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Temperature Sensors, Monitors & Detectors

1-Wire Technology Simplifies Humidity And Temperature Measurement 12/18/00 Electronic Design - Ideas for Design / A new 1-Wire technology component, the DS2438 Smart Battery Monitor provides several functions. Developed by Dallas Semiconductor, this device offers a unique 64- bit serial number, an internal temperature sensor, and an A/D that measures both the. . .

2 Chip Digital Thermometer Delivers 0.4C Accuracy 07/08/02 Electronic Design - Ideas for Design /  An LED digital thermometer with an operating range between 0C and 150C, 1C resolution, and 0.4C accuracy is presented in the figure. This design is based on the PIC16F872...  

4-To-20-mA Loop Powers Temperature Sensor 05/07/01 Electronic Design - Ideas for Design /  Using an analog temperature sensor, an op amp, a transistor, and a low-dropout linear regulator, this circuit provides a 4-to-20-mA output over a 3.75- to 28-V compliance range (see the figure).. . .

Accelerometer Output gives Temperature Info 11/19/98 EDN-Design Ideas

ADC's Reference Improves RTD Measurements 10/27/94 EDN-Design Ideas  

AT89C2051 Digital Thermometer & Clock

BASIC Stamp Thermoelectric Cooler

Build A Digital Temp Monitor 04/03/00 Electronic Design - Ideas for Design /  This Idea for Design was originally published Dec. 2, 1993. The AD590 proportional-to-absolute-temperature (PTAT) device combined with an autoranging digital multimeter (DMM), such as Fluke's Model 77, can make a stable digital. . .

Circuit Linearizes, Converts Thermistor Data 12/07/95 EDN-Design Ideas

Circuit provides cold junction compensation 11/28/2002  EDN - Design Ideas /  The accuracy of any circuit or system that uses a thermocouple to determine the temperature of a process is limited by the accuracy of the method used to perform cold-junction compensation. In a thermocouple measurement, two wires of dissimilar metal join together at the "hot," or measurement, junction..

Digital Remote Thermometer Remote sensor sends data via mains supply Temperature range:00.0 to 99.9 C

DS1820 Temperature Sensor Readout Unit

IC Diodes help Deduce Junction Temperature 07/07/94 EDN-Design Ideas

IC removes nonlinear temperature effects 09/25/03  EDN-Design Ideas / A common technique for removing nonlinear temperature-related effects from a dc voltage is to incorporate a temperature sensor that a microprocessor samples via an A/D converter. The processor determines—by mathematical calculation or a temperature-indexed look-up table—the amount of adjustment is necessary at a given temperature and delivers the resulting value via a D/A converter....

IC Temperature Sensor Provides Thermocouple ColdJunction Compensation National Semiconductor Application Notes,04-Nov-1995

