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.
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  
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