Three seashells as an Arduino based timer to measure the 20 seconds, which is recommended if you want to erase all traces of viruses.
Project tutorial by remnis
Making my own special gift for a 50th anniversary with NeoPixel and an Arduino Nano.
Project showcase by remnis
How to connect a fingerprint sensor to an Arduino or NodeMCU, then store and read fingerprints.
A Home Automation system using a Raspberry Pi 2 and Windows 10 IoT Core including an App.
Project tutorial by Christian Kratky
Interesting. But it might also be the reflective properties of the empty bottle vs. the full bottle.
The SparkFun library doesn't want to be compiled with the ESP. You are right, a additional controller does increase the costs, but with a cheep China clone it's only about 3.50 € more. A second NodeMcu would be cheaper, but wouldn't look so cool ;-).
I will publish the code for the Nano this weekend. Although it's not very spectacular.
Well, install the Adafruit_VL53L0X library for this sensor. It comes with an example, that has all you need to get this sensor working.
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