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Today I am going to show you how to build a simple temperature sensor using one LM35 Precision Temperature Sensor and Arduino, so you can hookup on your future projects. The circuit will send serial information about the temperature so you can use on your computer, change the code as you will. I’m planning to build a temperature sensor with max/min + clock + LCD, and when I get it done, I will post here. Parts: Arduino (You can use other microcontroller, but then you will need to change the code). LM35 Precision Centigrade Temperature Sensor, you can get from any electronic store. Here is the DATA SHEET. BreadBoard Assembling: This is a quick and simple step. Just connect the 5V output from arduino to the 1st pin of the sensor, ground the 3rd pin and the 2nd one, you connect to the 0 Analog Input. Down goes some pictures that may help you, click to enlarge: Here is the Arduino Code, just upload it and check the Serial Communication Option. You can also download the .pde HERE. /* An...

It is very low-cost and simple electronic circuit project for temperature controller using the LM3911 highly accurate temperature measurement and control system designed in a single monolithic chip. The output voltage of the LM3911 is directly proportional to temperature in degrees Kelvin at 10 mV/degree K. As you can see in this circuit diagram, LM3911 temperature sensor chip require few additional components. Temperature Controller Circuit Diagram:   The resistor network consists of R1, R2, and R3 is used to provide the set point voltage reference for the feedback input of the LM3911. R4 resistor is used to limit the current through the internal voltage reference of the LM3911. R5 resistor pulls the output of the IC high when the temperature is bellow the set point. The internal resistor is in series with a diode that allows a switching voltage up to 35 volts to be used. By modifying the R2 variable potentiometer you will modify the set point of the temperature controller. This s...

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.

Temperature limit of coil Q) To which class of insulating material are the solenoids coils of contactors have to subject? What are their maximum permissible temperatures? ANSWER: The maximum permissible temperature of solenoid coils of contactors is 140 °C. Example: Siemens make 3TF,3TH contactors coil sustain upto 140 degree C. For these coils the maximum permissible temperature rise limit for coils in air according to class of insulating material is E = 100 K. Since this is a temperature rise in Kelvin, this value shall be added with the maximum ambient air temperature of +40 °C of the contactors as described in IEC 60947-4-1. The temperature rise limits applicable only if the ambient air temperature remains within the limits -5 °C to +40 °C. ......

LED based projects require a lot of skill and hence only experienced circuit designers try out these circuits. But there are also a few circuits in this genre that can be done by amateur electronic hobbyists. The temperature candle is one such circuit. Read on to know more about this. The hardware components that are required to build this circuit are listed below: Microcontroller Temperature Sensor RGB LED PCB The circuit design is pretty simple. The LED is made to flicker by the microcontroller and the color is based on the ambient temperature at that point. The temperature of the room can be known by observing the color of the LED. The temperature value is obtained in degree Celsius. This value is received as a result of pressing the reset button on the PCB. This value can also be obtained by providing power to the device. Once the device is powered up, the change in temperature is indicated. The blue LED is triggered for a temperature increase of 10 degrees. The red LED is trig...