Interfacing A Single-Wire Temperature-Sensor IC To A PC:  07/24/00 Electronic Design - Ideas for Design / Over the years, vendors have introduced a large assortment of temperature-measuring semiconductor devices with varying interfacing techniques. One of the latest of these, Maxim’s MAX6577, can measure temperature over a range of −40C to. . .
LCD Thermometer
LM34 / LM35 Precision Monolithic Temperature Sensors:  National Semiconductor Application Notes,04-Nov-1995
Low Cost Digital Thermometer Uses SingleChip Microcontroller :  02/18/02 Electronic Design - Ideas for Design / In many applications, the ability to read and display temperature is either desirable or an absolute requirement. Some of these applications include temperature probes, thermostats, CPU monitors, and process-control equipment. The ...  
Low Cost Digital Thermometer Uses SingleChip Microcontroller :  02/18/02 Electronic Design - Ideas for Design / In many applications, the ability to read and display temperature is either desirable or an absolute requirement. Some of these applications include temperature probes, thermostats, CPU monitors, and process-control equipment. The ...  
Low-Cost Digital Thermometer Uses Single-Chip Microcontroller:  02/18/02 Electronic Design - Ideas for Design / In many applications, the ability to read and display temperature is either desirable or an absolute requirement. Some of these applications include temperature probes, thermostats, CPU monitors, and process-control equipment. The . . .
Measure humidity and temperature on one TTL line:  08/30/2001 EDN - Design Ideas / By combining the responses of an Analog Devices (www.analog.com) AD590 temperature sensor and a Humirel (www.humirel.com) HS1101 humidity sensor, you can generate a single TTL-level signal containing information from both sensors (Figure 1). This design uses a 74HC123 monostable multivibrator, IC1, to form a free-running oscillator. .
Measure temperature in remote locations:  10/12/00 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit
Micropower Thermometer:  National Semiconductor Application Notes,28-Jun-1996
Miniature temperature monitors drive 3-speed fan controller:  02/22/99 Electronic Design - Ideas for Design / Combining a switch-mode dc-dc controller with two low-cost temperature monitor ICs produces a three-speed fan controller (see the figure). This useful. . .
Monitor Your PC's CPU Core Temperature:  09/05/00 Electronic Design - Ideas for Design / This circuit can be used to determine the core temperature of your PC’s CPU and display it on a monitor (Fig. 1). Installing such a circuit can help to ensure that your system’s cooling is. . .
Network imitates thermocouples:  11/08/2001 EDN - Design Ideas /   Thermocouples find widespread use for temperature measurement in systems. During system design or testing, you must observe the system's response at different temperatures. However, it's inconvenient to heat a thermocouple every time you need to check a system's performance. You can use the simple trick of touching the thermocouple with a hot soldering iron, but this method provides only ... .
Network of RS-485 smart temperature sensors:  08/23/99 Electronic Design - Ideas for Design / The system described here implements a smart temperature-sensor network. In this particular application, each of the intelligent network nodes is equipped with two temperature. . .
Oscillators Convert Temperature to Time:  03/30/95 EDN-Design Ideas
Parallel port provides high resolution temperature sensing:  10/03/2002  EDN - Design Ideas /  High-resolution temperature sensing at low cost is possible using only one chip attached to the PC's parallel port (Figure 1). The Dallas Semiconductor (www.dalsemi.com) DS1722 digital thermometer allows measurement resolution as fine as 0.0625C in digital form and with linear response. The accuracy specification is only 2C, but you can improve this figure by careful calibration..
PC Thermometer
Precision Thermometer Linearizes, Digitally Calibrates Platinum RTDs:  05/29/00 Electronic Design - Ideas for Design / Among temperature transducers, the platinum resistance temperature detector (PRTD) is generally accepted as the “gold standard.” PRTDs are available with interchangeability accuracies as tight as 0.1C over operational ranges extending from. . .
Precision Thermostat Uses TBH And AC Feed-Forward Compensation:  03/19/01 Electronic Design - Ideas for Design / Precision temperature control with relatively high-power heaters driven directly from unregulated "120-V" ac lines is an efficient, inexpensive way to manage large thermal loads. A number of annoying complications can render this straightforward. . .
Protect Digital Temperature Sensor In Noisy Environments :  06/21/04  Electronic Design - Design Briefs / Using digital temperature-sensing methods in a noisy environment is difficult, if not downright impossible. Noise is easily coupled into the temperature-sensing circuit and can result in a large temperature error. In fact, a very noisy environment can...
:  03/04/02 Electronic Design - Ideas for Design / Before the MAX6629/30/31/32 series of temperature sensors were available, all digital-output temperature sensors were I2C (alternatively called SMBus) sensors that had to be written to for addressing, before they were read. Prior SPI...  
:  12/21/95 EDN-Design Ideas
Self-Heated Transistor Thermo-stats Individual Components:  02/09/98 Electronic Design - Ideas for Design /  An unavoidable fact of life is that all parameters of all electronic components drift with temperature. Even the best voltage references, op amps, crystal oscillators, etc., have non-zero temperature coefficients. These effects can be handled by. . .
Sense junction temperatures without calibration:  05/13/98 Electronic Design - Ideas for Design /  Transistors can be used as a low-cost temperature sensors. Sensing temperature with a silicon junction often exploits the fact that the forward voltage drop has a temperature coefficient of −2.2 mV/C. The problem with this method is that. . .
Sensing Method Increases Thermal Response Time:  1/04/96 EDN-Design Ideas
Shower Stopper
Simple design equations for thermoelectric coolers:  02/23/98 Electronic Design - Ideas for Design /  Thermoelectric coolers (TECs) are versatile temperature control devices. They’re best thought of as solid-state heat pumps in which the direction and rate of heat flow can be manipulated by controlling the magnitude and polarity of the TEC drive. . .
Simplify Isolated Temperature Sensing With Single-Wire Sensors:  06/26/00 Electronic Design - Ideas for Design / Galvanic isolation of sensors, such as temperature sensors, is required since these sensors are often mounted in "mechanically inconvenient" locations. "Mechanically inconvenient" often implies an electrically noisy environment, an environment where. . .
