As mentionned on the board, here is my new "6x electrodes liquid level gauging" inside a reservoir. This circuit is based first on the ability of common water to be electroconductive but it works also with any electrolyt, also based on very well electrically protected ultra-high impedence brass electrodes. I cannot say more. The board can adapt itself to three different water reservoirs with dual HIGH and LOW electrodes, or a mono water reservoir with six electrodes which detect different liquid levels. The circuit has been designed so that none of the electrodes will experiment corrosion, even if every one year, the electrodes shall be cleaned if in case of limestone presence in the water. There are an ESP32 for a WiFi connectivity, a Moxa Miineport E1 for COM over LAN serial link and a PIC18F46K22 for a smart six channels electrodes debouncing. Both the ESP32 and the PIC can discuss together via 3V3 standard UART. Sorry for both 1 [A] DC fuses which don't have the best 3D model. The board has 6 copper layers. The board can be supplied or with the Fixmebus or via the USB-C connector, thanks to the dual ideal diode oring LTC4413. The Fixmebus is a 24 [VDC] powered half-duplex RS485 home made field bus using the four pairs of ethernet cables: one for data and three for power ; it can be dispached around an area in a daisy-chair and/or in a star way.
