main.cpp

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

//IR value ranges
float uplimit = .655;
float lowlimit = .467;

Serial pc(USBTX, USBRX);

AnalogIn  ainpin(p20); // ir sensor
DigitalOut led1(LED1);
DigitalOut led4(LED4);
Timer t;

//LCD system setup
float sensorval = 0.0;

int  count,ended,timeout;
char buf[2024];
char snd[1024];
char cPercent[8];
float percent;

 
char ssid[32] = "SSID";     // enter WiFi router ssid inside the quotes
char pwd [32] = "password"; // enter WiFi router password inside the quotes
 
//LCD screen
uLCD_4DGL mylcd(p28,p27,p30);


//Wifi Networking
//wifi chip var
Serial esp(p9, p10); // tx, rx
DigitalOut reset(p11);

//custom functions for calculating pill bottle
int  CalcPixValue(float, float, float);
void DrawProgressBar(int, int, int);
 
 
void SendCMD(),getreply(),ESPconfig(),ESPsetbaudrate();
 void dev_recv()
{
    led1 = !led1;
    while(esp.readable()) {
        pc.putc(esp.getc());
    }
}
 
void pc_recv()
{
    led4 = !led4;
    while(pc.readable()) {
        esp.putc(pc.getc());
    }
}
 
 
int main()
{
    //IR setup
        //IR value ranges
    float uplimit = .655;
    float lowlimit = .647;
    
    //LCD system setup
    mylcd.baudrate(3000000);
    float sensorval = 0.0;
    
    
    
    reset=0; //hardware reset for 8266
    pc.baud(9600);  // set what you want here depending on your terminal program speed
    pc.printf("\f\n\r-------------ESP8266 Hardware Reset-------------\n\r");
    wait(0.1);
    reset=1;
    timeout=2;
    getreply();
 
    esp.baud(9600);   // change this to the new ESP8266 baudrate if it is changed at any time. 
    ESPconfig();        //******************  include Config to set the ESP8266 configuration  ***********************
 
 
 
    pc.attach(&pc_recv, Serial::RxIrq);
    esp.attach(&dev_recv, Serial::RxIrq);
    
    // continuosly get AP list and IP
    while(1) {
        sleep();
        
        //IR sensor
        //sensorval = ainpin.read(); //read in voltage and set it to sensor val (between 0-1)            
        int pix = CalcPixValue(sensorval, uplimit, lowlimit);
        //Print progress bar to LCD
        //DrawProgressBar(pix, 2, 6);
    }
 
}

//IR sensor commands

//given analog value 0-1 num, returns pixel value at which the fill bar should be drawn
int CalcPixValue(float num, float up, float low) 
{
    float range = up-low;
    float height, sensornorm1, sensornorm;
    
    sensornorm1 = (num - low)/(range);
    sensornorm =-1* sensornorm1 + 1;
    
    //correct for small error
    if (sensornorm1<0)
        sensornorm1 = 0;
    else if (sensornorm1 >1.00)
        sensornorm1 = 1;
    //convert to percent
    sensornorm1 = sensornorm1*100.0;
        
    mylcd.cls();
    // print out the values
    mylcd.printf("\n   Percent Full =\n   %f2\n\n\n   SensorValue=\n   %3f", sensornorm1,num);
    
    
    //restrict the value a scaled value of 127 pixels
    height = (sensornorm)*127;
            
    //if outside of range, post to 0% or 100% of bar
    if (num > up) {
        height = 0;}
    else if (num < low) {
        height = 127;}
    return floor(height);
    
}

void DrawProgressBar(int pixVal, int startX, int endX)
{
    //clears value
    

    int count = 0;
    
    while ( (startX + count) <= endX ) 
    {        
        mylcd.line(startX + count, 127, startX + count, pixVal, WHITE);
        count = count + 1;        
    }
}



//Wifi Commands
 
// Sets new ESP8266 baurate, change the esp.baud(xxxxx) to match your new setting once this has been executed
void ESPsetbaudrate()
{
    strcpy(snd, "AT+CIOBAUD=9600\r\n");   // change the numeric value to the required baudrate
    SendCMD();
}
 
//  +++++++++++++++++++++++++++++++++ This is for ESP8266 config only, run this once to set up the ESP8266 +++++++++++++++
void ESPconfig()
{

    wait(1);
    pc.printf("\f---------- Starting ESP Config ----------\r\n\n");
        strcpy(snd,".\r\n.\r\n");
    SendCMD();
        wait(1);
    pc.printf("---------- Reset & get Firmware ----------\r\n");
    strcpy(snd,"node.restart()\r\n");
    SendCMD();
    timeout=5;
    getreply();
    pc.printf(buf);
 
    wait(.2);
 
    pc.printf("\n---------- Get Version ----------\r\n");
    strcpy(snd,"print(node.info())\r\n");
    SendCMD();
    timeout=4;
    getreply();
    pc.printf(buf);
 
    wait(.3);
 
