main.cpp

// ESP8266 Static page WEB server to control Mbed

#include "mbed.h"
#include "uLCD_4DGL.h"
#include "Servo.h"

Serial pc(USBTX, USBRX);
Serial esp(p28, p27); // tx, rx

DigitalIn hardwareEnableSwitch(p30, PullDown);
DigitalIn hardwareValveSwitch(p29, PullDown);

//DigitalOut isBrokenPin(p23);

Timer timer;

volatile float distance = 0;
volatile bool isBroken = false;
volatile bool hardwareControl = false;
volatile bool webControl = false;
volatile float webControlServo = 0;

AnalogIn distanceSensorIR(p15);
uLCD_4DGL uLCD(p9,p10,p8);
Servo servo(p21);

// Standard Mbed LED definitions
DigitalOut  led1(LED1);
DigitalOut  led2(LED2);
DigitalOut  led3(LED3);
DigitalOut  led4(LED4);

// some test values to show on web page
AnalogIn   Ain1(p18);
AnalogIn   Ain2(p19);

/*
char ssid[32] = "hsd";     // enter WiFi router ssid inside the quotes
char pwd [32] = "austin123"; // enter WiFi router password inside the quotes
*/
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];

// things for sending/receiving data over serial
volatile int tx_in=0;
volatile int tx_out=0;
volatile int rx_in=0;
volatile int rx_out=0;
const int buffer_size = 4095;
char tx_buffer[buffer_size+1];
char rx_buffer[buffer_size+1];
void Tx_interrupt();
void Rx_interrupt();
void send_line();
void read_line();

int DataRX;
int update;
int count;
char cmdbuff[1024];
char replybuff[4096];
char webdata[4096]; // This may need to be bigger depending on WEB browser used
char webbuff[4096];     // Currently using 1986 characters, Increase this if more web page data added
char timebuf[30];
void SendCMD(),getreply(),ReadWebData(),startserver();
void gettime(),setRTC(),gettemp(),getbattery();
char rx_line[1024];
int port        =80;  // set server port
int SERVtimeout =5;    // set server timeout in seconds in case link breaks.
struct tm t;
// manual set RTC values
int minute      =00;    // 0-59
int hour        =12;    // 2-23
int dayofmonth  =26;    // 1-31
int month       =8;     // 1-12
int year        =15;    // last 2 digits

int main()
{
    //isBrokenPin = 0;
    float range=0.0005;
    float degrees=0.0;
    servo.calibrate(range, degrees);
    servo = 0;
    pc.baud(9600);
    esp.baud(9600);
    led1=1,led2=0,led3=0, led4=0;
    // Setup a serial interrupt function to receive data
    esp.attach(&Rx_interrupt, Serial::RxIrq);
    // Setup a serial interrupt function to transmit data
    esp.attach(&Tx_interrupt, Serial::TxIrq);
    if (time(NULL) < 1420070400) {
        setRTC();
    }
    startserver();
    DataRX=0;
    count=0;
    wait(1.0);
    while(1) {
        hardwareControl = (hardwareEnableSwitch == 1);
        if (hardwareControl) {
            uLCD.cls();
            uLCD.printf("HARDWARECONTROL\n");
            timer.stop();
            timer.reset();
            servo = hardwareValveSwitch;
        } else if (webControl) {
            uLCD.cls();
            uLCD.printf("WEBCONTROL\n");
            timer.stop();
            timer.reset();
            servo = webControlServo;
        } else if (!hardwareControl && !webControl) {
            uLCD.cls();
            uLCD.printf("AUTOCONTROL\n");
            distance = distanceSensorIR.read();
            if (timer.read() > 10.0) {                      //if feeder has been open too long
                isBroken = true;
            } else {
                if (servo == 0) {                           //if feeder is closed
                    if (distance < 1.65/3.3) {              //if food level > 15 cm away
                        servo = 1;                          //open feeder
                        uLCD.printf("Open valve");
                        timer.start();                      //start timer
                    }
                } else {
                    if (distance > 2.3/3.3) {               //if food level is < 10cm away
                        servo = 0;                          //close feeder
                        uLCD.printf("Close valve");
                        timer.stop();
                        timer.reset();
                    }
                }
            }
        } else {
            isBroken = true;
        }
        if (isBroken) {
            servo = 0;                                  //close feeder
            //isBrokenPin = 1;
            led1 = 1;
            led2 = 0;
            led3 = 0;
            led4 = 1;
            while(isBroken) {
                led1 = !led1;
                led2 = !led2;
                led3 = !led3;
                led4 = !led4;
                wait(0.2);
            }
        }
        
