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Main » Tests and Measurement
 High resolution capacitance meter measures in 0.01pF digits. Total range 0pF to 50uF.
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 I like to see lights move to music. This project will indicate the volume level of the audio going to your speakers by lighting up LEDS. The LEDS can be any color so mix them up and really make it look good.
The input of the circuit is connected to the speaker output of your audio amplifier. You want to build two identical units to indicate both right and left channels. The input signal level is adjusted by the 10k ohm VR. If you wish to make a very large scale model of this unit and hang it on your wall there is an optional output transistor that can drive many LEDS at once. The unit I built drove three LEDS for each output. The sequence of the LEDS lighting are as follows Pin 1, 18, 17, 16, 15, 14, 13, 12, 11, 10.<
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 As shown in the schematic, temperature sensor of our electronic thermometer is LM35DZ. There are some kinds of LM35 IC, since it is cheap and easy to find we used LM35DZ in our project. It measures from 0°C to 100°C with a very linear output graph.For one degree change, it increases its output 10mV.
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 This temperature monitor has been constructed using mbed microcontroller, DS1620 IC, NTP, and ThingSpeak website.
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 This electronic lie detector circuit will give two readings: one for difficult questions for the subject and another to show its emotional state in general.
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