Diff: main.cpp

Revision:

0:5a4b2c91de63

Child:

1:a33e55fecf16

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed May 03 21:14:11 2017 +0000
@@ -0,0 +1,178 @@
+#include "mbed.h"
+#include "FSR.h"
+
+#include <ctype.h>
+#include <string>
+
+#include "SDFileSystem.h"
+#include "Adafruit_FONA.h"
+
+#define FONA_RST p12
+#define FONA_TX p13
+#define FONA_RX p14
+#define FONA_RI p11
+
+Serial pcSerial(USBTX, USBRX);
+
+DigitalOut led1(LED1);      //Fona status - on(connecting), off(disconnecting)
+DigitalOut led2(LED2);
+DigitalOut led3(LED3);      //Pressure status - on(child on seat), off(off seat)
+DigitalOut led4(LED4);      //Temperature status - on(Too hot), off(not hot)
+
+Adafruit_FONA fona(FONA_TX, FONA_RX, FONA_RST, FONA_RI);    //GSM
+
+SDFileSystem sd(p5, p6, p7, p8, "sd");      //SD card reader
+
+DigitalOut CtrlRelay(p16);      //Relay Controller
+
+FSR bottomFSR1(p20, 10); // Pin 17-20 is used as the AnalogIn pin and a 10k resistor is used as a voltage divider for the FSR
+FSR topFSR1(p19, 10);
+FSR topFSR2(p18, 10);
+FSR bottomFSR2(p17, 10);
+
+I2C i2c(p28, p27);      //I2C commands
+
+Serial bt(p9, p10);     //Bluetooth module
+
+float temp, avgTemp; //temperature in degrees C
+const int addr1 = 0xB4;     //Default MLX90614 address - 0x5A
+const int addr2 = 0x08;     //Changed another MLX90614 address to 0x04
+char data[3];
+bool danger;
+int onForce;
+
+float temp1,temp2,temp3,temp4,avgF;
+
+char pnum[22];
+char message[141]= "Emergency! Your child is still in the Smart Car Seat!";
+//Message to send to phone and contacts
+
+class FonaEventListener : public Adafruit_FONA::EventListener {
+    virtual void onRing() {
+        led1 = 1;
+    }
+    
+    virtual void onNoCarrier() {
+        led1 = 0; 
+    }
+};
+FonaEventListener fonaEventListener;
+//GSM Module initalization
+
+bool onSeat(float fLevel);      //Checks if there is a child on the seat
+float readTemp(int addr, char* cmd);    //Reads the temperature through the I2/C
+void callback(void);        //Changes the stored number on the SD card
+
+int main() {
+    pcSerial.baud(9600);        //Set the serial baudrate to 9600
+    wait(2);                    //Wait 2 secs to initialize and settle
+    i2c.frequency(50000);       //Set the I2C frequency to 50kHz for the MLX90614
+    wait(2);                    //Wait another 2 secs for initalization
+    
+    
+    char cmd1[1];
+    char cmd2[1];
+    cmd1[0] = 0x07;     //Command to read object temperature
+    cmd2[0] = 0x06;     //Command to read ambient temperature
+    
+    
+    pcSerial.printf("FONA basic test\r\n");
+    pcSerial.printf("Initializing....(May take 3 seconds)\r\n");
+    // See if the FONA is responding
+    if (! fona.begin(9600)) {
+        pcSerial.printf("Couldn't find FONA\r\n");
+        while (1);
+    }
+    fona.setEventListener(&fonaEventListener);
+    pcSerial.printf("FONA is OK\r\n");
+    
+    
+    bt.attach(&callback);       //Allows the app to change the phone number
+    
+    
+    //Reads the stored phone number
+    FILE *fpr = fopen("/sd/mydir/myphone.txt", "r");
+    if(fpr == NULL) {
+        error("Could not open file for read\n");
+    }
+    fscanf(fpr,"%s", pnum); 
+    pcSerial.printf("Phone Number: %s\n", pnum);
+    fclose(fpr);
+    
+    
+    danger = false;
+    
+    while (1) {
+        if (onSeat(0.2))        //Checks if child is on the seat
+                                // 0.2 is very low, 0.5 for moderate touch, 0.8 for heavy pressing
+        {   
+            led3 = 1;
+            
+            temp1 = readTemp(addr1, cmd1);      //Read object temperature (C)
+            temp2 = readTemp(addr2, cmd1);
+            //temp3 = readTemp(addr1, cmd2);    //Read ambient temperature (C)
+            //temp4 = readTemp(addr2, cmd2);
+            
+            avgTemp = (temp1+temp2)/2;          //Average value
+            //avgTemp = (temp3+temp4)/2;
+            printf("%5.2f\r\n",avgTemp);
+            
+            if ( avgTemp > 30)      //If value exceed a "bad" temperature
+            {
+                led4 = 1;
+                CtrlRelay = 1;      //Turn on cooling system
+                danger = true;
+            } else if ( avgTemp < 25)   //When it falls back down
+            {
+                led4 = 0;
+                CtrlRelay = 0;      //Turn off cooling system
+            }
+            if (danger) {       //When child is in "danger"
+                fona.sendSMS(pnum, message);    //FONA will send message to the contact
+            }
+        } else {
+            led3 = 0;
+            led4 = 0;
+            CtrlRelay = 0;      //When child is no longer on the seat
+            danger = false;     //The system resets
+        }
+        wait(1);
+    }
+}
+
+float readTemp(int addr, char* cmd) {   //read the value from the MLX90614
+    i2c.write(addr, cmd, 1, true);
+    i2c.read(addr, data, 3);        //Two bytes of data + 1 word of codes
+    
+    temp = (((float)((data[1]<<8)|data[0]))*0.02) - 273.15;
+    return temp;
+}
+
+bool onSeat(float fLevel) {     //Detects child by activating enough pressure sensors
+    onForce = 0;
+    if  (bottomFSR1.readRaw() > fLevel) {
+        onForce += 1;
+    }
+    if  (bottomFSR2.readRaw() > fLevel) {
+        onForce += 1;
+    }
+    if  (topFSR1.readRaw() > fLevel) {
+        onForce += 1;
+    }
+    if  (topFSR2.readRaw() > fLevel) {
+        onForce += 1;
+    }
+    return onForce >= 2;
+}
+
+void callback(void) {       //Rewrites the phone number saved in the SD card
+    bt.gets(pnum,11);
+    pcSerial.printf("New number: %s\n", pnum);
+            
+    FILE *fp = fopen("/sd/mydir/myphone.txt", "w");
+    if(fp == NULL) {
+        error("Could not open file for write\n");
+    }
+    fprintf(fp, "%s\n", pnum);
+    fclose(fp);
+}
\ No newline at end of file