Cistern Monitor

Uses several sensors measure the water level of a cistern and current draw from a 180 PSI irrigation pump

1. Pressure Sensor (https://www.amazon.com/gp/product/B07PXFPPMM)
2. Float Switch (https://www.amazon.com/gp/product/B095HMXX6G)
3. Current Transformer (https://www.amazon.com/gp/product/B07JNDRJQ4)
4. Flow Sensor (https://www.amazon.com/dp/B07MY6JHNR)
5. ADS1115 (https://www.amazon.com/dp/B01DLHKMO2)

FEATURES:

• High Water Float sensor (cistern overflow alarm)
• Low Water Float sensor (irrigation pump shutoff and alarm)
• Real time water level feedback via WebSockets
• HTML monitoring page
• OTA firmware updates
• WIFI SID and password via json config file

FIXME:

• show all stats on HTML page load (first load is missing CT value)
• send message to OpenSprinkler when low water alarm and CT current > 3amps

TODO:

• sleep mode (add motion detector; wake on trigger)
• Gateway, mask and IP address in config file
• JS: if last websocket message > 5 seconds, then timeout
• rewrite for Little FS and caching as per mathieucarbou/AsyncTCP#14 (comment)
• refactor arduino-libraries/Arduino_JSON usage to bblanchon/ArduinoJson @ 7.1.0 (which AsyncTCP uses)
• remove <Arduino.h> includes
• add water level to tab in parenthesis (<title>Cistern Water Level Monitor(43%)</title>)
• refactor src\Cistern_Monitor_SPIFF.ino to main.cpp; erase all git hub history for src\Cistern_Monitor_SPIFF.ino to remove wifi credentials
  • https://docs.github.com/en/authentication/keeping-your-account-and-data-secure/removing-sensitive-data-from-a-repository
  • rename project to open-cistern ??
• remove unnecessary trend detector stats code
• add current measurement histogram
• add timeout to realtime stats (turn off after 2 hours)
• add timestamp to high/low water alarm
• add flow sensor and stats
• js notification API
• move LCD code to lcd library directory
• time pump running since low water alarm
• time since last 0 current value (how long pump has been running)
• toggle state for when filling (alarm will sound on both high float, water percentage and timeout 40 minutes)
• MOSFET for 24v speaker alarm
• MOSFET for 24v float/pressure sensor loop for sleep mode / real-time stats

REFACTORING:

• use Arduino Nano Matter
• changing wiring to 10 wire pins with ADC1115, buck converter, ESP32 PCB blocks on single board
• single board contains voltage dividers, MOSFETs, etc
• no terminal blocks / use wire adapter

RESEARCH/IDEAS:

• use openthings to iframe app for remote
• curl post rain delay to open sprinkler on LOW_WATER_ALARM
• use Arduino Nano Matter
• integrate with Home Assistant

SCRATCH PAD:

ESP32 ACD ranges: 2450v 1750v 1250v

ADS1115 ranges: -0.256V ~ + 0.256V -0.512V ~ + 0.512V -1.024V ~ + 1.024V -2.048V ~ + 2.048V -4.096V ~ + 4.096 V -6.144V ~ + 6.144V

resistor calculations

Pressure Sensor 0.011 A * x = 4v x=360 ohms

0.011 A * x = 3.85v x=350 ohms

x * 360 = 1.68

======== Float Switch vs=24v r1=3000 r2=330 vout=2.378

.012 * x = 3 0.0106 * x = 2.45v

0.011 * x = 2.45v x=222

x=220 = 2.332v

y * 165 = 1.763

y = 0.01068 A 10.68 mA

283 ohms at 3v 330 ohms at 3.49v

?? ohms at 2.450v

cistern:

• get max pressure sensor value
• add intake check valve