Diff: main.cpp

Revision:

0:11e1f075d0d2

Child:

1:d356fed1a9fa

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Mar 31 20:39:50 2015 +0000
@@ -0,0 +1,176 @@
+#include "mbed.h"
+#include "BLEPeripheral.h"
+
+//serial connection via USB 
+Serial serial(USBTX, USBRX);
+
+//Declare Input and Output pins
+DigitalIn pb(D3);
+AnalogIn pH_sensor(A0);
+InterruptIn button(D2); 
+DigitalOut led(LED_RED);
+
+// The SPI construct, REQN and RDYN IO construct should be modified manually
+// It depend on the board you are using and the REQN&RDYN configuration on BLE Shield
+SPI spi(PTD2, PTD3, PTD1);      
+DigitalInOut BLE_RDY(PTD5);  
+DigitalInOut BLE_REQ(PTD0); 
+DigitalInOut BLE_RESET(PTA13);
+
+//for BLE
+int count = 0;
+unsigned char txbuf[16] = {0};
+unsigned char txlen = 0;
+
+/*----- BLE Utility -------------------------------------------------------------------------*/
+// create peripheral instance, see pinouts above
+BLEPeripheral            blePeripheral        = BLEPeripheral(&BLE_REQ, &BLE_RDY, NULL);
+ 
+// create service
+BLEService               uartService          = BLEService("713d0000503e4c75ba943148f18d941e");
+ 
+// create characteristic
+//BLECharacteristic    txCharacteristic = BLECharacteristic("713d0002503e4c75ba943148f18d941e", BLENotify, 20);
+BLECharacteristic    rxCharacteristic = BLECharacteristic("713d0003503e4c75ba943148f18d941e", BLENotify, 20);
+/*--------------------------------------------------------------------------------------------*/
+ 
+unsigned int interval = 0;
+unsigned char count_on = 0;
+
+//for pH measurement
+int calib = 0;
+int avgReading = 0;
+bool calibrationORnot = true;
+bool ready = false;
+int* reading[] = {0,0};
+
+
+//This loop takes a reading by taking 15 measurements and averaging them when it is called in the loop "measure"
+int takeReading()
+{
+    double totalVal = 0.0;
+    double pH_sensor_read = 0.0;
+    int totalReadings = 0;
+    while(totalReadings < 16){
+        pH_sensor_read = pH_sensor.read();
+        totalVal = totalVal + pH_sensor_read;
+        totalReadings++;
+        }
+    int avgSensor = totalVal/15;      
+    return avgSensor;
+ }
+
+void calibration()
+{
+    serial.printf("enter calibration loop\n");
+    //Loop to take calibration value
+    calib = takeReading();
+    serial.printf("calib is %d\n", calib);
+}
+
+void calculate()
+{
+    serial.printf("entered calc\n");
+    //Take average of readings over 10 seconds        
+    avgReading = takeReading();
+    serial.printf("took reading\n");
+    ready = true;
+}
+
+void measure()
+{
+    serial.baud(115200);
+    serial.printf("start measurement");
+    //cb.mode(PullUp);
+    if(calibrationORnot)
+    {
+        calibration();
+        calibrationORnot = !calibrationORnot;
+    }    
+//Loop to take measurement        
+    else if(!calibrationORnot) 
+    {
+        serial.printf("enter measurement loop\n");
+        serial.printf("calib is %d\n", calib);
+        calculate();
+    }
+}
+
+
+int main()
+{ 
+    pb.mode(PullUp);
+    serial.baud(115200);
+    serial.printf("Hello SmartD!\n");
+    serial.printf("Serial begin!\r\n");
+    int pH,yint,tempC,tempF;
+
+     /*----- BLE Utility ---------------------------------------------*/
+    // set advertised local name and service UUID
+    blePeripheral.setLocalName("Sita");
+    
+    blePeripheral.setAdvertisedServiceUuid(uartService.uuid());
+        
+    // add service and characteristic
+    blePeripheral.addAttribute(uartService);
+    blePeripheral.addAttribute(rxCharacteristic);
+    //blePeripheral.addAttribute(txCharacteristic);
+
+    // begin initialization
+    blePeripheral.begin();
+    /*---------------------------------------------------------------*/
+
+    //serial.printf("GOT IT pH is %d, Temp is %d\n\r", reading[0], reading[1]);    
+    serial.printf("BLE UART Peripheral begin!\r\n");
+    if (calibrationORnot)
+    {    
+        button.rise(&measure);
+    }
+    
+    while(1)
+    {
+        //serial.printf("GOT IT pH is %d, Temp is %d\n\r", reading[0], reading[1]);    
+        BLECentral central = blePeripheral.central();
+        if (ready) 
+        {
+            //calcuating yintercept of the ADC -> pH equation using calibration value and given that calibration liquid is pH4
+            yint = (68.97*calib)-4;
+            serial.printf("yint is %f", yint);
+            //assumes linear relationship between pin readout -> voltage ->pH
+            pH = (0.0209*3300)*(avgReading)-yint;
+            //conversion to degrees C from sensor output voltage
+            tempC = (((3000*avgReading/1000) - 1.022129)/-0.0018496);
+            tempF = (tempC *9/5) + 32;
+            //print current pH and temp
+            serial.printf("pH = %5.2d & temp = %5.2d F\n\r", pH, tempF);
+            ready = !ready;
+        }
+        if (central) 
+        {
+            // central connected to peripheral
+            serial.printf("Connected to central\r\n");
+            while (central.connected()) 
+            {
+                if (!pb)  // if button pushed
+                {
+                    serial.printf("pH is %d, Temp is %d\n\r", pH, tempF);
+                    // Read and send out pH value from measure function
+                    //unsigned int value = pH;
+//                    serial.printf("VALUE IS %d\n\r", value);
+//                    const unsigned char val[1] = {value};
+//                    serial.printf("VALUE AFTER IS %d\n\r", val[1]);
+//                    rxCharacteristic.setValue(val,1);
+                    unsigned int value2 = tempF;
+                    serial.printf("VALUE FIRST IS %d\n\r", value2);
+                    const unsigned char val2[1] = {value2};
+                    serial.printf("VALUE AFTER IS %d\n\r", val2[1]);
+                    rxCharacteristic.setValue(val2,1);
+
+                }
+            }
+        
+            // central disconnected
+            serial.printf("Disconnected from central\r\n");
+        }
+    }
+}
\ No newline at end of file