Sparkfun ESP32 Thing Plus + Sparkfun MCP9600 temperature sensor configuration for esphome

mcp9600.h

#include "esphome.h"
#include "SparkFun_MCP9600.h"

using namespace esphome;

class SFMCP9600 : public PollingComponent {
  public:
    MCP9600 myself;
    Sensor *thermocouple_sensor = new Sensor();
    Sensor *ambient_sensor = new Sensor();

    // Update every 5s
    SFMCP9600() : PollingComponent(5000) { }

    void setup() override {
      myself.begin();
      delay(100);
      myself.available();
    }

    void update() override {
      float thermocoupleTemperature = myself.getThermocoupleTemp(false);
      thermocouple_sensor->publish_state(thermocoupleTemperature);
      float ambientTemperature = myself.getAmbientTemp(false);
      ambient_sensor->publish_state(ambientTemperature);
    }
};

sensor.yaml

esphome:
  name: livingroom_radiator
  platform: ESP32
  board: esp32thing
  libraries:
    - "SparkFun MCP9600 Thermocouple Library"
  includes:
    - SparkFun_MCP9600.h # https://github.com/sparkfun/SparkFun_MCP9600_Arduino_Library/blob/master/src/SparkFun_MCP9600.h
    - mcp9600.h

wifi:
  ssid: "mywifinetwork"
  password: "mywifipassphrase"

api:
  reboot_timeout: 0s

# Enable logging
logger:

i2c:
  sda: 23
  scl: 22
  scan: True
  id: bus_a

sensor:
  platform: custom
  lambda: |-
    auto mcp9600 = new SFMCP9600();
    App.register_component(mcp9600);
    return {mcp9600->thermocouple_sensor, mcp9600->ambient_sensor};
  sensors:
    - name: "Thermocouple Temperature"
      unit_of_measurement: "°F"
      accuracy_decimals: 2
    - name: "Ambient Temperature"
      unit_of_measurement: "°F"
      accuracy_decimals: 2