main.cpp

00001 #include "mbed.h"
00002 #include "mbed.h"
00003 #include "hcsr04.h"
00004 #include "ESP8266.h"
00005 
00006 #define APIKEY QSL7YVXB73QHN2EK   //Put "Write key" of your channel in thingspeak.com 
00007 #define IP "184.106.153.149"       // IP Address of "api.thingspeak.com\"
00008 const char *WIFI_SSID = "ssid"; // Enter your Wi-Fi name 
00009 const char *WIFI_PASS = "password" ; // Enter your Wi-Fi password
00010 //#define WIFI_SSID "ssid"
00011 //#define WIFI_PASS "password"
00012 HCSR04  usensor(PTC12,PTC4);
00013 DigitalOut trigger(PTC12);
00014 DigitalOut RED(LED1); //monitor trigger
00015 DigitalOut GREEN(LED2); //monitor echo
00016 InterruptIn echo(PTC4);
00017 
00018 
00019 Serial pc (USBTX, USBRX); //Serial Communication
00020 ESP8266 wifi (PTC17, PTC16, 115200); //Setting baud rate for Wifi Esp Module
00021 char snd[255], rcv[1000];
00022 #define IP "184.106.153.149"//IP address of thingspeak.com
00023 unsigned int pulsedur;
00024 
00025 Timer pulsetime;
00026 
00027 void wifi_send(void);
00028 int main()
00029 {
00030 unsigned int distance;
00031 pc.baud(115200);
00032 //Initializing Wi-Fi
00033 pc.printf("SET mode to AP\r\n");
00034 wifi.SetMode(1); //set the mode of ESP to 1
00035 wifi.RcvReply(rcv,1000); //receive response by ESP
00036 pc.printf("%s",rcv); //print the response
00037 pc.printf("Connect to the Wifi\r\n"); //wifi name & password
00038 wifi.Join("WIFI_SSID","WIFI_PASS");
00039 wifi.RcvReply(rcv, 1000); //receive response by ESP
00040 pc.printf("%s\n",rcv); //print the response
00041 wait(8); //waiting for the response from ESP
00042 pc.printf("Getting IP\r\n"); //getting the IP address from the connected AP
00043 wifi.GetIP(rcv); //IP address received from AP
00044 pc.printf("%s\n",rcv); //print response on TeraTerm
00045 pc.printf("Initializing the Wi-Fi\r\n");
00046 
00047 
00048 //Loop to read distance, scale and print 
00049 while(1)
00050 {
00051 trigger=1;
00052 RED=1;
00053 GREEN=0;
00054 pulsetime.reset();
00055 wait_us(10);
00056 trigger=0;
00057 RED=0;
00058 while(echo==0){};
00059 GREEN=echo;
00060 pulsetime.start();
00061 while(echo==1){};
00062 pulsetime.stop();
00063 pulsedur = pulsetime.read_us();
00064 distance= (pulsedur*343)/20000;
00065 GREEN=0;
00066 pc.printf("Distance is %d cm\n\r" ,distance);
00067 pc.printf("Uploading status to the cloud\n\r");
00068 //wait before sending another ping since echo(s) may return
00069 wait(10);
00070 wifi_send();
00071    };
00072 }
00073 //End of main program
00074 //Routing data to cloud
00075 void wifi_send(void)
00076 {
00077  unsigned int distance;
00078 pc.printf("Uploading Wi-Fi Data");
00079 pc.printf("\r\nSet Wi-Fi into Single Channel Mode\r\n");
00080 strcpy(snd,"AT+CIPMUX=0"); //set wi-fi into single channel mode
00081 wifi.SendCMD(snd);
00082 pc.printf(snd);
00083 wifi.RcvReply(rcv,1000);
00084 pc.printf("\r\nMode status is %s",rcv);
00085 //Connecting to Thingspeak server
00086 pc.printf("\r\nConnecting to Thingspeak server\r\n");
00087 strcpy(snd,"AT+CIPSTART=\"TCP\",\"api.thingspeak.com\",80");
00088 pc.printf("\r\nSending data: %s",snd);
00089 wifi.SendCMD(snd);
00090 wifi.RcvReply(rcv,1000);
00091 pc.printf("\r\nServer status: %s",rcv);
00092 //Deliver Data
00093 pc.printf("\r\nDelivering Characters");
00094 strcpy(snd,"AT+CIPSEND=4,47\n");
00095 wifi.SendCMD(snd);
00096 wifi.RcvReply(rcv,1000);
00097 pc.printf("\r\nStatus sent: %s",rcv);
00098 //Upload values to cloud website
00099 pc.printf("Uploading data to Thingspeak\r\n");
00100 sprintf(snd,"GET https://api.thingspeak.com/update?key=QSL7YVXB73QHN2EK\n",distance);
00101 pc.printf("%s",snd);
00102 wifi.SendCMD(snd);
00103 wait(2);
00104 wifi.RcvReply(rcv,1000);
00105 pc.printf("\r\nStatus sent: %s",rcv);
00106 wait(2);
00107 //Closing connection
00108 pc.printf("\r\nClose the connection");
00109 strcpy(snd,"AT+CIPCLOSE");//Closing connection to the server
00110 wifi.SendCMD(snd);
00111 wifi.RcvReply(rcv,1000);
00112 pc.printf("%s",rcv);
00113 }
00114 
00115 
00116