Oven Temp Monitor

ESP32-based dual thermocouple monitor with SSD1306 display and NeoPixel status LED. Uses MAX31855 sensors to show two probe temperatures and includes menu controls via rotary encoder with push button.

Hardware

• ESP32 DevKitC (esp32dev)
• Two MAX31855 thermocouple amplifiers (CS pins: 23, 4; SCK 18; MISO 19)
• SSD1306 128x64 I2C OLED (SDA 21, SCL 22)
• Rotary encoder with push switch (CLK 25, DT 26, SW 27)
• Single NeoPixel on pin 5

PlatformIO

• Environment: esp32-wroom-32
• Serial monitor: 115200 baud
• Upload speed: 921600 baud
• Default upload port: COM4 (adjust as needed)

Build & Upload

pio run
pio run -t upload
pio device monitor

Menu

• Double click: enter/exit menu
• Single click (in menu): toggle edit mode
• Long press: exit menu or pause/resume
• Encoder turn: navigate items or adjust (units, per-probe offset, LED brightness)