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A CPU Temperature Sensor

Temperature sensor hardware and software source

(by bruce fishbein)

Eletronics schemes and 8051 assembly source code for an interesting temperature sensor device.
This article is online from 2488 days and has been seen 5173 times




(*** download for full text ***)

FanTemp: A CPU Temperature Sensor
by Bruce Fishbein

- Introduction
- FanTemp Hardware
- FanTemp Software
- FanTemp Construction
- FanTemp Operation
- Program Listing


Introduction
FanTemp is a temperature sensor for use in systems with motherboards containing
the LM78/LM79 system monitor chip. It contains a thermistor temperature sensing
element that can be attached to the CPU or other surface of interest and a
microcontroller-based circuit that measures the temperature and interfaces to
the LM78/LM79 through an unused fan connector on the motherboard.
This document describes the hardware and software design of FanTemp.
Information on the construction and operation of FanTemp are also included.

FanTemp Software

The FanTemp program is written in 8051 assembly language. A program listing is
included at the end of this document. The program is divided into initialization
routines, a main loop, and subroutines for measuring the temperature and
converting it to the LM78/LM79 output format.

(*** download for full text ***)



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