ESP32 Automated Irrigation Control System Project - PART 2 - Water Meter Implementation

Were back in part two of the series continuing with the creation of a library that further supports hardware for the project and publishing it. This time it will be the water meter which uses a combination reed switch and magnet to generate a pulse for measurement.


Understanding how this works means that I don't actually need the meter but can produce my own meter emulator to make this project easier. In its simplest form, a contact with two wires should get me out the gates.


I start off with my usual library creation with a getVersion, but in addition to it, an interrupt that checks to see if the switch was closed and notifies accordingly. Dirty but effective for testing. With this working I can expand upon the arguments with more parameters to provide more context as to what it means when the switch closes as well as some functions that provide some basic readouts.


Now with a readout of both gallons and liters, touching the wires shows the increment as specified in the object creation. This number is stored in memory but now we need the final feature and that s the ability to store the information to a file. For this spiffs will be employed.


With spifffs a new function to initialize the file system is created, this is complimented with services to update that file for each event to align the mechanical value on the meter with that in the file itself. Final testing of this is done by pulling power.


To test this all out a small project board is used with a DC motor and a few batteries along with a POT to generate this signal on a reed switch with a magnet to emulate the meter for software testing.

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