Padmaja Krishnakumar
esp 8266, a low cost wifi establishes tcp connection with a cloud server. A POST http request is sent. AT commands are used for communication.
Revision 0:824af42f88ff, committed 2016-05-06
- Comitter:
- pakrishn
- Date:
- Fri May 06 13:49:18 2016 +0000
- Commit message:
- esp8266 sends POST http request to ubidots website
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/DHT.lib Fri May 06 13:49:18 2016 +0000 @@ -0,0 +1,1 @@ +https://developer.mbed.org/users/pakrishn/code/DHT/#699568fad2b3
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Fri May 06 13:49:18 2016 +0000
@@ -0,0 +1,231 @@
+#include "mbed.h"
+#include "DHT.h"
+
+Serial pc(USBTX, USBRX);
+Serial esp(PTC17, PTC16); //FRDM K64F
+
+DHT sensor(D4, DHT11);
+DigitalIn pirInputPin(D2);
+
+Timer t1;
+
+int count,ended,timeout,getcount,replycount;
+char replybuff[1024];
+char cmdbuff[255];
+
+void SendCMD(),getreply(),getMotionSensor(),gettemp(), ESPconfig();
+void sendUbidotsData(int sensor, float value);
+
+
+int main()
+{
+ pc.baud(115200);
+ esp.baud(115200);
+ ESPconfig();
+ while(1){
+ wait(2);
+ gettemp();
+ wait(2);
+ getMotionSensor();
+ }
+
+}
+
+
+
+//configuration of esp8266
+void ESPconfig()
+{
+ timeout=1000;getcount=600;
+ wait(1);
+ strcpy(cmdbuff,"AT\r\n");
+ SendCMD();
+ timeout=1;
+ getreply();
+ wait(1);
+
+ pc.printf("Reset & get Firmware\r\n");
+ strcpy(cmdbuff,"AT+RST\r\n");
+ SendCMD();
+ timeout=5;
+ getreply();
+ pc.printf(replybuff);
+
+ wait(2);
+
+ pc.printf("\nGet Version\r\n");
+ strcpy(cmdbuff,"AT+GMR\r\n");
+ SendCMD();
+ timeout=4;
+ getreply();
+ pc.printf(replybuff);
+
+ wait(3);
+
+ // set CWMODE to 1=Station,2=AP,3=BOTH, default mode 1 (Station)
+ pc.printf("\nSetting Mode\r\n");
+ strcpy(cmdbuff, "AT+CWMODE=1\r\n");
+ SendCMD();
+ timeout=4;
+ getreply();
+ pc.printf(replybuff);
+
+ wait(2);
+
+ // set CIPMUX to 0=Single,1=Multi
+ pc.printf("\nSetting Connection Mode\r\n");
+ strcpy(cmdbuff, "AT+CIPMUX=1\r\n");
+ SendCMD();
+ timeout=4;
+ getreply();
+ pc.printf(replybuff);
+
+
+ wait(2);
+
+ pc.printf("\nConnecting to AP\r\n");
+ pc.printf("ssid = %s pwd = %s\r\n","ssid","password");
+ strcpy(cmdbuff, "AT+CWJAP=\"");
+ strcat(cmdbuff, "galaxy");
+ strcat(cmdbuff, "\",\"");
+ strcat(cmdbuff, "123456789");
+ strcat(cmdbuff, "\"\r\n");
+ SendCMD();
+ timeout=10;
+ getreply();
+ pc.printf(replybuff);
+
+ wait(5);
+
+
+
+ pc.printf("\nGet Connection Status\r\n");
+ strcpy(cmdbuff, "AT+CIPSTATUS\r\n");
+ SendCMD();
+ timeout=5;
+ getreply();
+ pc.printf(replybuff);
+
+ wait(1);
+
+}
+//temperature sensor reads the temp
+void gettemp()
+{
+float temperature = 0.0f;
+ int error = 0;
+
+ wait(2.0f);
+ error = sensor.readData();
+ if (error == 0) {
+ temperature = sensor.ReadTemperature(FARENHEIT);
+ pc.printf("Temperature in Farenheit %3.2f\n",temperature);
+ }
+ else{
+ pc.printf("Error: %d\n",error);
+ }
+
+ sendUbidotsData(2, temperature);
+ wait(2);
+}
+
+//pir sensor detects if there is motion
+void getMotionSensor(){
+ pc.printf("get motion sensor");
+ int val = pirInputPin.read(); // Continuously Read output of PIR sensor on D2 pin
+ if (val==0) // val=0 means there is a motion
+ {
+ for(int i =0;i<3 && val==0;i++)
+ {
+ val = pirInputPin.read();
+ wait(1);
+ }
+ if (val==0)
+ sendUbidotsData(1, 1.0);
+ }
+ else
+ wait(2);
+}
+
+//post dat ato ubidots website
+//pir=1,temp=2
+void sendUbidotsData(int sensor, float value){
+ char postData[255];
+ char valueChar[10];
+ char valLenChar[7];
+ int valLength = sprintf(valueChar,"%3.1f",value);
+ valLength = valLength+13;
+ sprintf(valLenChar,"%ld",valLength);
+
+ if(sensor == 1)
+ strcpy(postData, "POST /api/v1.6/variables/variable_id1/values/?token=token_id HTTP/1.1\r\n");
+ else{
+ strcpy(postData, "POST /api/v1.6/variables/variable_id2/values/?token=token_id HTTP/1.1\r\n");
+ }
+ strcat(postData, "Host: things.ubidots.com\r\n");
+ strcat(postData, "Content-Type: application/json\r\n");
+ strcat(postData, "Content-Length: ");
+ strcat(postData, valLenChar);
+ strcat(postData, "\r\n\r\n");
+ strcat(postData, "{\"value\": \"");
+ strcat(postData, valueChar);
+ strcat(postData, "\"}\r\n\r\n");
+
+ timeout=1000;getcount=600;
+
+ pc.printf("\nStart TCP\r\n");
+ strcpy(cmdbuff, "AT+CIPSTART=4,\"TCP\",\"things.ubidots.com\",80\r\n");
+ SendCMD();
+ timeout=5;
+ getreply();
+ pc.printf(replybuff);
+
+ wait(5);
+
+ pc.printf("\nConnecting\r\n");
+ sprintf(cmdbuff, "AT+CIPSEND=4,%d\r\n",strlen(postData));//strlen(postData)
+ SendCMD();
+ wait(3);
+ timeout=5;
+ getreply();
+ pc.printf(replybuff);
+
+ wait(2);
+
+ pc.printf("\nPOST Request\r\n");
+ strcpy(cmdbuff, postData);
+ SendCMD();
+ wait(7);
+ timeout=5;
+ getreply();
+ pc.printf(replybuff);
+
+ wait(5);
+ pc.printf("\nClose TCP\r\n");
+ strcpy(cmdbuff, "AT+CIPCLOSE\r\n");
+ SendCMD();
+ timeout=5;
+ getreply();
+ pc.printf(replybuff);
+
+ wait(2);
+}
+
+
+// ESP Command data send
+void SendCMD()
+{
+ esp.printf("%s", cmdbuff);
+}
+
+void getreply()
+{
+ memset(replybuff, '\0', sizeof(replybuff));
+ t1.reset(); t1.start();replycount=0;
+ while(t1.read_ms()< timeout && replycount < getcount) {
+ if(esp.readable()) {
+ replybuff[replycount] = esp.getc();replycount++;
+ }
+ }
+ t1.stop();
+}
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Fri May 06 13:49:18 2016 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/082adc85693f \ No newline at end of file