Thomas Pettet
Demo code for a Wi-Fi controlled wall outlet that monitors light intensity, temperature, and motion and can control which plugs are supplied with power based off of user preference.
Dependencies: BH1750 DHT11_Lib mbed
Fork of
ECE4180_Lab4_ESP8266_IoT_Outlets
by 
Deron Mai
Diff: main.cpp
- Revision:
- 0:e2a155f50119
- Child:
- 1:71ed1afbf344
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Sat Feb 14 23:53:25 2015 +0000
@@ -0,0 +1,259 @@
+// ESP8266 Static page WEB server to control Mbed
+
+#include "mbed.h"
+#include "DS18B20.h"
+
+Serial pc(USBTX, USBRX);
+Serial esp(PTE0, PTE1); // tx, rx
+
+// Standard Mbed LED definitions
+DigitalOut led1(LED_RED); // (PTB18)
+DigitalOut led2(LED_GREEN); // (PTB19)
+DigitalOut led3(LED_BLUE); // (PTD1)
+
+// Digital Out and In pins, can be configured to any suitable pin depending on Platform
+DigitalOut Out1(PTC7);
+DigitalOut Out2(PTC0);
+DigitalOut Out3(PTC3);
+
+DigitalIn In1(PTC12);
+DigitalIn In2(PTC13);
+DigitalIn In3(PTC16);
+
+AnalogIn BATin(PTC1);
+
+DS18B20 thermom(PTB0, DS18B20::RES_12_BIT);
+
+Timer t;
+Timer t1;
+
+int buflen, DataRX, count, ended, servreq, timeout;
+int bufl, ipdLen, linkID, weberror;
+float temperature, AdcIn, Ht;
+float R1=100000, R2=10000; // resistor values to give a 10:1 reduction of measured AnalogIn voltage
+char Vcc[10];
+char Temp[10];
+char temp[10];
+char timebuf[30];
+char type[16];
+char type1[16];
+char channel[2];
+char snd[256];
+char webdata[1024]; // This may need to be bigger depending on WEB browser used
+char buf[2048]; // Currently using 1407 characters, Increase this if more web page data added
+
+void SendCMD(),getreply(),ReadWebData(),startserver(),sendpage(),SendWEB(),sendcheck();
+void gettime(),gettemp(),getbattery();
+
+// Serial Interrupt read ESP data
+void callback() {
+ while (esp.readable()) {buf[count] = esp.getc();count++;}
+ if(strlen(buf)>buflen){DataRX=1;}
+}
+
+int main() {
+ led1=1,led2=1,led3=1;
+ pc.baud(115200);
+ esp.baud(115200); // ESP8266 baudrate.
+ if (time(NULL) < 1420070400) {set_time(1420070400);}
+
+ startserver();
+
+ while(1){
+
+ if(DataRX==1){
+ ReadWebData();
+ if (servreq == 1 && weberror == 0){sendpage();}
+ pc.printf(" IPD Data:\r\n\n Link ID = %d,\r\n IPD Header Length = %d \r\n IPD Type = %s\r\n", linkID, ipdLen, type);
+ pc.printf("\n\n HTTP Packet: \n\n%s\n", webdata);
+ pc.printf(" Web Characters sent : %d\n\n", bufl);
+ pc.printf(" -------------------------------------\n\n");
+ esp.attach(&callback);
+ servreq=0;
+ }
+ }
+}
+// Static WEB page
+void sendpage()
+{
+ gettemp();getbattery();gettime();
+// WEB page data
+ memset(buf, '\0', sizeof(buf));
+ strcpy(buf, "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\nPragma: no-cache\r\n\r\n");
+ strcat(buf, "<html><head><title>ESP8266 Mbed</title></head>\r\n");
+ strcat(buf, "<body>\r\n");
+ strcat(buf, "<h1>ESP8266 Mbed Web Controller</h1>\r\n");
+ strcat(buf, "<br /><hr>\r\n");
+ strcat(buf, "<h3>Mbed RTC Time - ");
+ strcat(buf, timebuf);
