A temperature is an objective comparative measure of hot or cold. It is measured by a thermometer, Several scales and units exist for measuring temperature, the most common being Celsius (denoted °C; formerly called centigrade), Fahrenheit (denoted °F), and, especially in science, Kelvin (denoted K). Continue reading Arduino Temperature Measurement
The lux (symbol: lx) is the SI unit of luminance, measuring luminous flux per unit area. It is equal to one lumen per square meter. In photometry, this is used as a measure of the intensity, as perceived by the human eye, of light that hits or passes through a surface. Continue reading Arduino Light Intensity Meaurement
Frequency is the number of complete cycles per second in alternating current direction. The standard unit of frequency is the hertz, abbreviated Hz.
Frequency Measurement is carried out by measuring the number of cycles in one second, this method requires time of one second. Other method is to measure time period of one cycle F = 1 / T.
In this example time from first rise to the second rise is measured using interrupt on Pin 2 (INT0). It is set to detect rising pulse and at every 100mSec measured frequency is displayed on serial monitor. Continue reading Frequency Measurement using Arduino
Capacitance is defined as the ability of a body to store an electric charge. The SI unit of capacitance is the farad (symbol: F), named after the English physicist Michael Faraday. A 1 farad capacitor, when charged with 1 coulomb of electrical charge, has a potential difference of 1 volt between its plates. Continue reading Capacitance Measurement using Arduino
The previous voltage divider design is suitable for only measurement of higher values of resistance (50 Ohm to 1 MOhm) to measure very small value resistance we have built this circuit, it consists of constant current source of 100mAmp. Measuring voltage drop across a resistor having constant current gives us resistance value (R = V / I).
Calculations
V = I x R
R = V / I Continue reading Measurement of Low value resistance (0.1 to 50 Ohm)