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Sensors / Detectors: Temperature Sensors

Temperature Sensors:      #'s - A      B - G      H - L      M - Q      R - S      T - Z


Sensors / Detectors -- Main Page


Last Updated: October 24, 2017 02:55 PM

Circuits Designed by Dave Johnson, P.E. :

Thermocouple Temperature Activates Relay -  Voltage from a high temperature thermocouple activates a relay when the sensor detects a temperature above 1000 degrees F. . . Circuit by Dave Johnson P.E.-July, 2006

Thermostat for 12v Cooling Fan -  This circuit will turn on a 12v DC powered cooling fan when the air temperature reaches a certain high temperature and will keep the fan turned on until the temperature drops below a second lower level.  Both the high and low temperatures are both adjustable . . . Hobby Circuit designed by David Johnson P.E.-February, 2011

Capacitance Proximity Switch
Draws very low power - Ideal for battery-powered applications
6 Models Available - Call 806-368-7747


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

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 __ Circuit Design by Daniel Segarra, Sipex Corp  Billerica, MA

Thermocouple Measurement -  Linear Technology AN28 __ Designed by Jim Williams - Feb 1st, 1988

Thermocouple Measurement -  AN28 Considerations for thermocouple-based temperature measurement are discussed.  A tutorial on temperature sensors summarizes performance of various types, establishing a perspective on thermocouples.  Thermocouples are then focused on.  included are sections covering cold-junction compensation, amplifier selection, d__ Linear Technology/Analog Devices

Thermocouple Temperature Activates Relay -  Voltage from a high temperature thermocouple activates a relay when the sensor detects a temperature above 1000 degrees F. . . Circuit by Dave Johnson P.E.-July, 2006

Thermocouple Temperature Measurement System with Amplifier-Based Cold Junction Compensation  -  The EVAL-CN0271-SDPZ contains the circuit to be evaluated, as described in this note, and the SDP-B controller board is used with the CN-0271 evaluation software to capture the data from the EVAL-CN0271-SDPZ circuit board.  Equipment Needed The following equipment is needed:, Bullet text, Getting Started Load the evaluation software by placing the CN-0271 evaluation software CD in the CD drive of the PC.  Using My Computer, locate the drive that contains the evaluation software.  , Functional Block Diagram See Figure 1 of this circuit note for the circuit block diagram and the EVAL-CN0271-SDPZ-SCH-RevA.  pdf file for t__ Analog Devices from the Lab

Thermocouple Temperature Measurement System with Less Than 500 μA Current Drain  -  For this reason, a linearization procedure is implemented in the CN0206-SDP-0 LabViEW software.  The evaluation software then searches the modified look-up table for the thermocouple input voltage, as sampled by the AD7793 System Calibration in addition to linearizing the thermocouple temperature, the evaluation software performs a two-point calibration.  __ Analog Devices from the Lab

Thermocouple Thermometer with Cold Junction Compensation -  The LTC2997 is a high-accuracy analog output temperature sensor. __ Linear Technology/Analog Devices App Note, Jul 7th 2011

Thermocoupler -  Uses a 16F84 to read a thermocouple via a Maxim's Max6674__ 

Thermoelectric Cooler Temperature Controller for Fiber Optic Lasers -  AN89 Linear Technology This App Note presents circuitry for maintaining 0.01°C temperature control of fiber optic lasers over wide ambient range variations.  The circuitry also features high efficiency power delivery, compact size and low noise.  Detailed descriptions of circuitry and results are given with special emphasis on rmal loop optimization.  An appended__ Linear Technology/Analog Devices

Thermoelectric cooler unipolar drive achieves stable temperatures -  3-Dec-07 EDN Design Ideas:  Depending on the direction of current flow, Peltier devices can both heat and cool __ Circuit Design by W Stephen Woodward, Chapel Hill, NC

Thermoelectric Generator to 2.4V Super Capacitor Charger -  The LTC3105 is a high efficiency step-up DC/DC converter that can operate from input voltages as low as 200mV.  A 250mV start-up capability and integrated maximum power point controller (MPPC) enable operation directly from low voltage, high impedance alternative power sources such as photovoltaic cells, TEGs (thermoelectric__ Linear Technology/Analog Devices App Note, Oct 26th 2010

Thermometer & thermostat -  for Room temperatures __ Designed by Richard Torrens

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 __ Designed by Published in Elecktor July/Aug, 2010

Thermometer-Thermostat -  This is a simple thermostat that I designed to use with my central heating system.  When is not in use acts like a thermometer.  The prototype uses the AT90S2313 but it’s obsolete now, so I changed it with the pin to pin compatible ATtiny2313 (the photo shows my first prototype).  __ AVR Projects Dim

Thermostat -  OK - so I admit is.  This circuit is the same as the last one!  Here is a practical use for the Schmidt trigger.   __ Designed by Richard Torrens

