File content as of revision 10:e4b6bc6d9b07:

/**
Electronically Controlled Intelligent Shelves
Developed by: Priyank Kalgaonkar
**/

#include "mbed.h"
#include "hcsr04.h"
#include "ESP8266.h"
#include "math.h"
#define CloudIP "184.106.153.149"           //Raw IP Address of ThingSpeak Cloud Server

DigitalOut RLed(LED1);                      //Onboard Red LED = Shelf Out of Stock
DigitalOut GLed(LED2);                      //Onboard Green LED = All OK
DigitalOut BLed(LED3);                      //Onboard Blue LED for Wifi Tx Indication
HCSR04 usensor1(D8,D9);                     //ECHO Pin=D9, TRIG Pin=D8
HCSR04 usensor2(D7,D6);                     //ECHO Pin=D7, TRIG Pin=D6
Serial pc(USBTX,USBRX);                     //Serial Communication with PC
ESP8266 wifi(PTC17, PTC16, 115200);         //Tx Pin:PTC17; Rx Pin:PTC17; Baud rate:115200

void wifi_send(void);;                      //Connect and Push Data Channel to Cloud Server

int num = 0;
int distance1, distance2;
float dist_remaining1, dist_percent1, dist_remaining2, dist_percent2;
char snd[255],rcv[1000];                    //snd: send command to ESP8266
                                            //rcv: receive response from ESP8266

int main()
{
    pc.baud(115200);                        //Baud Rate of 115200 for Tera Term
    
    pc.printf("########  ######  ####  ######      ######  ##    ##  ######  ######## ######## ##     ##\n\r");
    pc.printf("##       ##    ##  ##  ##    ##    ##    ##  ##  ##  ##    ##    ##    ##       ###   ###\n\r");
    pc.printf("##       ##        ##  ##          ##         ####   ##          ##    ##       #### ####\n\r");
    pc.printf("######   ##        ##   ######      ######     ##     ######     ##    ######   ## ### ##\n\r");
    pc.printf("##       ##        ##        ##          ##    ##          ##    ##    ##       ##     ##\n\r");
    pc.printf("##       ##    ##  ##  ##    ##    ##    ##    ##    ##    ##    ##    ##       ##     ##\n\r");
    pc.printf("########  ######  ####  ######      ######     ##     ######     ##    ######## ##     ##\n\r");
    pc.printf("-----------------------------------------------------------------------------------------\n\r");
    pc.printf("Developed By: Priyank Kalgaonkar\n\r");
    pc.printf("-----------------------------------------------------------------------------------------\n\r\n\r");
    
    pc.printf("Initial Setup\r\n");
    wifi.SetMode(1);                        //Set ESP mode to 1
    wifi.RcvReply(rcv, 1000);               //Receive a response from ESP
    pc.printf("%s\r", rcv);

    pc.printf("Connecting to WiFi\r\n");    //AP Setup Initialization
    wifi.Join("Z", "12345678");//Put your Wifi SSID followed by Password WiFi_SSID WiFi_Password
    wifi.RcvReply(rcv, 1000);
    pc.printf("%s\n", rcv);
    wait(8);
    
    wifi.GetIP(rcv);                        //Obtains an IP address from the AP
    
    while (1) 
    {
        wifi_send();
        
        RLed = 1;
        GLed = 1;
        BLed = 0;
        wait(2.0f);
    }
}

void wifi_send(void)
{
    while(num<1000000000000)
    {
        num=num+1;
        pc.printf("\nCloud Sync Instance #: %d\n\r", num);
        pc.printf("Syncing Data with Cloud, Please Wait.\n\r");
        
    //Ultrasound Sensor (HC-SR04) #1 Initialization
        int a = 30;
        usensor1.start();
        wait_ms(500);
        
    //Calculating Distance Percentage Remaining for Sensor # 1
        distance1 = usensor1.get_dist_cm();
        dist_remaining1 = a-distance1;
        dist_percent1 = (dist_remaining1/30)*100;
        
    //LED and Tera Term Output
        if (distance1<30 && distance2<30) {
            RLed = 1;
            BLed = 1;
            GLed = 0;
            //printf("Percent remaining: %f\r", dist_percent1 && dist_percent2);
        } else {
            GLed = 1;
            BLed = 1;
            RLed = 0;
            printf("Shelves Empty! Replenish Stock.\n\r");
        }    
        
    //Sending Data to the Cloud Server via ESP8266 WiFi Module
        strcpy(snd,"AT+CIPMUX=0\n\r");        //AT+CIPMUX: Enabling Single Channel Mode
        wifi.SendCMD(snd);
        wait(1);
        wifi.RcvReply(rcv, 1000);
        wait(1);
        
    //Establish TCP connection w/ Cloud Server
        sprintf(snd,"AT+CIPSTART=4,\"TCP\",\"%s\",80\n",CloudIP);
        wait(1);
        wifi.RcvReply(rcv, 1000);
        wait(1);
        
    //Set length of the data that will be sent
        strcpy(snd,"AT+CIPSEND=100\n\r");
        wifi.SendCMD(snd);
        pc.printf("%s\r", rcv);
        wait(1);
        wifi.RcvReply(rcv, 1000);
        pc.printf("%s\r", rcv);
        wait(1);
        
    //Pushing the data acquired from HC-SR04 Ultrasonic Sensor to Cloud Server via API
        pc.printf("Product X - Sensor 1: \n\r");
        sprintf(snd,"\rhttps://api.thingspeak.com/update?api_key=O59NSRSQZCJ2G6WK&field1=%f\r", dist_percent1);
        printf("Percent Stock X Remaining: %f\n\r", dist_percent1);
        wifi.SendCMD(snd);
        pc.printf("%s\r",snd);
        wait(0.5);
        wifi.RcvReply(rcv, 1000);
        pc.printf("%s\r", rcv);     
    }
}