DIY Cooking Temperature Meter

Introduction

A simple (but updatable) cooking thermometer based on ESP32.

Functions

• Measure, log, display and save the temperature
• Send data using bt or create a local web server which shows the data.
• Allow taking timed photos (a photo at a given time) and show it on a (saved) temp log.

Material

• 

  The ESP 32

• 

  The front side of the ESP32 with the display

• 

  The battery shield from the front.

• 

  The battery shield from the back. The two leds1, L1 and L2 are in the middle of the board.

• 

  A sample file from the provider.

List

• ESP32: ideaspark® ESP32 Entwicklungsboard 1,14 Zoll 135x240 full color LCD-Display,CH340,WiFi+BL. ST7789 driver, I2C. CH340
  • Display area: 14.864 × 24.912 mm²
  • Panel size: 17.6 × 31.0 × 1.6 mm³
  • Display current 20mA.
  • Display ports: VCC: VCC, GND: GND, D2(GPIO2): DC, D4: RST, D15: CS, D18: SCLK, D23: MOSI, D32: BLK.
  • https://manuals.plus/asin/B0D6QXC813
    • Note: WiFi and Display Coexistence (Important)
• Temperature probe; THERMOPRO copy (including TP20, TP17, and TP-16, TP-16S,TP08S, TP25, TP07, TP17H, TP27, TP06S, TP09, TP28). Max temp 380°C (716°F) with 3.5 mm stereo jack.
• Battery pack: Battery Shield V3 Raspberry Pi / Arduino / ESP32 - 1x 18650 (from FunDuino)
  • https://nerd-corner.com/download/1039/?tmstv=1755621929
  • Breakdown of the components: https://www.edn.com/battery-shield/
  • https://nerd-corner.com/review-battery-shield-v3-diy-powerbank-with-lipo-18650/
  • https://www.youtube.com/watch?v=T70mBHeIOZA

ESP32

• 

Powering

• Never connect an external power source to the 3V3 pin while powering the ESP32 board via USB. This will cause damage to many boards!
• The VIN pin (sometimes labeled V5 or V5.0) can be used to power the ESP32 with an external regulated 5V DC power source
• you can power your ESP32 development board via the 3V3 pin.

Battery Pack

No reverse voltage protection!

The charging voltage is 4.2 V and the charging current is 500 mA. Note the on/off switch, when plugging or unplugging the lipo battery, the On/OFF switch only switches the USB port. The 3 x 3 V and 3 x 5 V solder pins cannot be switched on and off by this switch

Deep discharge protection

The charging process on the module is indicated by a LED. Red means that the battery is charging and green signifies that charging is complete.

The battery shield connec

Programming

• Show the temperature log.
• Create a wifi and a local webserver

https://github.com/ImpulseAdventure/GUIslice https://blog.kamlatech.in/live-plot-sensor-data-on-tft-display

LVGL graphical library