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Mod-NTC for ESPHome and Home Assistant

Microfire

Microfire

• 2 min read

In this write-up, we will install ESPHome to get NTC temperature measurements into Home Assistant.

  • We will be working in a terminal and using a few commands
  • You'll need a Home Assistant installation running
  • An ESP-device
  • A Mod-NTC module and preferably a carrier board

1.

šŸ“¦ Install ESPHome

Follow the instructions on the ESPHome website.

2.

šŸ Start a project

Type esphome wizard mod-ntc.yaml in the terminal. Make sure the path on the terminal is where you want the project to be. Follow the steps, and there should be a mod-ntc.yaml file in the directory you ran the command in. If you type esphome compile mod-ntc.yaml you should see the project compile.

3.

šŸ’» Add some YAML and code

We'll make a custom sensor component to get the Mod-NTC module working. This is done by adding some lines to the YAML.

The YAML file should be changed to the following:

substitutions:
  friendly_name: Microfire Mod-NTC
  device_name: microfire-mod-ntc
esphome:
  name: $device_name
esp32:
  board: esp32dev
  framework:
    type: arduino
logger:
api:
ota:
wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password
  ap:
    ssid: $device_name
    password: !secret wifi_failover
captive_portal:

# import the mod-ntc component
external_components:
  - source:
      type: git
      url: https://github.com/u-fire/ESPHomeComponents/

# https://esphome.io/components/i2c.html
i2c:
  sda: 21
  scl: 22

sensor:
  - platform: mod_ntc
    id: ntc
    name: Temperature
    beta: 3950

button:
  - platform: factory_reset
    name: Restart with Factory Default Settings

Make sure you change the wifi section to your network and password if you aren't using a secrets.yaml. Check that the i2c section is using the correct pins.

4.

šŸ”Œ Connect everything

Now is a good time to ensure the module is connected to the ESP-device.

  1. Connect the probe: the probe has no polarity and can be connected either way
  2. Make the I2C connections:
  • Mod-NTC SDA to controller SDA
  • Mod-NTC SCL to controller SCL
  • Mod-NTC GND to controller ground
  • Mod-NTC VCC to controller 3.3 or 5-volt

5.

āž”ļø Upload

Type esphome run mod-ntc.yaml It will compile the project and ask you which serial device to upload the code to. After that, you'll see the ESP debug output. If everything goes to plan, you should see a device has been discovered in Home Assistant.

6.

šŸ  Home Assistant

From within Home Assistant, press Settings > Devices & Services and find the device in the ESPHome integration box. Click it and then click where it says 1 Device. You should see a screen with all the information, Mod-NTC measurement, and a button to reset the device. You can create dashboards, scripts, and anything else Home Assistant can do from here.

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