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Thermometer Circuits
Last Updated on: Saturday, August 30, 2014 10:28 AM

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

AN-18: Thermometer Applications of the REF-02 -  AN-18 Analog Devices Application Note....[App Note]
AT89C2051 Digital Thermometer & Clock -  (electronic diagram added 6/03)
Celsius-to-digital thermometer works with remote sensor -  15-Apr-04 Issue of EDN  You can use a single-supply system to precisely measure the temperature at a remote location with less than 1°C error over a 0 to 100°C range (Figure 1). The circuit includes T1, a low-cost AD590 temperature sensor; IC1, an AD8541 rail-to-rail amplifier; four resistors; a trimming potentiometer; and an ADC.... [Design Idea by Elana Lian and Chau Tran, Analog Devices, Wilmington, MA]
Dual Digital Thermometer -  This application shows how to use the PIC16F877 to control, and interface with the Dallas DS1820 1-Wire™ Digital Thermometer.  If you missed the LCD connection schematic for these experiments, …(added 11/05)
LB-27: Micropower Thermometer -  National Semiconductor Application Note  (app note added 2/06)
LCD Thermometer (Seiichi Inoue) -  (app note added 8/03)
LCD thermometer 1 -  Build your own temperature meter for fun.  This project uses the Microchip TC77 digital temperature sensor, a PIC16F871 microcontroller and a 7-segment 3˝ digit LCD. You can study the source code on how to drive an LCD display….. [Peter Jakab, Electrical Engineer, Engineer of Informatics]

LTC1392: Temperature & Voltage Measurement in a Single Chip -  DN106  Design Notes (Linear Technology) (app note added 1/06)
MicroMinimal Thermometer -  ….must register on this site.... [Published in Elecktor July/August 2010]
Micropower Thermometer -  National Semiconductor Application Note  (app note added 2/06)
PC Based thermometer Based on Dallas DS1621 -  (electronic circuit added 4/05)
PC Thermometer -  (electronic circuit added 09/05)
Quartz crystal-based remote thermometer features direct Celsius readout -  17-Mar-05 Issue of EDN  Although quartz crystals have served as temperature sensors, designers haven't taken advantage of the technology because few manufacturers offer the sensors as standard products (references 1 and 2]. In contrast to conventional resistance- or semiconductor-based sensors, a quartz-based sensor provides inherently digital-signal conditioning, good stability, and a direct digital ou.... [Design Idea by Jim Williams and Mark Thoren, Linear Technology Corp; Edited by Brad Thompson]
Temperature & Voltage Measurement in a Single Chip LTC1392 -  DN106  Design Notes (Linear Technology) (app note added 1/06)
Temperature controller -  Schematic only, no circuit description
Temperature Controller -  Remote sensor sends data via mains supply Temperature range:00.0 to 99.9 °C....
Temperature Controller (AVR + DS1621) -  Wine doesn't like subzero temperatures, and during wintertime, my "winecellar" got pretty cold. There was an electric heating element, but the thermostat was broken, so it was either full burn or nothing. That's how the temperature monitor/controller came to be. It was an obvious task for a small processor and I've always wanted to test the Dallas temperature sensors. So, I designed this little device which could monitor the temperature and control the heater. It's based on an AT90S2313 and a Dallas DS1621 Digital Thermometer. The temperature is displayed on a dual 7-segment....
Temperature Measurement -  Measures temperature via SMT160-30, shows it on LCD and communicates with RS232 (sends values of temperature to terminal ....
Thermocouple Interfaces to Serial Port -  11/09/95 EDN-Design Ideas....The circuit in Figure 1 acquires temperature data via an IBM PC serial port using a thermocouple-based sensor. The sensor is a type-K (chromel-alumel]thermocouple. When in contact, the dissimilar metals produce a potential difference that is a function of temperature. Additional thermocouple junctions.... EDN is migrating links. This link is not verified.  Search the "title" + "EDN" for new link.
Thermoelectric Controller Scriptable Thermometer -  A unified thermometric controller that can be programmed with simple scripts, integrating the "classic" thermometer/controller pair. You can build a variety of simple machines with the same hardware and a different script : a charting thermometer, a vending machine that dials your number when empty, a leavening cell(added 6/06)
Thermometer -  (application / block diagram added 6/07)
Thermometer Applications of the REF-02 -  AN-18 Analog Devices Application Note....[App Note]
Thermometer with Four-Digit LED Display -  Until recently, the Philips SAA1064 LED driver IC has been a sort of unofficial standard for driving seven-segment LED displays. It can be used to implement four-digit displays that can be driven over an I2C bus….must register on this site.... [Published in Elecktor July/August 2010]
Thermostat With Adjustable Hysteresis -  This small thermostat allows you to select the size of its hysteresis. You can set both the temperature at which the relay will energize, and the temperature at which the relay will de-energize. The difference between these two temperatures is the hysteresis.... [Circuit Design by Ron J.]
Thermostat with LED Temperature Display -  I needed to replace two old, unreliable thermostats for controlling the heating and cooling for a large garden shed. Commercial basic thermostats are available quite cheaply, but some lack the ability to control heavy loads or have the extra features that I require for saving energy when the door is often left open or to indicate temperature being out of range etc. I like the PIC18F1320 microcontroller used in my previous project, so decided to use it again in a very similar design to drive three multiplexed LED displays and read the temperature from a Dallas/Maxim DS18x20 "1-Wire" sensor. ….(design added 11/08)
Transistor Forms RS232C Digital Thermometer -  05/09/96 EDN-Design Ideas....An ordinary transistor can serve as an uncalibrated temperature sensor (Figure 1)for an accurate, PC-compatible thermometer. Unadjusted accuracy is more than0.5°:C over the -50 to +50°C range, and the only limitation on resolution is the time devoted to measurement acquisition. For example,0.1°:C resolution requires.... EDN is migrating links. This link is not verified.  Search the "title" + "EDN" for new link.

Thermometer Circuits

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