pizza_oven_sensor.yaml

### Pizza Oven Temperature sensor ###


##OLED Fonts ### you will need to download the ttf font for the OLED display and place them in your esphome config dir e.g //homeassistants/config/esphome
# slkscr.ttf - https://www.dafont.com/silkscreen.font
# BebasNeue-Regular.ttf - https://www.dafont.com/bebas-neue.font
# arial.ttf - https://www.dafont.com/bebas-neue.font?text=arial.ttf

## Parts used ###
#£14.50 MakerHawk ESP32 Module OLED Display WiFi Development Board WIFI Kit 32 Low Power Consumption 240 MHZ Dual Core with CP2012 Chip 0.96inch Display ( https://www.amazon.co.uk/gp/product/B076P8GRWV/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1 )
#£7.88   SNOWINSPRING 1 Set Max6675 Module + K Type Thermocouple Sensor Module for & 1Pcs K Type 50X5Mm 800C Probe Thermocouple ( https://www.amazon.co.uk/dp/B08HQ81MVH/ref=cm_sw_em_r_mt_dp_ZCKQDF06XT6TAQXFFYPH )

## Resources ##
# https://resource.heltec.cn/download/WiFi_Kit_32/WIFI_Kit_32_pinoutDiagram_V2.pdf
# https://esphome.io/components/sensor/max6675.html?highlight=max6675

## Wiring of the esp32 to the sensor ###
# esp32 pin GND to max6675 gnd
# esp32 pin 3.3v to max6675 vcc  (104nf cap between vcc & gnd)
# esp32 pin 2 (cs) to max6675 (CS)
# esp32 pin 18 (SCK) to max6675 (SCK)
# esp32 pin 19 (miso) to max6675 (SO)

## Thingiverse Files for Case
# https://www.thingiverse.com/thing:4855762


esphome:
  name: pizza_oven_sensor
  platform: ESP32
  board: heltec_wifi_kit_32

wifi:
  networks:
  - ssid: !secret wifi_ssid   # Home Wifi details
    password: !secret wifi_password
  - ssid: !secret wifi_ssid2  # Mobile Phone hotspot for when out of range of home wifi
    password: !secret wifi_password2
  - ssid: !secret wifi_ssid3  # TP-Link Wifi Extender
    password: !secret wifi_password3

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Pizza Oven Sensor"
    password: "YsP2eRCdRPPK"

captive_portal:

# Enable logging
logger:

# Enable Home Assistant API
# api:

# MQTT settings instead of using the normal api because the area I use the pizza oven has poor WiFi coverage so I can use my phone to connect to my MQTT from outside my LAN. If you don't have this problems (comment out this sections and uncomment out "api:"" if you have both you get repeated device restarts)
mqtt:
  broker: !secret mqtt_broker
  username: !secret mqtt_username
  password: !secret mqtt_password
  discovery_retain: false

ota:

sensor:
### Wifi Signal Strength  ####
  - platform: wifi_signal
    name: "Pizza Oven Sensor WiFi Signal"
    update_interval: 30s
    id: wifisignal

### current Thermocouple sensor ###
  - platform: max6675
    name: "Pizza Oven Temperature"
    accuracy_decimals: 0
    cs_pin: 2
    update_interval: 2s
    filters: # filter used to smooth out sensor data noise
      - sliding_window_moving_average:
          window_size: 10
          send_every: 10
      - calibrate_linear: # Map 0.0 (from sensor) to 0.0 (true value)
          # - 7.2 -> 0.0 # Iced water
          - 24 -> 20 # Room Temp
          - 103.0 -> 100 # Water @ Rolling Boil
### current Thermocouple sensor ###
  - platform: max6675
    name: "Pizza Oven Temperature Display"
    accuracy_decimals: 0
    cs_pin: 2
    update_interval: 1s
    id: thermocouple
    internal: true
    filters: # filter used to smooth out sensor data noise
      #- sliding_window_moving_average:
      #    window_size: 10
      #    send_every: 10
      - calibrate_linear: # Map 0.0 (from sensor) to 0.0 (true value)
          # - 7.2 -> 0.0 # Iced water
          - 24 -> 20 # Room Temp
          - 103.0 -> 100 # Water @ Rolling Boil