Thermostat  (1N4148) -  Temperature controlled fan with diode temp sensor.  This circuit controls very accurately a fan of any size.  Just adjust the associated resistors for a different type like the R6 resistor of 100 ohm, 2 watt type and you’re all set.  The above circuit diagram is for a small 12 volt fan, the size and type determined by the user. __ Designed by Tonny Von Roon

Thermostat Control for Electric Heaters -  One Advantage of these two units is the Sensor can be placed Away from the heater, therefore sensing the Actual Room temperature, not the direct heat from the heater.  These can also be used in a confined space with a Heat Lamp, to create a Drying Oven  __ Designed by G.L. Chemelec

Thermostat for 12v Cooling Fan -  This circuit will turn on a 12v DC powered cooling fan when the air temperature reaches a certain high temperature and will keep the fan turned on until the temperature drops below a second lower level.  Both the high and low temperatures are both adjustable . . . Hobby Circuit designed by David Johnson P.E.-February, 2011

Thermostat for 1KW Space Heater (SCR controlled) -  Below is a thermostat circuit I recently built to control a 1300 watt space heater.  The heater element (not shown) is connected in series with two back to back 16 amp SCRs (not shown) which are controlled with a small pulse transformer.  The pulse transformer has 3 identical windings, two of which are used to supply trigger pulses to the SCRs, and the third winding is connected to a PNP transistor pair that alternately supply pulses to the transformer at the beginning of each AC half cycle.  The trigger pulses are applied to both SCRs near the beginning of each AC half cycle but only one conducts depending on the AC polarity. __ Designed by Bill Bowden

Thermostat Node Schematic -  Circuit Only __ Designed by Ed Cheung

Thermostat with Adjustable Hysteresis -  Switching Circuits:  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.  __ Designed 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 PIC 18F1320 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/DS18x20 "1-Wire" sensor.   __ Designed by D. Thorpe, 2006

Transistor Forms RS-232C 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 __ Circuit Design by WS Woodward, University of North Carolina—Chapel Hill

Transistor junction monitors remote temperature -  06/22/00 EDN Design Ideas:  The circuit in Figure 1 uses a regular, general-purpose transistor as the sensing element and a thermal-diode monitor IC to measure temperature.  The ADM1021 usually connects to an on-chip thermal diode on a CPU die itself, but in this application the sensor connects to a regulator low-cost discrete npn transistor, the 2N3904 __ Circuit Design by Matt Smith, Analog Devices, Limerick, Ireland

Transistor junctions monitor temperature zones -  12/31/69 EDN Design Ideas:   A simple circuit uses transistor junctions to monitor multiple temperature zones.  The temperature sensors are ordinary, general-purpose, low-cost, diode-connected transistors.  The well-known diode equation VBE = (kT/q) 'ln (IC  /iS) shows that there is a temperature dependency of approximately 2.2 mV/°C for a base-emitter junction.   __ Circuit Design by Matt Smith, Analog Devices, Limerick, Ireland

Transistors offer thermal protection for controller -  07/19/01 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)  __ Circuit Design by Christopher Basso, On Semiconductor, Toulouse, France

Two-Terminal Temperature-to-Current Thermometer Suitable for Use at the End of Long Wire Runs -  Adding the LT3092 to a thermistor kit along with three 0.1% accuracy resistors and one final trim, a very accurate 2-terminal temperature-to-current converter can be built.  This circuit measures 700μA operating current at 0°C, dropping by 2μA every degree until 100°C, at which point the current measures 500μA.  The obvious__ Linear Technology/Analog Devices App Note, Oct 26th 2010

Type K Thermocouple Signal Conditioner with ±190V Protection from Accidental Contact & Cold Junction Compensation -  Thermocouple wires are intended to be electrically floating in order to detect temperature by producing the Seebeck voltage created by two dissimilar metals.  This small voltage is amplified to an easily measurable level by an amplifier.  To protect the input terminals of the amplifier in the event that the thermocouple is shorted __ Linear Technology/Analog Devices App Notes, Mar 16th 2010

Type K Thermocouple Signal Conditioner with ±350V Protection from Accidental Contact & Cold Junction Compensation -  A high input impedance amplifier permits the use of large valued input resistors and retains signal accuracy.  This is very useful for protecting both the amplifier and cold junction compensator in thermocouple applications as the sense element can often be inadvertently connected to destructive voltage potentials.  The 1MΩ __ Linear Technology/Analog Devices App Notes, Mar 16th 2010

Ultraprecise Instrumentation Amplifier Makes Robust Thermocouple Interface -  DN302 Design Notes__ Linear Technology/Analog Devices

USB 2.0 temperature sensor needs only a handful of parts -  05/24/07  EDN Design Ideas:  A USB-to-serial converter forms the heart of an accurate USB temperature sensor __ Circuit Design by Silvio Lauckner, Ismaning, Germany