+ strcat(buf, "</h3>\r\n");
+ strcat(buf, "<p><form method=\"POST\"><strong> Temperature: <input type=\"text\" size=4 value=\"");
+ strcat(buf, Temp);
+ strcat(buf, "\"> <sup>O</sup>C <form method=\"POST\"> <strong> Battery: <input type=\"text\" size=4 value=\"");
+ strcat(buf, Vcc);
+ strcat(buf, "\"> </sup>V");
+ if(led1==1){strcat(buf, "<p><input type=\"radio\" name=\"led1\" value=\"0\" checked> Red LED off");
+ strcat(buf, "<br><input type=\"radio\" name=\"led1\" value=\"1\" > Red LED on");}
+ else{strcat(buf, "<p><input type=\"radio\" name=\"led1\" value=\"0\" > Red LED off");
+ strcat(buf, "<br><input type=\"radio\" name=\"led1\" value=\"1\" checked> Red LED on");}
+ if(Out1==0){strcat(buf, "<p><input type=\"radio\" name=\"Out1\" value=\"0\" checked> Digital Out 1 off");
+ strcat(buf, "<br><input type=\"radio\" name=\"Out1\" value=\"1\" > Digital Out 1 on");}
+ else{strcat(buf, "<p><input type=\"radio\" name=\"Out1\" value=\"0\" > Digital Out 1 off");
+ strcat(buf, "<br><input type=\"radio\" name=\"Out1\" value=\"1\" checked> Digital Out 1 on");}
+ if(Out2==0){strcat(buf, "<p><input type=\"radio\" name=\"Out2\" value=\"0\" checked> Digital Out 2 off");
+ strcat(buf, "<br><input type=\"radio\" name=\"Out2\" value=\"1\" > Digital Out 2 on");}
+ else{strcat(buf, "<p><input type=\"radio\" name=\"Out2\" value=\"0\" > Digital Out 2 off");
+ strcat(buf, "<br><input type=\"radio\" name=\"Out2\" value=\"1\" checked> Digital Out 2 on");}
+ if(Out3==0){strcat(buf, "<p><input type=\"radio\" name=\"Out3\" value=\"0\" checked> Digital Out 3 off");
+ strcat(buf, "<br><input type=\"radio\" name=\"Out3\" value=\"1\" > Digital Out 3 on");}
+ else{strcat(buf, "<p><input type=\"radio\" name=\"Out3\" value=\"0\" > Digital Out 3 off");
+ strcat(buf, "<br><input type=\"radio\" name=\"Out3\" value=\"1\" checked> Digital Out 3 on");}
+ if(In1==0){strcat(buf, "<p><input type=\"radio\" name=\"In1\" value=\"0\" > Digital In 1");}
+ else{strcat(buf, "<p><input type=\"radio\" name=\"In1\" value=\"1\" checked> Digital In 1");}
+ if(In2==0){strcat(buf, "<br><input type=\"radio\" name=\"In2\" value=\"0\" > Digital In 2");}
+ else{strcat(buf, "<br><input type=\"radio\" name=\"In2\" value=\"1\" checked> Digital In 2");}
+ if(In3==0){strcat(buf, "<br><input type=\"radio\" name=\"In3\" value=\"0\" > Digital In 3");}
+ else{strcat(buf, "<br><input type=\"radio\" name=\"In3\" value=\"1\" checked> Digital In 3");}
+ strcat(buf, "</strong><p><input type=\"submit\"></form></span>");
+ strcat(buf, "</body>\r\n</html>\r\n");
+ strcat(buf, "<p/><h2>How to use:</h2><ul>");
+ strcat(buf, "<li>Select the Radio buttons to control the digital out pins.</li>");
+ strcat(buf, "<li>Click 'Submit Query' to send.</li>");
+ strcat(buf, "<li>Use the 'Submit Query' button to refresh the page.</li>");
+ strcat(buf, "</ul>");
+// end of WEB page data
+ bufl = strlen(buf); // get total page buffer length
+ sprintf(snd,"AT+CIPSEND=%s,%d\r\n", channel, bufl); // send IPD link channel and buffer character length.