        if(DataRX==1) {
            ReadWebData();
            esp.attach(&Rx_interrupt, Serial::RxIrq);
        }
        if(update==1) // update time, hit count, and analog levels in the HUZZAH chip
        {
            // get new values
            gettime();
            gettemp();
            getbattery();
            count++;
            // send new values
            sprintf(cmdbuff, "count,time,analog1,analog2=%d,\"%s\",\"%s\",\"%s\"\r\n",count,timebuf,Temp,Vcc);
            SendCMD();
            getreply();
            update=0;   
        }
    }
}

// Reads and processes GET and POST web data
void ReadWebData()
{
    wait_ms(200);
    esp.attach(NULL,Serial::RxIrq);
    DataRX=0;
    memset(webdata, '\0', sizeof(webdata));
    strcpy(webdata, rx_buffer);
    memset(rx_buffer, '\0', sizeof(rx_buffer));
    rx_in = 0;
    rx_out = 0;
    // check web data for form information
    if( strstr(webdata, "check=led1v") != NULL ) {
        led1=!led1;
        webControlServo = 1;
    }
    if( strstr(webdata, "check=led2v") != NULL ) {
        led2=!led2;
        webControlServo = 0;
    }
    if( strstr(webdata, "check=led3v") != NULL ) {
        if (!hardwareControl) {
            webControl = !webControl;
        }
    }
    if( strstr(webdata, "check=led4v") != NULL ) {
        led4=!led4;
    }
    if( strstr(webdata, "POST") != NULL ) { // set update flag if POST request
        update=1;
    }
    if( strstr(webdata, "GET") != NULL && strstr(webdata, "favicon") == NULL ) { // set update flag for GET request but do not want to update for favicon requests
        update=1;
    }
}
// Starts webserver
void startserver()
{
    gettime();
    gettemp();
    getbattery();
    pc.printf("++++++++++ Resetting ESP ++++++++++\r\n");
    strcpy(cmdbuff,"node.restart()\r\n");
    SendCMD();
    wait(2);
    getreply();
    
    pc.printf("\n++++++++++ Starting Server ++++++++++\r\n> ");

    // initial values
    sprintf(cmdbuff, "count,time,analog1,analog2=0,\"%s\",\"%s\",\"%s\"\r\n",timebuf,Temp,Vcc);
    SendCMD();
    getreply();
    wait(0.5);

    //create server
    sprintf(cmdbuff, "srv=net.createServer(net.TCP,%d)\r\n",SERVtimeout);
    SendCMD();
    getreply();
    wait(0.5);
    strcpy(cmdbuff,"srv:listen(80,function(conn)\r\n");
    SendCMD();
    getreply();
    wait(0.3);
    strcpy(cmdbuff,"conn:on(\"receive\",function(conn,payload) \r\n");
    SendCMD();
    getreply();
    wait(0.3);
    
    //print data to mbed
    strcpy(cmdbuff,"print(payload)\r\n");
    SendCMD();
    getreply();
    wait(0.2);
   
