/*

 * Author: Pratesh Kumar Reddy <rpratesh@gmail.com>
 * Copyright: Free to use with attributes
/
/*This code will read the analog sensor values from the four analog i/o pins and based up on that it will take decision on park lot occupancy.Then it will write the data onto a file "parklot1.txt" with the following data packet format
  (mother_id)$(sensor_id)$(sensor_stat)$(analog_input_value)*/

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "mraa.h"
int mother_id=1,sensor_id,sensor_stat[4];
uint16_t adc_value[4],threshold=1500;
int i;
FILE *fp;

int main ()
{
	mraa_aio_context aio0,aio1,aio2,aio3;
	aio0=mraa_aio_init(0);
	aio1=mraa_aio_init(1);
	aio2=mraa_aio_init(2);
	aio3=mraa_aio_init(3);

  
  
	    fp =fopen("/iot/parklot1.txt","w");
		adc_value[0]=mraa_aio_read(aio0);
		//printf("%d",adc_value[0]);
		adc_value[1]=mraa_aio_read(aio1);
		//printf("%d",adc_value[1]);
		adc_value[2]=mraa_aio_read(aio2);
		//printf("%d",adc_value[2]);
		adc_value[3]=mraa_aio_read(aio3);
		//printf("%d",adc_value[3]);
for(i=0;i<3;i++)
		{
			if(adc_value[i] < threshold && sensor_stat[i] ==0)
			{
			   
			   sensor_stat[i]=1;
			}
			else if(adc_value[i] > threshold && sensor_stat[i] ==1)
			{
			   sensor_stat[i]=0;
	           
			}
		}

		fprintf(fp,"%d$%d$%d$%d\n",mother_id,0,sensor_stat[0],adc_value[0]);
		fprintf(fp,"%d$%d$%d$%d\n",mother_id,1,sensor_stat[1],adc_value[1]);
		fprintf(fp,"%d$%d$%d$%d\n",mother_id,2,sensor_stat[2],adc_value[2]);
		fprintf(fp,"%d$%d$%d$%d\n",mother_id,3,sensor_stat[3],adc_value[3]);

  
  fclose(fp);
  return 0;
}