Diff: main.cpp

Revision:

0:11aaf2483a3c

Child:

1:b8231536af32

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sun Sep 24 03:24:14 2017 +0000
@@ -0,0 +1,240 @@
+// MBED SCRIPT FOR CONTROLLING THE TEMPERATURE CONTROLLED TEST FIXTURE
+// AUTHOR: JUSTIN RODENBURG
+// DATE: SEPTEMBER 2017
+
+//PLAN TO HAVE 18 CHANNELS PER MBED
+//HARDWARE: 
+//2 X VALVE DRIVER BOARD
+//1 X MBED
+//1 X ADC MUX (16 CHN)
+
+//FORMAT FOR CELL DATA: CHANNEL.TEMPERATURE.STATUS.E 2.23.1.E
+
+#include "mbed.h"
+#include "MCP23017.h"
+#include "MODSERIAL.h"
+#include <string>
+
+
+DigitalOut rLed(LED1);
+DigitalOut gLed(LED2);
+
+//DIGITAL CONTROL PINS
+DigitalOut valve(PTB8);
+DigitalOut heater(PTB9);
+
+//Init. I2C for CE Board
+MCP23017 mcp = MCP23017(PTC9, PTC8, 0x40);
+
+//GLOBAL
+// pullUp resistance
+int rUp = 10000; 
+//LUT size 
+int sizeLUT = 34;
+
+//LOOK UP TABLE
+const struct LUT {
+   int adc;
+   int temp;
+};
+
+LUT thermLUT[] = {
+    {62349,-40},
+    {61393,-35},
+    {60223,-30},
+    {58818,-25},
+    {57159,-20},
+    {55240,-15},
+    {53054,-10},
+    {50605,-5},
+    {47928,0},
+    {45069,5},
+    {42068,10},
+    {38975,15},
+    {35856,20},
+    {32768,25},
+    {29753,30},
+    {26867,35},
+    {24147,40},
+    {21602,45},
+    {19257,50},
+    {17116,55},
+    {15178,60},
+    {13465,65},
+    {11941,70},
+    {10579,75},
+    {9374,80},
+    {8309,85},
+    {7375,90},
+    {6548,95},
+    {5817,100},
+    {5179,105},
+    {4618,110},
+    {4127,115},
+    {3686,120},
+    {3304,125}
+};
+
+//ANALOG PINS
+AnalogIn ain0(A0);
+AnalogIn ain1(A1);
+AnalogIn ain2(A2);
+AnalogIn ain3(A3);
+AnalogIn ain4(A4);
+AnalogIn ain5(A5);
+
+MODSERIAL pc(USBTX, USBRX);
+
+volatile int bufA_index;
+const int numChnls = 15;
+float chTemps[numChnls];
+float chGoalTemps[numChnls];  
+float chStatus[numChnls];
+int numSamples = 5;
+volatile bool dataRecieved = false;
+char rxBuf[50];
+
+void rxInterrupt(MODSERIAL_IRQ_INFO *info){
+    gLed = 0;
+    wait(2);
+    gLed = 1;
+    dataRecieved = true;
+}
+
+void parseRXData(){
+    int pCount = 0; //count data collected
+    int i = 0;
+    int chnl = 0;
+    
+    string data = "";
+    
+    while(pCount < 3){
+        if(rxBuf[i] != '.'){
+            data += rxBuf[i];
+        }
+        else{
+            data = "";
+            pCount++; 
+            if(pCount == 1){ //get channel
+                if((pCount < 0) || (pCount > 15)){
+                    //check if channel is out of array index
+                    rLed = 0; 
+                }
+                else{
+                    chnl = atoi(data.c_str());
+                    pc.printf("CHANNEL: %i \r\n", chnl);
+                }
+            }
+            else if(pCount == 2){ //get channel temperature
+                chGoalTemps[chnl] = atoi(data.c_str());
+                pc.printf("TEMPERATURE: %i \r\n", chTemps[chnl]);
+            }
+            else if(pCount == 3){ //get channel status
+                chGoalTemps[chnl] = atoi(data.c_str());
+                pc.printf("STATUS: %i \r\n", chTemps[chnl]); 
+            }   
+        }
+        i++;
+    }
+}
+
+float getTemp(float ADC_val){ 
+    int i = 0;  
+    while((i < sizeLUT) && (thermLUT[i].adc > ADC_val)){
+        i++;    
+    }  
+    
+    float a = float(thermLUT[i-1].temp - thermLUT[i].temp);
+    float b = float(thermLUT[i-1].adc - thermLUT[i].adc);
+    
+    float m = a/b;
+    float y = (m*(ADC_val - thermLUT[i-1].adc))+thermLUT[i-1].temp;
+    
+    return y;
+}
+
+//16-bit ADC --> 2^16 = 65536
+void readTemps(){
+    float a_0 = 0.0;
+    
+    for(int i=0; i<numSamples; i++){
+        a_0 += ain0.read_u16();
+    }
+    
+    a_0 = a_0/numSamples;
+    
+    printf("ADC VAL: %f \r\n", a_0);
+
+    chTemps[0] = getTemp(a_0); 
+    
+    printf("TEMPERATURE (C): %f \r\n", chTemps[0]);
+    
+    printf("TEMPERATURE (C): 15 \r\n");
+}
+
+
+    
+
+int main() {
+    printf("Main Entered.\n");
+    //turn off LEDs
+    rLed = 1;
+    gLed = 1;
+    
+    //configure MCP23017
+    mcp.config(0,0,0);
+    
+    //
+    pc.baud(9600);
+    pc.autoDetectChar('E');
+    pc.attach(&rxInterrupt, MODSERIAL::RxAutoDetect);
+        
+    while(1) {
+        //read temperatures
+        readTemps();
+        
+        //buffer for noise
+        double hyst = 0.5;
+        
+        //check if we recieved data/need to update TCTF data
+        if(dataRecieved){
+            dataRecieved = false;
+            pc.move(rxBuf, 100);
+            pc.rxBufferFlush();
+            parseRXData();
+        }
+                
+        //Control loop:
+        //Loop through all channels and control
+        //chiller = 18C
+        for(int i=0; i<=numChnls; i++){
+            //control chiller
+            if(chTemps[i] > ((chGoalTemps[i])+hyst)){
+                //Turn on chiller
+                printf("CHILLER ON \r\n");
+                mcp.config(0,0,0);
+                mcp.write_bit(1, 8); 
+                printf("HEATER OFF \r\n");
+                mcp.write_bit(0, 9);
+            }
+            else if (chTemps[i] < ((chGoalTemps[i])-hyst)){
+                //turn off chiller
+                printf("CHILLER OFF \r\n");
+                mcp.config(0,0,0);
+                mcp.write_bit(0, 8); 
+                printf("HEATER ON \r\n");
+                mcp.write_bit(1, 9);
+            }
+            else{
+                //turn off chiller
+                printf("CHILLER OFF \r\n");
+                mcp.config(0,0,0);
+                mcp.write_bit(0, 8); 
+                printf("HEATER OFF \r\n");
+                mcp.write_bit(0, 9);
+            }
+            printf("\r\n");
+            wait(5);
+        }
+    }
+}