    // set CWMODE to 1=Station,2=AP,3=BOTH, default mode 1 (Station)
    pc.printf("\n---------- Setting Mode ----------\r\n");
    strcpy(snd, "wifi.setmode(wifi.STATION)\r\n");
    SendCMD();
    timeout=4;
    getreply();
    pc.printf(buf);
 
    wait(.2);
 
   
 
    pc.printf("\n---------- Listing Access Points ----------\r\n");
    strcpy(snd, "function listap(t)\r\n");
        SendCMD();
        wait(1);
        strcpy(snd, "for k,v in pairs(t) do\r\n");
        SendCMD();
        wait(1);
        strcpy(snd, "print(k..\" : \"..v)\r\n");
        SendCMD();
        wait(1);
        strcpy(snd, "end\r\n");
        SendCMD();
        wait(1);
        strcpy(snd, "end\r\n");
        SendCMD();
        wait(1);
        strcpy(snd, "wifi.sta.getap(listap)\r\n");
    SendCMD();
    wait(1);
        timeout=15;
    getreply();
    pc.printf(buf);
 
    wait(.2);
 
    pc.printf("\n---------- Connecting to AP ----------\r\n");
    pc.printf("ssid = %s   pwd = %s\r\n",ssid,pwd);
    strcpy(snd, "wifi.sta.config(\"");
    strcat(snd, ssid);
    strcat(snd, "\",\"");
    strcat(snd, pwd);
    strcat(snd, "\")\r\n");
    SendCMD();
    timeout=10;
    getreply();
    pc.printf(buf);
 
    wait(.5);
 
    pc.printf("\n---------- Get IP's ----------\r\n");
    strcpy(snd, "print(wifi.sta.getip())\r\n");
    SendCMD();
    timeout=3;
    getreply();
    pc.printf(buf);
 
    wait(1);
 
    pc.printf("\n---------- Get Connection Status ----------\r\n");
    strcpy(snd, "print(wifi.sta.status())\r\n");
    SendCMD();
    timeout=5;
    getreply();
    pc.printf(buf);
 
    pc.printf("\n\n\n  If you get a valid (non zero) IP, ESP8266 has been set up.\r\n");
    pc.printf("  Run this if you want to reconfig the ESP8266 at any time.\r\n");
    pc.printf("  It saves the SSID and password settings internally\r\n");
    wait(.10);
        
        
          pc.printf("\n---------- Setting up http server ----------\r\n");
    strcpy(snd, "srv=net.createServer(net.TCP)\r\n");
        SendCMD();
        wait(1);
        strcpy(snd, "srv:listen(80,function(conn)\r\n");
        SendCMD();
        wait(1);
        strcpy(snd, "conn:on(\"receive\",function(conn,payload)\r\n");
        SendCMD();
        wait(1);
        strcpy(snd, "print(payload)\r\n");
        SendCMD();
        wait(1);
        
        strcpy(snd, "conn:send(\"<!DOCTYPE html>\")\r\n");
        SendCMD();
      wait(1);
        
        strcpy(snd, "conn:send(\"<html>\")\r\n");
        SendCMD();
      wait(1);
        
        strcpy(snd, "conn:send(\"<h1> Welcome to the bottle monitoring system.</h1>\")\r\n");
      SendCMD();
        wait(1);
        
        
        
        strcpy(snd, "conn:send(\"<h2> Last time your bottle was checked for a fill level it contained </h2>\")\r\n");
        SendCMD();
        wait(1);
        
        //Send most recent IR sensor data to site
        //sensorval = ainpin.read(); //read in voltage and set it to sensor val (between 0-1)            
        int pix = CalcPixValue(sensorval, uplimit, lowlimit);
        
        //reset it
        strcpy(snd,"");
        sprintf(cPercent, "%f",percent);
        strcat(snd,cPercent);
        strcat(snd, "conn:send(\"<h2> percent of the pill's original level ");
        
        strcat(snd," </h2>\")\r\n");
        //strcat(snd, cPercent + "</h2>\")\r\n" );
        SendCMD();
        wait(1);
        
        strcpy(snd, "conn:send(\"</html>\")\r\n");
    SendCMD();
    wait(1);
        
        strcpy(snd, "end)\r\n");
    SendCMD();
    wait(1);
        
        strcpy(snd, "conn:on(\"sent\",function(conn) conn:close() end)\r\n");
    SendCMD();
    wait(1);
        strcpy(snd, "end)\r\n");
    SendCMD();
    wait(1);
        timeout=17;
    getreply();
    pc.printf(buf);
        pc.printf("\r\nDONE");
}
 
void SendCMD()
{
    esp.printf("%s", snd);
}
 
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() > timeout) {
            ended = 1;
            t.stop();
            t.reset();
        }
        
    }
}