FREQUENCY METER OF ELECTRICAL PULSES BASED ON A PROGRAMMABLE MICROCONTROLLER
Abstract
Modern electronic devices that are used in various fields of science and technology mostly contain inte-grated circuits, which increases the reliability of the device and reduces its cost compared to the use of discrete semi-conductor elements. Besides, reducing the size and weight of the device extends the limits of its practical application. Nowadays the variety of integrated circuits are produced by such companies as Microchip, On Semiconductor, Texas Instrument, Analog Device, Linear Technology and many others that are leaders in the global market. Some of the integrated circuits that can do various functions are microcontrollers. Today the informational and computer technolo-gies are rapidly evolving allowing to create automated production lines, which can be controlled with the help of a computer. One of the nodes that allow connecting the computer to a peripheral device is the microcontroller. To use the microcontroller in the nodes of electronics, it is necessary to write the program code to implement a particular task. Software tuning of the microcontroller parameters allows controlling the function of the corresponding device without changing the parameters of the electrical circuitry, which is an important factor for the reliability of the device as a whole. One possible application of microcontrollers is the automation of a physical experiment, which allows meas-urements of physical quantities and data transmission to a computer. As an example, the optical spectrometry requires a large number of light intensity measurements in the corresponding in the corresponding spectral range with simulta-neous data transfer to a computer. That is, the measurement of light intensity is accompanied by the measurements of the number of light quanta at a certain wavelength per time unit. The circuit of the frequency meter of electric pulses based on the microcontroller PIC16F876A for spectroscopic measurements has been developed and is presented here-in. The scheme of electric pulse frequency meter based on PIC16F876A microcontroller for spectroscopic measure-ments is developed in this work. MPLAB 4.1 environment developed by Microchip was used to write the program code. Two timer0 and timer1 modules of the PIC16F876A microcontroller were used to implement the frequency meter algo-rithm. The Maximum pulse frequency that can be correctly measured with this frequency meter is 4MHz.
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