LED Thermometer


Posted on Feb 6, 2014

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 ca


LED Thermometer
Click here to download the full size of the above Circuit.

n be modified to do so by simply changing the voltage reference to U2 at the sacrifice of precision. You can use any LED you want for D1 - D10, however blue LEDs have a higher voltage requirement so if you want to go blue for a modern look, they may appear more dim then red, yellow or green. By leaving pin 9 of U2 disconnected, the graph will operate in dot mode and R8 should be 100 Ohm. If you build the circuit with pin 9 tied to 9V, the circuit will be in graph mode and R8 should be 15 Ohms. To calibrate the circuit, you will need a voltmeter. Power the circuit up and let it sit for a few minutes for temperature to stabilize. Ground the negative lead of the meter and connect the positive lead to pins 6 and 7 of U2. Set R7 so the meter reads as close to 3. 345V as possible. Now connect the positive lead of the meter to pin 4 of U2 and adjust R5 until the meter reads 2. 545V. Finally, disconnect power to the circuit and remove U1 and U2 from their sockets. Measure the value of R3 with an ohmmeter and remember that value. Connect the ohmmeter across R1 and adjust R1 to a value of exactly 3 times the value of R3. Reinstall U1 and U2 and the circuit is ready for use.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    1.3 Volt Power Source
    RF based Automatic meter reading
    Telephone Line optical and sound Ring
    Power Mosfet Inverter
    300V-pulse-generator
    Electric Furnace Schematic Wiring Diagram
    Old G.P.O. Telephone
    Non-Contact Proximity Switch Circuit
    16 step sequencer schematic
    Controlling the Air Muscle actuators
    LOW NOISE 420 MHz ATV RECEIVER CONVERTER
    Novel FM receiver circuit diagram
    Phase-sensitive rectifier circuit



    Top