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Schematic Circuits

Led Thermomoter With Lm34dz And Lm3914

This LED thermometer is designed for in home use, to read temperatures between about 60 and 78 degrees Fahrenheit. It is based around a precision temperature sensor IC, the LM34DZ. This sensor require no calibration and can measure temperatures of between -50F and +300F. While the circuit shown here does not use the full range of that sensor, it can be modified to do so by simply changing the voltage reference to U2 at the sacrifice of precision.

led thermomoter with LM34DZ LM3914 6AE66.gif

 Parts:

Part Total Qty. De s c r i p t ion
C1 1 1uF 25V Electrolytic Capacitor
C2 1 10uF 25V Electrolytic Capacitor
R1 1 2.2K 1/4W Resistor
R2, R5, R7 3 1K Trim Pot
R3 1 1K 1/4W Resistor
R4 1 1.5K 1/4W Resistor
R6 1 470 Ohm 1/4W Resistor
R8 1 100 Ohm Or 15 Ohm 1/4W Resistor (See Notes)
D1 D10 10 LED
U1 1 LM34DZ Precision Fahrenheit Temperature Sensor
U2 1 LM3914 Bar/Dot Graph Driver IC
MISC 1 Board, Wire, Socket For U1 and U2, Case

Keywords : Led, Thermomoter, With, LM34DZ, And, LM3914
Writer : delon  |
8 Feb 2011 Tue   
|  15.690 Views
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