    //web page data
    strcpy(cmdbuff,"conn:send('<!DOCTYPE html><html><body><h1>ECE4180 IoT Auto BirdFeeder</h1>')\r\n");
    SendCMD();
    getreply();
    wait(0.4);
    if (isBroken) {
        strcpy(cmdbuff,"conn:send('Current Status: Broken')\r\n");
        SendCMD();
        getreply();
    } else {
        strcpy(cmdbuff,"conn:send('Current Status: Working')\r\n");
        SendCMD();
        getreply();
    }
    wait(0.2);
    strcpy(cmdbuff,"conn:send('Food Level: '..analog1..' cm<br>Analog 2: '..analog2..' V<br><hr>')\r\n");
    SendCMD();
    getreply();
    wait(0.3);
    strcpy(cmdbuff,"conn:send('<form method=\"POST\"')\r\n");
    SendCMD();
    getreply();
    wait(0.3);
    strcpy(cmdbuff, "conn:send('<p><input type=\"checkbox\" name=\"check\" value=\"led1v\"> Open Feeder')\r\n");
    SendCMD();
    getreply();
    wait(0.3);
    strcpy(cmdbuff, "conn:send('<p><input type=\"checkbox\" name=\"check\" value=\"led2v\">Close Feeder')\r\n");
    SendCMD();
    getreply();
    wait(0.3);
    strcpy(cmdbuff, "conn:send('<p><input type=\"checkbox\" name=\"check\" value=\"led3v\"> Toggle Webcontrol')\r\n");
    SendCMD();
    getreply();
    wait(0.3);
    strcpy(cmdbuff,"conn:send('<p><input type=\"submit\" value=\"send-refresh\"></form>')\r\n");
    SendCMD();
    getreply();
    wait(0.3);
    strcpy(cmdbuff, "conn:send('<p><h2>How to use:</h2><ul><li>Select a checkbox to flip on/off</li><li>Click Send-Refresh to send data and refresh values</li></ul></body></html>')\r\n");
    SendCMD();
    getreply();
    wait(0.5); 
    // end web page data
    strcpy(cmdbuff, "conn:on(\"sent\",function(conn) conn:close() end)\r\n"); // close current connection
    SendCMD();
    getreply();
    wait(0.3);
    strcpy(cmdbuff, "end)\r\n");
    SendCMD();
    getreply();
    wait(0.2);
    strcpy(cmdbuff, "end)\r\n");
    SendCMD();
    getreply();
    wait(0.2);

    strcpy(cmdbuff, "tmr.alarm(0, 1000, 1, function()\r\n");
    SendCMD();
    getreply();
    wait(0.2);
    strcpy(cmdbuff, "if wifi.sta.getip() == nil then\r\n");
    SendCMD();
    getreply();
    wait(0.2);
    strcpy(cmdbuff, "print(\"Connecting to AP...\\n\")\r\n");
    SendCMD();
    getreply();
    wait(0.2);
    strcpy(cmdbuff, "else\r\n");
    SendCMD();
    getreply();
    wait(0.2);
    strcpy(cmdbuff, "ip, nm, gw=wifi.sta.getip()\r\n");
    SendCMD();
    getreply();
    wait(0.2);
    strcpy(cmdbuff,"print(\"IP Address: \",ip)\r\n");
    SendCMD();
    getreply();
    wait(0.2);
    strcpy(cmdbuff,"tmr.stop(0)\r\n");
    SendCMD();
    getreply();
    wait(0.2);
    strcpy(cmdbuff,"end\r\n");
    SendCMD();
    getreply();
    wait(0.2);
    strcpy(cmdbuff,"end)\r\n");
    SendCMD();
    getreply();
    wait(0.2);
    
