Introduction: Solar Tracking Device Using Msp430

By vignesh raja

HI everyone.here i am showing my solar tracking project for solar panel. The two LDRs are connected to both edges of the solar panel.so it can able to follow sun direction from east side sunrise to until west side sun set. this project find more light intensity area so it help the solar panel to produce maximum power. the two LDRs analog signal are converted into digital signal in MSP430G2231. the converted values are compared continuously in MSP430G2231 and correspondingly which LDR value is higher that side solar panel will turn. let us see the circuit diagram and programming code for this project.

Step 1: Circuit Diagram

here is the circuit diagram of the project. in the circuit diagram you can see that there is 10 k potentiometer . they are used to adjust and calibrate the ldr value . adjust two pods until the both ldr value get equal. for that connect the circuit and program the ic then do adjust it.

Step 2: Coding :

i did the coding for this project using code composer studio software. here i present the coding for msp430g2231.

#include "msp430.h"

#define ADC_CHANNELS 2

unsigned int samples[ADC_CHANNELS];

#define LED1 BIT4

#define LED2 BIT6

#define SENSOR_LEFT BIT0

#define SENSOR_GND BIT2

#define SENSOR_RIGHT BIT1

#define SENSOR_GND1 BIT3

#define RED_LED LED1

#define GRN_LED LED2

void ConfigureAdc(void){

ADC10CTL1 = INCH_1 | ADC10DIV_0 | CONSEQ_3 | SHS_0;

ADC10CTL0 = SREF_0 | ADC10SHT_2 | MSC | ADC10ON | ADC10IE;

ADC10AE0 =SENSOR_LEFT + SENSOR_RIGHT ;

ADC10DTC1 = ADC_CHANNELS;

}

void main(void) {

WDTCTL = WDTPW | WDTHOLD;

BCSCTL1 = CALBC1_1MHZ;

DCOCTL = CALDCO_1MHZ;

BCSCTL2 &= ~(DIVS_3);

P1DIR = 0; /* set as inputs */

P1SEL = 0; /* set as digital I/Os */

P1OUT = 0; /* set resistors as pull-downs */

P1REN = 0xFF; /* enable pull-down resistors */

P2DIR = 0; /* set as inputs */

P2SEL = 0; /* set as digital I/Os */

P2OUT = 0; /* set resistors as pull-downs */

P2REN = 0xFF; /* enable pull-down resistors */

P1REN &= ~(LED1 | LED2); /* disable pull-up/downs */

P1DIR |= (LED1 | LED2); /* configure as oututs */

P1REN &= ~(SENSOR_GND |SENSOR_GND1); /* disable pull-up/down */

P1OUT &= ~(SENSOR_GND|SENSOR_GND); /* SENSOR_GND should be at GND */

P1DIR |= (SENSOR_GND |SENSOR_GND1); /* SENSOR_GND must be an output */

P1REN |= (SENSOR_LEFT|SENSOR_RIGHT); /* enable pull-up on SENSOR */

P1IN |= (SENSOR_LEFT|SENSOR_RIGHT); /* set resistor as pull-up */

ConfigureAdc();

__enable_interrupt();

while (1) {

__delay_cycles(1000);

ADC10CTL0 &= ~ENC;

while (ADC10CTL1 & BUSY);

ADC10SA = (unsigned int)samples;

ADC10CTL0 |= ENC + ADC10SC;

__bis_SR_register(CPUOFF + GIE);

if (samples[0] < samples[1]) {

P1OUT |=RED_LED;

P1OUT &= ~(GRN_LED);

} else if (samples[0] == samples[1]) {

P1OUT &= ~(RED_LED);

P1OUT &= ~(GRN_LED);

} else {

P1OUT |= GRN_LED;

P1OUT &= ~(RED_LED);

}

}

}

#pragma vector=ADC10_VECTOR

__interrupt void ADC10_ISR (void){

__bic_SR_register_on_exit(CPUOFF);

}

thank you for watching