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Osmosis Water Filter with ESP32

This project contains the program controlling my osmotic water filter using an ESP32.





Components

  • Heltec WiFi LoRa 32 (V2)
  • HX711 + scale sensor
  • TDS meter sensor
  • 4 channel relay module

TODOs

  • Flush membrane and standing water before filtering water to prevent contamination.
  • Flush membrane after filtering water to prevent membrane from calcification.
  • Only flush when necessary by storing last flush time.
  • Flush membrane and standing water every 4 hours to prevent contamination.
  • Disinfection program (filter small time amount, rest for 15 minutes, repeat 10 times, flush membrane, filter water).
  • Add button to trigger disinfection program.
  • HTTP REST call to send event-status to backend.

Configuration

Create the file platformio.ini:

[env:heltec_wifi_lora_32_V2]
platform = espressif32
board = heltec_wifi_lora_32_V2
build_flags = 
	-DWIFI_SSID='"change-me"'
	-DWIFI_PASSWORD='"change-me"'
framework = arduino
lib_deps = 
	heltecautomation/Heltec ESP32 Dev-Boards@^1.1.0
	bogde/HX711@^0.7.5
	arkhipenko/TaskScheduler@^3.6.0
	robtillaart/StopWatch@^0.3.2
monitor_speed = 115200