Microcontroller Based AutomaticMultichannel Temperature MonitoringSystem

[摘要] The term Monitoring system also called data logger is commonly used to describe a self-contained, standalone data acquisition system or device that automatically records, scans and retrieves the data with high speed and greater efficiency during a test or measurement. In this paper, 3 interconnected microcontrollers PIC18F4620, PIC18F262 and PIC16F876A using SPI and UART serial communications has been used. The Program is developed using C programming in MPLAB environment and compiled using MPLAB C 18 C Compiler into .hex file before is written into the microcontroller. LM35DZ and K-type thermocouples are selected as temperature sensors, and SD card and 16×2 dot matrix LCD, mobile phone for GSM modem and DS1307 for real time clock chip are interfaced with the 3 microcontrollers accordingly. The 4×4 matrix keypad uses 8 bit data lines to interface with the microcontrollers.

[关键词] Ef f i c i e n c y;Mi c r o c o n t r o l l e r;UART;Compiler;Thermocouples;Serial Peripheral Interface