An IoT cat litter box with WiFi, using an ESP32, able to measure the weight of my cats (using weight sensors and HX711 amplifiers), monitor the general cleaning conditions of the cat litter box and even store all the data in the cloud (using the Thingspeak platform)! The device is even able to generate notifications by email, Twitter, etc.
Surely it may seem like a shitty idea (in this case, cat poo), but that can be used by the reader to learn some new skill that can be used in other projects!
Full instructions at:
White and Orange
Assembling the gadget