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Volume 9 Issue 2 - November 2017

  • 1. Solar tracking system using pic16f84a , stepper motor and 555 timer

    Authors : Amey Arvind Madgaonkar, Sumit Dhere, Rupesh Ratnakar Kadam

    Pages : 25-34

    DOI : http://dx.doi.org/10.21172/1.92.06

    Keywords : LDR,PIC16F84A,stepper moter,555 timer

    Abstract :

    Sometimes we come across such a situation where we need to move an object in response to the direction of light. E.g.to track the solar rays to increase the efficiency of power generation through solar panel. Keeping this idea of light direction sensing in the mind, we designed a device which tracks the light source. Today, microcontrollers have become an integral part of all automatic & semi-automatic machines. The architectural changes in instrumentations & control systems were & are due to the computing & communication capability of the microcontroller devices. In this paper, we choose 16F84A which is a microcontroller of PIC (Peripheral Interface Controller) family. It is programmed so as to move the stepper motor which holds the sensors (LDRs) to sense the intense light source and move it accordingly. The exception of the stepper motor is that; it only operates under software control. It needs a specific computer program to complete program to complete its operation. This main requirement of the stepper motor can be overcome by using PIC 16F84A. To sense the light source, we have used a photo sensor i.e. Light Dependent Resistor (LDR). When the LDR gets exposed to the light source, its resistance decreases further that leads to decrease in the voltage across it. This change in the status of LDR is sensed by the IC 555 timer circuit which is an interfacing circuit between LDR and PIC 16F84A. Here, IC 555 timer circuit obtains its input from the LDR and converts it into a digital output signal which serves as an input for PIC 16F84A. According to change in this input signal; PIC 16F84A decides the movement of the stepper motor. But in case, the source is not available then it will rotate the stepper motor in clockwise and anticlockwise direction from its reference position. This operation is called as search mode operation of the device.

    Citing this Journal Article :

    Amey Arvind Madgaonkar, Sumit Dhere, Rupesh Ratnakar Kadam, "Solar tracking system using pic16f84a , stepper motor and 555 timer ", Volume 9 Issue 2 - November 2017, 25-34

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