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.
Part
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Total Qty. Description Substitutions
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
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