stirrer, work in progress
Experiments on NFC with a simple home-build circuit: My phone's 13.56 MHz field delivers energy to a ST25 chip via a hand-wound coil, powering it up, receiving a simple command via NFC, subsequently waking up a Pico microcontroller that executes the command. In this case, slow or fast flashing of a LED.
This work was given an honourable mention in the "Least Power" cat...
Tinta receives a custom message type in the phone App from a tap over NFC. The message appears on the e-paper display.
Written on the phone and carried by the NFC field. Tinta was switched off before the tap and switches itself off again afterwards — e-paper keeps the text on screen with no power at all.