Single Supply Circuit Linearizes RTDs:  12/21/95 EDN-Design Ideas
Single-Gate VHF Temperature Transmitter Runs On 3.6 V:  12/03/01 Electronic Design - Ideas for Design / This design idea illustrates what may be the simplest and smallest temperature transmitter in the VHF 50- to 100-MHz range. As seen in the figure, the design employs an ON SEMI single-gate IC (NL27WZ14). The. . .
Take Back Half: A Novel Integrating Temperature-Control Algorithm:  12/04/00 Electronic Design - Ideas for Design / According to Linear Technology’s Jim Williams, “The unfortunate relationship between servo systems and oscillators is very apparent in thermal control systems.” (Linear Applications Handbook, 1990). High-performance temperature control is. . .
Take-Back-Half HVAC Thermostat Is Precise And Energy-Efficient:  07/09/01 Electronic Design - Ideas for Design / Implementing tight control of environmental temperature is essential in many critical areas. For instance, it's necessary when research laboratories house sensitive instrumentation and for manufacturing facilities involved in high-precision. . .
Temperature Compensated PH Meter
Temperature Controlled Based on AT89CX051
Temperature measurement scheme uses IR sensor and sigma delta ADC:  04/03/03  EDN-Design Ideas / Many noncontact temperature-measurement systems use infrared sensors, such as thermopiles, which can detect small amounts of heat radiation. Biomedical thermometers that measure the temperature of an ear or a temple use noncontact temperature measurement, as do automotive-HVAC systems that adjust temperature zones based on the body temperature of passengers...
Temperature Measurement Scheme uses IR Sensor and Sigmadelta ADC:  04/03/03 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit
Temperature Monitor
Temperature Regulator #2
Temperature Sensor Circuit Provides Dual Slope Output :  01/21/02 Electronic Design - Ideas for Design / The excellent linearity of integrated-circuit temperature sensors makes them ideal for direct analog compensation of the thermally induced errors inherent in many circuits. For example, a negative-sloped temperature sensor could compensate for an...  
Temperature Sensor Doesn't Discharge Battery:  08/01/96 EDN-Design Ideas
Temperature Sensor uses I2C isolator:  06/05/96 EDN-Design Ideas
Temperature Strip-Chart Recorder Uses Parallel Port:  03/01/04 Electronic Design - Design Briefs /  A simple, inexpensive method for building a temperature strip-chart recorder involves a parallel port that communicates with four TMP121 IC temperature sensors (Fig. 1). The sensors communicate via the. . .
Temperature-Compensated LCD Bias Supply Uses A Single Control IC:  06/08/98 Electronic Design - Ideas for Design / Many applications require a simple method for getting multiple outputs from the power supply. One way to achieve this goal is by using charge pumps. The schematic shown in Figure 1 is an LCD bias. . .
Temperature-Sensor Circuit Provides Dual-Slope Output:  01/21/02 Electronic Design - Ideas for Design / The excellent linearity of integrated-circuit temperature sensors makes them ideal for direct analog compensation of the thermally induced errors inherent in many circuits. For example, a negative-sloped temperature sensor could compensate for an. . .
TempSentry Temperature Sensor Technical Info & Schematics
Thermistors and a Microcontroller Simplify Anemometer Design :  10/14/02 Electronic Design - Ideas for Design / Typically, air flow is measured with a hot-wire anemometer. Here's an alternative version of that concept using two thin-film platinum resistance temperature detectors. A high-performance mixed-signal microcontroller can make the measurement and drive...  
Thermocouple Interfaces to Serial Port:  11/09/95 EDN-Design Ideas
Thermocouple thermometer features a 1-mV/F output:  10/18/99 Electronic Design - Ideas for Design / An inexpensive, battery-powered, cold-junction-compensated, thermocouple thermometer with an output of 1 mV/F can be constructed using type-K thermocouple wire. Because type-K thermocouple. . .
Thermoelectric Controller (scriptable Thermometer)
Thermostat For High-Altitude Atmospheric Sampler is Fault-Tolerant:  11/19/01 Electronic Design - Ideas for Design / Among the many measures of good circuit design (e.g., cost, performance, and efficiency), none is more important than reliability. Usually, adequate expected reliability can be achieved by simply sticking to conservative design rules and good. . .
Thermostat Node Schematic
Three Channel Spectrum Analyzer
Transistor Forms RS232C Digital Thermometer:  05/09/96 EDN-Design Ideas
Transistors offer thermal protection for controller:  07/19/2001 EDN - Design Ideas / When a switch-mode power-supply controller, such as On Semiconductor's NCP1200, operates at a high ambient temperature, you should protect the entire power supply against lethal thermal runaway. The NCP1200 operates directly from the power mains without an auxiliary winding; therefore, the die in the IC dissipates power (Figure 1)..
Two Chip Digital Thermometer Delivers 0.4C Accuracy :  07/08/0Two Electronic Design - Ideas for Design / An LED digital thermometer with an operating range between 0C and 150C, 1C resolution, and 0.4C accuracy is presented in the figure. This design is based on the PIC16F872...  
Two-Chip Digital Thermometer Delivers 0.4C Accuracy:  07/08/02 Electronic Design - Ideas for Design / An LED digital thermometer with an operating range between 0C and 150C, 1C resolution, and 0.4C accuracy is presented in the figure. This design is based on the PIC16F872. . .
Universal Programmable Remote
USB Link Neatly Measures temperature:  10/26/00 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit
UV Sensitive Photodetector
Varactor diode stabilizes temperature for FM quadrature demodulator:  06/09/97 Electronic Design - Ideas for Design /  A quadrature detector is used to demodulate frequency shift keying (FSK) and other types of FM signals. The MC13156 shown is an FM subsystem integrated circuit that downconverts the RF to a 10.7-MHz intermediate frequency (IF), amplification, and. . .
Webbased thermometer Project
ΔVBE-Based Cold-Junction Compensator For Thermocouples:  11/06/00 Electronic Design - Ideas for Design / The familiar thermocouple (TC) is probably the oldest species of electronic temperature sensor extant. TCs consist merely of two dissimilar conductors joined at the temperature measuring point. They’re simple to fabricate and look (at first glance)




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