esphome ESP32 Water Level Sensor

README.md

Sump pit water level sensor

This is an ESPHome configuration for an ESP32 that monitors a sump pump pit, using the ESP32 capacitive touch sensors, with a level being reported to Home Assistant.

ESP32 Wiring

The ESP32 is mounted on a piece of PVC pipe, with wires extending down to different lengths. I used a length of old ethernet cable I had sitting around.

There's also a wire at the bottom connected to the ground pin, and this gives more reliable touch sensor values. The USB32 is powered from USB.

Pin	Touch	Color	Depth
GPIO32	touch9	white/blue	45cm
GPIO33	touch8	blue	40cm
GPIO27	touch7	white/blue	35cm
GPIO14	touch6	green	30cm
GPIO12	touch5	white/green	25cm
GPIO13	touch4	brown	20cm
GPIO15	touch3	white/brown	15cm
GPIO4	touch0	orange	10cm
GND		white/orange

connections.jpg

contacts.jpg

installed.jpg

waterlevel.yml

substitutions:
  name: sump_pit
  display_name: Basement Sump Pit
  touch_threshold: "750"

esphome:
  name: $name

esp32:
  board: esp32dev
  framework:
    type: arduino

# Enable logging
logger:

# Enable Home Assistant API
api:

ota:
  password: "xxxxxxxxxxxxxxxx"

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "$name"
    password: "xxxxxxxxx"

captive_portal:

status_led:
  pin: GPIO2

esp32_touch:
  setup_mode: false

binary_sensor:
  - platform: esp32_touch
    id: touch0
    pin: GPIO4
    threshold: $touch_threshold
    on_state:
      then:
        - component.update: level_numeric
  
# GPIO0 (touch1) isn't available
# GPIO2 (touch2) is LED

  - platform: esp32_touch
    id: touch3
    pin: GPIO15
    threshold: $touch_threshold
    on_state:
      then:
        - component.update: level_numeric

  - platform: esp32_touch
    id: touch4
    pin: GPIO13
    threshold: $touch_threshold
    on_state:
      then:
        - component.update: level_numeric

  - platform: esp32_touch
    id: touch5
    pin: GPIO12
    threshold: $touch_threshold
    on_state:
      then:
        - component.update: level_numeric
  - platform: esp32_touch
    id: touch6
    pin: GPIO14
    threshold: $touch_threshold
    on_state:
      then:
        - component.update: level_numeric
  - platform: esp32_touch
    id: touch7
    pin: GPIO27
    threshold: $touch_threshold
    on_state:
      then:
        - component.update: level_numeric
        
  - platform: esp32_touch
    id: touch8
    pin: GPIO33
    threshold: $touch_threshold
    on_state:
      then:
        - component.update: level_numeric

  - platform: esp32_touch
    id: touch9
    pin: GPIO32
    threshold: $touch_threshold
    on_state:
      then:
        - component.update: level_numeric
        


sensor:
  - platform: template
    name: "$name Level"
    id: level_numeric
    unit_of_measurement: cm
    lambda: |-
      if (id(touch9).state) { return 45; }
      if (id(touch8).state) { return 40; }
      if (id(touch7).state) { return 35; }
      if (id(touch6).state) { return 30; }
      if (id(touch5).state) { return 25; }
      if (id(touch4).state) { return 20; }
      if (id(touch3).state) { return 15; }
      if (id(touch0).state) { return 10; }
      return 0;
      
  - platform: wifi_signal
    name: "$name WiFi Signal Sensor"
    update_interval: 60s

text_sensor:
  - platform: wifi_info
    ip_address:
      name: "$name IP Address"
  - platform: version
    name: "$name ESPHome Version"