ESPHome TN9

A ESPHome custom sensor for TN9 Infrared temperature sensor This library integrates a freetronics TN9 sensor with ESPHome using both the IR temperature sensor and ambient temperature sensor. It uses the official library available at https://github.com/freetronics/IRTemp as a dependency.

Setup

1. Put the file tn9.h into the same directory as your .yaml file for ESPHome. On HomeAssistant this is the path config/esphome/tn9.h. You may also need to change the GPIO pins corresponding to your setup at the top of the file, or any of the other #define variables.
2. Update your .yaml file to include the custom sensor's file. This means adding a includes section under esphome: in the .yaml file. For example the top of my configuration file looks like:

esphome:
  name: livingroom
  platform: ESP32
  board: esp-wrover-kit
  includes:
    - tn9.h

3. Configure the sensor in your .yaml file. You can change the name of the sensors if you want. This is how they will show up in ESPHome (and on your HomeAssistant dashboard if you are using HomeAssistant)

sensor:
  - platform: custom
    lambda: |-
      auto temp_sensor = new IRTempSensor();
      App.register_component(temp_sensor);
      return {temp_sensor->ambient_sensor, temp_sensor->ir_sensor};
    sensors:
      - name: "Ambient Temperature"
        unit_of_measurement: '°C'
        accuracy_decimals: 2
      - name: "Infrared Temperature"
        unit_of_measurement: '°C'
        accuracy_decimals: 2

4. Put the IRTemp library files in the appropriate directory. You will need to clone https://github.com/freetronics/IRTemp and put IRTemp.cpp and IRTemp.h into the src folder of your ESPHome configuration. For example, my sample configuration named "livingroom" configured through HomeAssistant would need the files put into the path config/esphome/livingroom/src
5. Upload the new configuration to your ESPHome device. You're done, that's it !