michaelcastiau / ro-water-counter

Reverse Osmoses water flow counter with smart functionality

RO Water Counter

This repository contains the source code and hardware schematics for a Reverse Osmosis water counter device, based on an ESP32 module. The device allows for setting an amount of needed liters of water an will swich on/off the RO system automatically. When the amount of liters needed has been reached, the ESP32 module is programmed to interact with a webhook to send a notification to your smartphone.

It interfaces with a high-precision water flow sensor with a K-factor of 20.

Flashing

python -m esptool  --port /dev/tty.usbserial-1420 --chip esp32 write_flash 0x00010000 .pio/build/esp32/firmware.bin

Bootloader

The ESP32 requires a second stage bootloader that will read the partition table and boot the corresponding app. The booloader is located in the bootloader.bin file and should be flashed at address 0x1000 in the flash.

python -m esptool  --port /dev/tty.usbmodem14301 --chip esp32 write_flash 0x1000 bootloader.bin

Partition Table

This project utilises a custom partition table to make enough room for OTA updates. The partition definitions can be found in partitions.csv file. The partition table should be flashed at address 0x8000 in the flash after building the project with PlatformIO.

python -m esptool  --port /dev/tty.usbmodem14301 --chip esp32 write_flash 0x8000 .pio/build/default/partitions.bin

Application

The application itself should be flashed at address 0x10000 (or 0x210000 if using OTA), corresponding to the address defined in the bootloader table.

python -m esptool  --port /dev/tty.usbmodem14301 --chip esp32 write_flash 0x10000 .pio/build/default/firmware.bin