A water temperature sensor, battery free and airtight designed for environments of difficult access like water tanks or when cables are not desired for aesthetics like a fish tank.
It’s compose by two modules: The sensor and the hub. This 2 modules align by using neodymium magnets embedded on their cases so the wireless power transfer coils are always align. The sensor module is placed inside the water tank and its held in position by the magnets of the hub module placed outside. The sensor module is completely power by the hub using the FT1235 module and its temperature readings are sended to the hub using the same module. The hub uses a ESP8266 for wifi connectivity and push the readings to a remote server.
The philosophy behind this sensor is; place it and forget it. The prototype cases are going to be 3d printed and the PCBs are going to be maje by a professional manufacturer.