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Learn how wattmeters work by building your own with an Arduino.
Learn more about the usage and properties of the Arduino analog to digital converter.
A DIY lux meter for measuring light intensity with a bandwidth from DC to 350 kHz.
The assumption that multimeters always measure the correct value isn't so obvious as we wish. See here what the issues are
This online signal generator can generate waveforms with your browser that can also be made audible.
Signal can be very diverse formed. Learn how this particular signal characteristics are defined.