    pc.printf("\n\n++++++++++ Ready ++++++++++\r\n\n");
}


// ESP Command data send
void SendCMD()
{
    int i;
    char temp_char;
    bool empty;
    i = 0;
// Start Critical Section - don't interrupt while changing global buffer variables
    NVIC_DisableIRQ(UART1_IRQn);
    empty = (tx_in == tx_out);
    while ((i==0) || (cmdbuff[i-1] != '\n')) {
// Wait if buffer full
        if (((tx_in + 1) % buffer_size) == tx_out) {
// End Critical Section - need to let interrupt routine empty buffer by sending
            NVIC_EnableIRQ(UART1_IRQn);
            while (((tx_in + 1) % buffer_size) == tx_out) {
            }
// Start Critical Section - don't interrupt while changing global buffer variables
            NVIC_DisableIRQ(UART1_IRQn);
        }
        tx_buffer[tx_in] = cmdbuff[i];
        i++;
        tx_in = (tx_in + 1) % buffer_size;
    }
    if (esp.writeable() && (empty)) {
        temp_char = tx_buffer[tx_out];
        tx_out = (tx_out + 1) % buffer_size;
// Send first character to start tx interrupts, if stopped
        esp.putc(temp_char);
    }
// End Critical Section
    NVIC_EnableIRQ(UART1_IRQn);
    return;
}

// Get Command and ESP status replies
void getreply()
{
    read_line();
    sscanf(rx_line,replybuff);
}
 
// Read a line from the large rx buffer from rx interrupt routine
void read_line() {
    int i;
    i = 0;
// Start Critical Section - don't interrupt while changing global buffer variables
    NVIC_DisableIRQ(UART1_IRQn);
// Loop reading rx buffer characters until end of line character
    while ((i==0) || (rx_line[i-1] != '\r')) {
// Wait if buffer empty
        if (rx_in == rx_out) {
// End Critical Section - need to allow rx interrupt to get new characters for buffer
            NVIC_EnableIRQ(UART1_IRQn);
            while (rx_in == rx_out) {
            }
// Start Critical Section - don't interrupt while changing global buffer variables
            NVIC_DisableIRQ(UART1_IRQn);
        }
        rx_line[i] = rx_buffer[rx_out];
        i++;
        rx_out = (rx_out + 1) % buffer_size;
    }
// End Critical Section
    NVIC_EnableIRQ(UART1_IRQn);
    rx_line[i-1] = 0;
    return;
}
 
 
// Interupt Routine to read in data from serial port
void Rx_interrupt() {
    DataRX=1;
    //led3=1;
// Loop just in case more than one character is in UART's receive FIFO buffer
// Stop if buffer full
    while ((esp.readable()) && (((rx_in + 1) % buffer_size) != rx_out)) {
        rx_buffer[rx_in] = esp.getc();
// Uncomment to Echo to USB serial to watch data flow
        pc.putc(rx_buffer[rx_in]);
        rx_in = (rx_in + 1) % buffer_size;
    }
    //led3=0;
    return;
}
 
 
// Interupt Routine to write out data to serial port
void Tx_interrupt() {
    //led2=1;
// Loop to fill more than one character in UART's transmit FIFO buffer
// Stop if buffer empty
    while ((esp.writeable()) && (tx_in != tx_out)) {
        esp.putc(tx_buffer[tx_out]);
        tx_out = (tx_out + 1) % buffer_size;
    }
    //led2=0;
    return;
}

void gettime()
{
    time_t seconds = time(NULL);
    strftime(timebuf,50,"%H:%M:%S %a %d %b %y", localtime(&seconds));
}

void setRTC()
{
    t.tm_sec = (0);             // 0-59
    t.tm_min = (minute);        // 0-59
    t.tm_hour = (hour);         // 0-23
    t.tm_mday = (dayofmonth);   // 1-31
    t.tm_mon = (month-1);       // 0-11  "0" = Jan, -1 added for Mbed RCT clock format
    t.tm_year = ((year)+100);   // year since 1900,  current DCF year + 100 + 1900 = correct year
    set_time(mktime(&t));       // set RTC clock
}
// Analog in example
void getbattery()
{
    AdcIn=Ain1.read();
    Ht = (AdcIn*3.3); // set the numeric to the exact MCU analog reference voltage for greater accuracy
    sprintf(Vcc,"%2.3f",Ht);
}
// Temperature example
void gettemp()
{
 
    AdcIn=Ain2.read();
    Ht = (AdcIn*3.3); // set the numeric to the exact MCU analog reference voltage for greater accuracy  
    sprintf(Temp,"%2.3f",Ht);
}