+ SendCMD();
+ wait_ms(100);
+ SendWEB(); // send web page
+ sendcheck();
+}
+
+// wait for ESP "SEND OK" reply, then close IP to load web page, if lock out, system fully restarts
+void sendcheck()
+{
+ timeout=200;
+ weberror=1;t1.reset();t1.start();
+ while(weberror==1 && t1.read() <10){
+ getreply();
+ if (strstr(buf, "SEND OK") != NULL) {weberror=0;} // wait for valid SEND OK
+ }
+ t1.stop();
+ if(weberror==1){
+ pc.printf("\n\n\n ++++++++++ WEB Connect Error, restarting ... ++++++++++\n\n");
+ NVIC_SystemReset();}
+ strcpy(snd, "AT+CIPCLOSE=0\r\n");
+ SendCMD();
+}
+
+// Reads and processes GET and POST web data
+void ReadWebData()
+ {
+ wait_ms(200);
+ led3=0;
+ count=0;DataRX=0;weberror=0;
+ esp.attach(NULL);
+ int x = strcspn (buf,"+");
+ if(x){
+ strcpy(webdata, buf + x);weberror=0;
+ int numMatched = sscanf(webdata,"+IPD,%d,%d:%s", &linkID, &ipdLen, type);
+ if( strstr(webdata, "led1=1") != NULL ) {led1=0;}
+ if( strstr(webdata, "led1=0") != NULL ) {led1=1;}
+ if( strstr(webdata, "Out1=1") != NULL ) {Out1=1;}
+ if( strstr(webdata, "Out1=0") != NULL ) {Out1=0;}
+ if( strstr(webdata, "Out2=1") != NULL ) {Out2=1;}
+ if( strstr(webdata, "Out2=0") != NULL ) {Out2=0;}
+ if( strstr(webdata, "Out3=1") != NULL ) {Out3=1;}
+ if( strstr(webdata, "Out3=0") != NULL ) {Out3=0;}
+ sprintf(channel, "%d",linkID);
+ if (strstr(webdata, "GET") != NULL) {servreq=1;}
+ if (strstr(webdata, "POST") != NULL) {servreq=1;}
+ }
+ else {strcpy(webdata, buf);weberror=1;}
+ led3=1;
+}
+// Starts and restarts webserver if errors detected.
+void startserver()
+{
+ esp.attach(NULL);
+ pc.printf("++++++++++ Resetting ESP ++++++++++\r\n");
+ wait(1);
+ strcpy(snd,"AT+RST\r\n");
+ SendCMD();
+ pc.printf("\n++++++++++ Starting Server ++++++++++\r\n");
+ wait(3);
+ strcpy(snd, "AT+CIPMUX=1\r\n"); // set multiple connections.
+ SendCMD();
+ wait_ms(50);
+ strcpy(snd, "AT+CIPSERVER=1,80\r\n"); // set to port 80, you can change this to what you want.
+ SendCMD();
+ wait_ms(200);
+ pc.printf("\n Getting Server IP \r\n");
+ strcpy(snd, "AT+CIFSR\r\n");
+ timeout=500;
+ while(weberror==0){
+ SendCMD();getreply();
+ if (strstr(buf, "0.0.0.0") == NULL) {weberror=1;} // wait for valid IP
+ }
+ pc.printf("\n Enter WEB address in your browser \r\n\n");
+ buf[strlen(buf) - 8] = '\0';
+ char* IP = buf + 5;
+ sprintf(snd," http://%s:80", IP);
+ pc.printf(snd);
+ while (esp.readable()){esp.getc();}
+ buflen=200;count=0;
+ memset(buf, '\0', sizeof(buf));
+ led2=0;wait(2);led2=1;
+ pc.printf("\n\n++++++++++ Ready ++++++++++\r\n\n");
+ esp.attach(&callback);
+}
+// ESP Command data send
+void SendCMD()
+{
+ esp.printf("%s", snd);
+}
+// Large WEB buffer data send
+void SendWEB()
+{
+ int i=0;
+ if(esp.writeable()) {
+ while(buf[i]!='\0') {esp.putc(buf[i]);i++;}
+ }
+}
+// Get Cammand and ESP status replies
+void getreply()
+{
+ memset(buf, '\0', sizeof(buf));
+ t.start();
+ ended=0;count=0;
+ while(!ended) {
+ if(esp.readable()) {
+ buf[count] = esp.getc();count++;
+ }
+ if(t.read_ms() > timeout) {
+ ended = 1;t.stop();t.reset();
+ }
+ }
+}
+// Analog in example
+void getbattery()
+{
+ AdcIn=BATin.read();
+ Ht = (AdcIn*3.328*(R1+R2)/R2); // set the numeric to the exact MCU analog reference voltage for greater accuracy
+ sprintf(Vcc,"%2.3f",Ht);
+}
+// Temperature example
+void gettemp()
+{
+ temperature=thermom.GetTemperature(); // comment this out if no sensor connected
+ //temperature = 21.357; // include for dummy value
+ sprintf(Temp,"%3.3f",temperature);
+}
+// Get RTC time
+void gettime()
+{
+ time_t seconds = time(NULL);
+ strftime(timebuf,50,"%H:%M:%S %a %d %b %y", localtime(&seconds));
+}
+