## Minimum Temp over 10mins
  - platform: max6675
    name: "Pizza Oven Temperature - Minimum"
    accuracy_decimals: 0
    cs_pin: 2
    update_interval: 20s
    id: thermocouple_min
    filters:
      - min:
          window_size: 60  ## min in 10 minutes (10mins*60seconds / Update interval 10s)
          send_every: 1
      - calibrate_linear: # Map 0.0 (from sensor) to 0.0 (true value)
          # - 7.2 -> 0.0 # Iced water
          - 24 -> 20 # Room Temp
          - 103.0 -> 100 # Water @ Rolling Boil
## Maximum Temp over 10mins
  - platform: max6675
    name: "Pizza Oven Temperature - Maximum"
    accuracy_decimals: 0
    cs_pin: 2
    update_interval: 20s
    id: thermocouple_max
    filters:
      - max:
          window_size: 60  ## max in 10 minutes (10mins*60seconds / Update interval 10s)
          send_every: 1
      - calibrate_linear: # Map 0.0 (from sensor) to 0.0 (true value)
          # - 7.2 -> 0.0 # Iced water
          - 24 -> 20 # Room Temp
          - 103.0 -> 100 # Water @ Rolling Boil

spi:
  miso_pin: 19
  clk_pin: 18

# add fonts for OLED Display
font:
  - file: 'slkscr.ttf'
    id: font1
    size: 8

  - file: 'BebasNeue-Regular.ttf'
    id: font2
    size: 40

  - file: 'arial.ttf'
    id: font3
    size: 12

  - file: 'materialdesignicons-webfont.ttf'
    id: icon_font
    size: 20
    glyphs: [
      # Wifi signal strength icons
      '󰤯', # mdi-wifi-strength-outline
      '󰤟', # mdi-wifi-strength-1
      '󰤢', # mdi-wifi-strength-2
      '󰤥', # mdi-wifi-strength-3
      '󰤨', # mdi-wifi-strength-4
    ]

### OLED Setup ###
i2c:
  sda: 4
  scl: 15

display:
  - platform: ssd1306_i2c
    model: "SSD1306 128x64"
    reset_pin: 16
    address: 0x3C
    lambda: |-

      // Print Pizza Oven Temp (from thermocouple sensor)
      if (id(thermocouple).has_state()) {
        it.printf(128, 60, id(font2), TextAlign::BASELINE_RIGHT , "%.1f°C", id(thermocouple).state);
      }

      // Print Maximum temperature
      if (id(thermocouple_max).has_state()) {
        it.printf(127, 10, id(font3), TextAlign::TOP_RIGHT , "Max:%.0f°C", id(thermocouple_max).state);
      }
      // Print Minimum temperature
      if (id(thermocouple_min).has_state()) {
        it.printf(0, 10, id(font3), TextAlign::TOP_LEFT , "Min:%.0f°C", id(thermocouple_min).state);
      }

      // Draw the outline of a rectangle with the top left at [50,60], a width of 30 and a height of 42
      it.rectangle(0, 0, 128, 10);

      // Print "Pizza Oven Temp" in top center.
      it.printf(64, 1, id(font1), TextAlign::TOP_CENTER, "Pizza Oven Temperature");

      // WiFi signal strength icon
      int x, y;
      if(id(wifisignal).has_state()) {
        // Set location of Wifi Signal Icon
        x = 0, y = 44;
        if (id(wifisignal).state >= -50) {
            //Excellent
            it.print(x, y, id(icon_font), "󰤨");
        } else if (id(wifisignal).state  >= -60) {
            //Good
            it.print(x, y, id(icon_font), "󰤥");
        } else if (id(wifisignal).state  >= -67) {
            //Fair
            it.print(x, y, id(icon_font), "󰤢");
        } else if (id(wifisignal).state  >= -70) {
            // Weak
            it.print(x, y, id(icon_font), "󰤟");
        } else {
            // Unlikely
            it.print(x, y, id(icon_font), "󰤯");
        }
      }