ESPHome with M5 Stack Tube pressure sensor

readme.md

ESPHome with M5 Stack Tube pressure sensor

Device documents: https://docs.m5stack.com/en/unit/tube_pressure

This device returns a linear voltage (0.1 - 3.1v) based on the pressure. This allows us to use the generic ADC device with EPShome. Due to the limited voltage range of the adc, you have to use the attentuate feature. I used attenuate: auto and it worked fine. I used a lambda function to convert the voltage to pressure (kPA) and to psi. The divide by 6.89... is the psi conversion. Then I round it to one decimal place. I added a device class of pressure and unit_of_measurement of psi.

I have the update interval set pretty fast. IRL, I will set that to ~30s

Here is the config yaml file:

esphome:
  name: pressure-1
  friendly_name: pressure_1
  
esp32:
  board: esp32dev
  framework:
    type: arduino

# Enable logging
logger:

# Enable Home Assistant API
api:
  encryption:
    key: "******************************"

ota:
  password: "******************************"

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

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Pressure-1 Fallback Hotspot"
    password: "*****************"

captive_portal:

sensor:
  # m5 stack tube pressure sensor (https://docs.m5stack.com/en/unit/tube_pressure)
  - platform: adc
    pin: 32
    name: "Tube pressure"
    unit_of_measurement: "psi"
    device_class: pressure
    update_interval: 1s
    attenuation: auto
    filters:
      - lambda: return ((x - 0.1) / 3.0 * 300.0 - 100.0) /6.89475729;
      - round: 1