Module thermometer temperature meter for digital multimeter using the ic lm35

  
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Converser of temperature tension. To be used with a digital multimeter with reach from -40 °C to 110 °C. With checker of the state of it laughed and a without any adjustment, thanks to LM35! The ice is founded the 0 °C and the point of ebullition of the water, at sea level it is of 100 °C. Using those two point of reference is gauged the temperatu
Module thermometer temperature meter for digital multimeter using the ic lm35 - schematic

re scale quickly. When I speak to °C it is degrees Celsius and not centigrade as we can see in some literatures. Centigrade it is a scale of 100. While temperature is going besides 100. Then the correct is to speak degrees Celsius! Good it arrives of blG blG Today thanks to the circuit integrated specialized of National Semiconductor, denominated LM35, we didn`t need of nor a calibration to obtain the correct temperature. For the circuit we needed a battery of 9v and of a tension of negative feeding. Obtained according to the datasheet of LM35 by the Diodes D2 and D3. The resistor R5 allows the tension of exit of the sensor to be negative in relation to mass of the multimeter so that she can measure resistances below 0 °C. The resistor R4 desaclop the exit of the probe in relation to exit of high impedance of the multimeter. The circuit based on the transistor Q1 serves as device of control of the feeding tension and of proof of the state of the battery. When closing the key S1, The led will light informing that the tension of the battery is above 7V, that is necessary for the correct operation of the circuit. LM35 should be set up in a metallic tube from about 5 to 10 CM, linked to the main circuit through a cable trifler of at the most 1 m of length. The tube should be closed tightly on the two sides to allow the measure of liquids. it/you appeases main and the battery should be placed in a box of plastic small. The plate...



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