Flow Sensor

Installing and configuring an ESP32, with a flow sensor into Home Assistant

ESP32 4 way Relay Board
https://amzn.to/3ZqxRWO

Documentation Reference:
https://templates.blakadder.com/assets/ESP12F_Relay_X4.pdf

GPIO pintouts as shown in the pic.

Flow Sensor
https://amzn.to/3ZmfRfW

Connect Flow sensor to 3.3v, Gnd and GPIO15

Connect Water Full sensor to GPIO01 and Gnd

Waste Full sensor to GPIO03 and Gnd

use Google Gemini AI, with this prompt : (or ammend to your requirements)

I'm creating a water tank fill level sensor for my campervan using ESPHome. I have a flow sensor connected to GPIO pin 15 with a calibration factor of 450 pulses per liter. The fresh water tank has a capacity of 90L and a full sensor connected to GPIO pin 12. The waste water tank has a capacity of 45L and a full sensor connected to GPIO pin 14.

Please provide an ESPHome configuration that:

Uses a pulse_counter to measure the flow from the sensor.
Calculates the water level in both tanks using template sensors.
Integrates the full sensors into the tank level calculations.
Sets the fresh water tank level to full when the full sensor is triggered.
Keeps the waste water tank level at zero until the full sensor is triggered or the estimated level reaches the tank's capacity.

The configuration should accurately track the water levels in both tanks based on the flow sensor data and the state of the full sensors."

ESPHome Flow sensor

binary_sensor:

###########################

# Tank Level Sensors

###########################

- platform: gpio

pin:

number: 01 # Replace with the actual pin for fresh water tank full sensor

mode: INPUT_PULLUP

id: fresh_water_tank_full

- platform: gpio

pin:

number: 03 # Replace with the actual pin for waste water tank full sensor

mode: INPUT_PULLUP

id: waste_water_tank_full

sensor:

###########################

# Flow Sensor Pulse Counter

###########################

- platform: pulse_counter

pin:

number: 15

mode:

input: true

pullup: true

id: flow

unit_of_measurement: 'L/min'

accuracy_decimals: 2

update_interval: 1s

icon: "mdi:water"

filters:

# https://www.amazon.co.uk/dp/B07DVD4SKJ?ref=ppx_yo2ov_dt_b_fed_asin_title

- lambda: return (x/450);

- platform: integration

unit_of_measurement: 'm³'

id: flow_m3

accuracy_decimals: 2

sensor: flow

time_unit: min

icon: "mdi:water"

filters:

- multiply: 0.001 # convert Liter to m³

- platform: integration

id: flow_liter

unit_of_measurement: 'L'

accuracy_decimals: 2

sensor: flow

time_unit: min

icon: "mdi:water"

###########################

# Fresh Water Tank Level

###########################

- platform: template

id: fresh_water_tank_level

unit_of_measurement: 'L'

accuracy_decimals: 0

icon: "mdi:water-tank"

lambda: |-

static float fresh_water_level = 0.0; // Start with the tank empty

// Set level to full if the full sensor is triggered

if (id(fresh_water_tank_full).state) {

fresh_water_level = 91.0;

} else {

fresh_water_level += (id(flow).state * 60.0) / 1000.0; // Add flow in L/min converted to L/s

if (fresh_water_level >91.0) {

fresh_water_level = 91.0; // Cap at tank capacity

}

return fresh_water_level;

###########################

# Waste Water Tank Level

###########################

- platform: template

id: waste_water_tank_level

unit_of_measurement: 'L'

accuracy_decimals: 0

icon: "mdi:water-tank-outline"

lambda: |-

static float waste_water_level = 0.0; // Start with the tank empty

// Set level to full only when the full sensor is triggered

if (id(waste_water_tank_full).state) {

waste_water_level = 66.0;

} else if (waste_water_level >= 45.0) { // Alternatively, set to full when estimated level reaches capacity

waste_water_level = 66.0;

} else {

waste_water_level += (id(flow).state * 60.0) / 1000.0; // Add flow in L/min converted to L/s

}

return waste_water_level;