Furnace High-Temperature Monitoring and Logging System

The Furnace High-Temperature Monitoring and Logging System operates by measuring extreme heat through a specialized physical sensor and translating those readings into digital data that a computer can process and store. At the core of the sensing mechanism is a K-type thermocouple wire, which generates a minute, temperature-dependent voltage differential across its dissimilar metal junctions when exposed to high heat. Because this raw analog voltage is extremely small and susceptible to environmental noise, it cannot be read directly by a standard microprocessor. Instead, the thermocouple connects to a MAX6675 SPI module. The MAX6675 acts as a dedicated analog amplifier and analog-to-digital converter, specifically designed to read thermocouple signals, perform cold-junction compensation to correct for ambient temperature variations, and digitize the measurement into a 12-bit format. The Raspberry Pi 5 interacts with this module using the Serial Peripheral Interface (SPI) communication protocol, requesting and receiving temperature data via dedicated clock and data lines. Running Raspbian OS and executing Python scripts utilizing the Adafruit MAX library, the system polls the module at regular intervals. Once acquired, the temperature values can be displayed, monitored in real-time within Python IDLE, or logged to a file for ongoing thermal analysis of industrial processes.