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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.
main.cpp
- Committer:
- pakrishn
- Date:
- 2016-05-06
- Revision:
- 0:824af42f88ff
File content as of revision 0:824af42f88ff:
#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(); }