Circuit of Simple Temperature Detector

This is an explanation about circuit of simple temperature detector. In many ways, the development of science and technology is getting easier for human activities (especially those who are ready to receive it), the various creations of human creativity in any variety of small things to things that are not small.


create excessive heat detection circuit of an object (could be: water, body temperature, etc.) using a very simple circuit.

This Image of Simplified Circuit Temperature Detector

The circuit consists of:

Temperature sensor (thermistor or the like)
potentiometer 10 K
741 Op Amp
resistor
output: Bi Color Led

Explanation The Circuit

as an automatic switch we use a voltage divider between the thermistor and potentiometer (to set accuracy) and the incoming voltage from the voltage divider had entered the LM 741 op amp and output from the LED will change color automatically.
note: the output can be replaced by buzzer

when heat temperature

when cold temperatures

Thats the circuit of simple temperature detector , this circuit can be used to detect your health, good healthy living ( vida sana ).

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BC550 High Temperature ALARM

The circuit is small regulatorof temperature, us warns for the increase of temperature. The control of temperature becomes from the thermistor TH1, that is negative factor. His resistance is altered between in the 10K in temperature 25° C and roughly in the 1K in their 94° C. The trimmer TR1 regulates the precise temperature in which the Q1-2, connected as darlington, conduct, making him relay K1 close also the buzzer BZ, sound. The alarm is activated when the temperature becomes bigger than predetermining. The thermistor it should he is placed far from the remainder circuit, in order that this is not in danger from the temperature.

The supply of circuit becomes from battery 9V, but if he is placed in constant place, then we can him supply with one power supply . In the contacts of relay we can connect what load we want, as a lamb, other circuit k.a. Also can is added a LED, if we want to have also optical clue of excitation. The regulation becomes sinking him thermistor TH1, in water which we know the temperature of (the contacts should are well insulate so that do not have short-circuit) and regulating him trimmer, until excited the circuit. The cable that we connect the circuit with the TH1, should be plate.

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Simple Radiator Temperature Iindicator

This radiator temperature indicator can be designed using electronic schema diagram bellow .Temperature indicator consists of two special zener diode, D1 and D2, connected in series to ensure accuracy of 5.96 V Zener voltage at 25 ° C. As long as the radiator temperature not exceeding 50 ° C, thermal indicator will flash a green LED, one orange will be provided for temperatures of 50 ... 75 ° C and a red LED, for temperatures above 75 ° C.

Simple Radiator Temperature Iindicator  Circuit Diagram

Zener voltage will increase by 20 mV for each temperature increase of a degree Celsius temperature. Radiator temperature corresponding voltage level is compared with two reference voltages, IC1 and IC2 using. When the temperature reaches 50 ° C, IC2s output goes to logic state "1" so that T3 leads and following ignition with diode D4. At 75 ° C, IC1s output is in logic state "1" and, therefore, T2 and T3 will, so that D3 and D4 lights are off. 

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Temperature and Humidity Sensor

Temperature and humidity sensors used are SHT75. This sensor is a chip that can measure temperature and humidity as well. The use of these sensors with consideration of its small size and reliability. The output of this sensor has the form of digital data in the chip because it has been there for a 14bit ADC.



Temperature measurement range between -40-123,8 º C and humidity between 0-100% Rh. Measurement accuracy reaches ± 0.3 per increase of 25 º C for temperature and ± 1.8% RH for humidity.

Temperature and humidity sensor

The default measurement resolution of this sensor is 14 bits to 12 bits and temperature sensors for humidity sensors, can also use only 12 bit resolution and 8 bits.

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Temperature controlled fan Circuit diagram

This is temperature controlled fan schema.When you use this schema you dont want to turn the switches when the heat goes up.It is controlled automatically.





Note

# R1 =thermistor (15K @ 20°C ,N.T.C thermistor )

# C1 must be rated 25V.

# This schema is operated with 12V power supply

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Temperature Regulator Circuit with TIP122 Wiring diagram Schematic

For best efficiency,make good thermal contact between the 40 ohm resistor,the TIP 122,the 3 diodes and the temperature controlled entity , the components all give off heat. We have some minor changes to the draft Roy. Roy A 4.7V zener is used in its original design and a resistor network, a range of operating temperatures of 188 degrees Kelvin to 243 Kelvin degrees C or -85 to -30 C.

Temperature Regulator Circuit with TIP122

This is fine in Cryocam Roy, but I’m afraid that many of our camera cookbook may not be able to reach a maximum temperature of Roy. That and the fact that related to the Zener 4.7V difficult to replace me with Roy Z 5.1V zener with more accessible. This diode is available off the shelf at Radio Shack. I supply the resistor network on a range of 190 K to 270 K or -83 C to -3 C I believe that most of our cameras can be maintained to -3 C and I doubt that all our cameras in a position are to be attained – 83 C, so I think that this area should be good enough coverage. I chose to use a 100k pot at some point, because I’m going to the plate with a dual digital potentiometer DS1267 replace. I do not allow for a distance, using Win245 software controllable temperature control and the 100K pot is the control loop is working is to be updated very easily. I intend to use the pot on the remaining DS1267 to replace R43 on the board pre-amp. This allows a selectable gain control software for the camera cookbook. More later.

I would recommend the maximum TEC voltage regulator and leave it there. The schema temperature controller does the rest. You may want to perform delete on the part of the adjustment of supply voltage and tie the totally positive TEC voltage directly at the outlet of the resistors R1 and R2 in parallel with power supply stocks cookbook. There is much room is available for experiment. Roy says that his power TEC does not need to precisely controlled tension, but also be filtered and have less than 10% ripple. So, I think you no harm by not following the proportion of the supply voltage regulation will do Peltier.

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