资料介绍
This application note describes a temperature sensor
using a PICmicro
®
microcontroller. This temperature
sensor is unique because it can work through non-fer-
romagnetic walls. Interfacing to a thermistor is normally
a very straightforward task. Interfacing to a thermistor
on the other side of a wall gets a little more compli-
cated. Interfacing through walls can be a very valuable
feature in certain applications, notably temperature
sensing for refrigerators or sensing inside of a hazard-
ous gas environment where an isolation barrier is a
safety issue.
AN850
Inductively Coupled Thermistor
This method is inappropriate for a through wall temper-
Author: Joseph Julicher ature system because it requires a wire to connect the
Microchip Technology Inc. thermistor to the PICmicro MCU. DC currents cannot
be transmitted through a wall, so this method cannot be
directly converted to a through wall system.
INTRODUCTION
To sense th
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