USB Based Temperature Monitor using the ADuC7120 Precision Analog Microcontroller & an External Thermistor  -  Circuit linearization techniques can be accomplished in software; however, that will not be discussed here.  , Despite the powerful ARM7 core and high speed SAR ADCs, the ADuC7122 still provides a low power solution__ Analog Devices from the Lab

USB link neatly measures temperature -  26-Oct-00 EDN Design Ideas:  Figure 1 shows a convenient and neat way to measure temperature using the USB of a PC.  An ADM1023 IC senses the temperature, and an Anchor Chips EZ-USB.   PDF contains several circuits, scroll to find this one.    __ Circuit Design by Mary Burke, Analog Devices, Limerick, Ireland

USB-Based Thermocouple Temperature Measurement System using ARM7  -  in the source code, an ADC sampling rate of 4 Hz is chosen.  When the ADC input PGA is configured for a gain of 32, the noise free code resolution of the ADuC7060/ADuC7061 is greater than 18 bits.  , Circuit Function and Benefits, The following features of the ADuC7060/ADuC7061 are used in this application:, Primary 24-bit Σ-Δ ADC with programmable gain amplifier (PGA) : The PGA is set for a gain of 32 in the software for this application.  ARM7TDMi® core: The powerful 16-/32-bit ARM7 core with integrated 32 kB flash and SRAM memory runs the user code that configures and controls the ADC, processes the ADC conversions from the RTD, and controls the communications over the UART/USB interface__ Analog Devices from the Lab

USB-Based, Thermocouple Temperature Measurement System using ARM Cortex-M3  -  in the source code, an ADC sampling rate of 4 Hz is chosen.  When the ADC input programmable gain amplifier (PGA) is configured for a gain of 32, the noise-free code resolution of the ADuCM360/ ADuCM361 is greater than 18 bits.  , Circuit Function and Benefits, The following features of the ADuCM360/ADuCM361 are used in this application: , A 24-bit Σ-Δ ADC with a PGA set for a gain of 32 in the software for the thermocouple and RTD__ Analog Devices from the Lab

Use Thermoelectric Coolers with Real-World Heat Sinks -  04/17/08  EDN Design Ideas:  When using a Peltier thermoelectric cooler with a less-than-perfect heat sink, you must derate the maximum voltage and current applied to the cooler __ Circuit Design by W Stephen Woodward, Chapel Hill, NC

Use Thermostat as 12 Volt Timer -  Find out how an old battery powered thermostat can be used as a low voltage automatic timer.   __ Designed by REUK-Renewable Energy UK website

Weller WLC100 Electronic Soldering Station -  One day you switch on your soldering station (in my case a Weller WLC100).  You flick the switch and the red light comes "ON", indication power is okay.  Ten minutes later you get ready to solder and find the soldering pencil is not hot at all.  What the?!  After the usual frustration period of confusion and bad words you decide to investigate and fix the problem.  After all, you are a techie or technical inclined and you can 'fix anything'.  Right?.   __ Designed by Tony van Roon  VA3AVR

Wet Bulb Psychrometer -  The LTC2990 is used to monitor system temperatures, voltages and currents.__ Linear Technology/Analog Devices App Note, Oct 26th 2010

Wind Direction & AirFlow Measurement -  The LTC2990 is used to monitor system temperatures, voltages and currents.  Through the i2C serial interface, the device can be configured to measure many combinations of internal temperature, remote temperature, remote voltage, remote current and internal VCC.  The internal 10ppm/°C reference minimizes the number of supporting __ Linear Technology/Analog Devices App Note, Mar 16th 2011

Wireless Digital Thermometer for Multiple Sensors -  A lot of remote sensing thermometers have a problem with measuring more than one temperature at a time. To overcome this problem, a different technique is adopted here, which allows you to...__ Electronics Projects for You

Wireless Temperature & Humidity Sensor with USB -  this project is based on obdev's Remote Sensor example and their firmware-only USB implementation; the main change is the replacement of the analog sensors with a Sensirion SHT11 digital temperature and humidity sensor__ 

Wireless Temperature Monitor Has Data-Logging Capabilities -  01/19/12  EDN Design Ideas:  You can make a wireless temps system with two IC s.  You can use a local temperature sensor and an ASK (amplitude-shift-keying) transmitter/receiver pair to design a simple wireless temperature-monitoring system with data-logging capabilities.  A microcontroller processes and displays the temperature reading to the user.  The microcontroller’s onboard UART (universal asynchronous receiver/transmitter) also allows for data-logging applications __ Circuit Design by Tom Au-Yeung and Wilson Tang, Maxim Integrated Products, Sunnyvale, CA

Wireless Weather Station. Part 1 -  in the Midwest, the main topics of conversation may include the local football team or how the crops are doing.  inevitably though, the conversation always leads to the weather.  Most of us take the weather for granted __ Designed by Jerry Wasinger

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Temperature Sensors:      #'s - A      B - G      H - L      M - Q      R - S      T - Z

 


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