Diff: main.cpp

Revision:

0:339d1e10c98b

diff -r 000000000000 -r 339d1e10c98b main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Dec 04 15:50:51 2020 +0000
@@ -0,0 +1,91 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2019 ARM Limited
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "mbed.h"
+#include "platform/mbed_thread.h"
+#include "stdio.h"
+/* Reference resistor in series with the thermistor is of 10 KOhm */
+#define R_REFERENCE (float)(10000)
+/* Beta constant of this thermistor is 3380 Kelvin. See the thermistor
+   (NCP18XH103F03RB) data sheet for more details. */
+#define B_CONSTANT (float)(3380)
+/* Resistance of the thermistor is 10K at 25 degrees C (from data sheet)
+   Therefore R0 = 10000 Ohm, and T0 = 298.15 Kelvin, which gives
+   R_INFINITY = R0 e^(-B_CONSTANT / T0) = 0.1192855 */
+#define R_INFINITY (float)(0.1192855)
+/* Zero Kelvin in degree C */
+#define ABSOLUTE_ZERO (float)(-273.15)
+//static DigitalIn thermVDD(P10_0);  // if wing is detached and powered from 3.3v
+//static DigitalIn thermGND(P10_3);  // don't need to control power to thermistor
+   
+
+// Blinking rate in milliseconds
+#define BLINKING_RATE_MS 500
+//  #define SW2 P0_4
+//  #define SW3 P12_3
+
+char buffer[80];
+/* prototype of function */
+void displayAt( int x, int y, char *buffer );
+
+int main()
+{
+    // Initialise the digital pin LED1 as an output
+//    DigitalOut led(LED1);
+//    DigitalIn pushButton(SW2, PullUp);
+    AnalogIn vTherm(P10_1);  //Input pin of Thermister potential divider
+    AnalogIn lightLevel(P10_4);  //  
+    DigitalOut redLed2 (P10_5);
+    DigitalOut greenLed (P10_0);
+    DigitalOut yellowLed (P0_5);
+    DigitalIn switch3 (P12_3);
+    AnalogIn pot (P10_2);
+    
+    printf("\033[2J\033[H"); // clear screen and move the cursor to 0, 0
+    printf("\033[?25l"); // Turn off visible cursor
+    printf("Environmental Control System");
+//    printf( "\033[34m" );
+    fflush(stdout); // send the codes to the terminal
+ 
+    while (true) {
+        if (switch3 == 1)  
+        redLed2 = !redLed2;
+        
+        float potValue = pot.read();
+        if (potValue < 0.3)  
+        greenLed = !greenLed;
+        
+        if (potValue > 0.7)
+        yellowLed = !yellowLed;
+ //       thread_sleep_for(BLINKING_RATE_MS);  
+/*        if (pushButton == 0) {
+            led = !led;
+            // read thermistor Voltage 
+    float refVoltage = vTherm.read() * 2.4; // Range of ADC 0->2*Vref
+    float refCurrent = refVoltage  / 10000.0; // 10k Reference Resistor
+    float thermVoltage = 3.3 - refVoltage;    // Assume supply voltage is 3.3v
+    float thermResistance = thermVoltage / refCurrent; 
+    float logrT = (float32_t)log((float64_t)thermResistance);
+ 
+    // Calculate temperature from the resistance of thermistor using Steinhart-Hart Equation 
+    float stEqn = (float32_t)((0.0009032679) + ((0.000248772) * logrT) + 
+                             ((2.041094E-07) * pow((float64)logrT, (float32)3)));
+ 
+    float temperatureC = (float32_t)(((1.0 / stEqn) - 273.15)  + 0.5);
+
+            sprintf(buffer, "Temperature is %2.1f\r\n", temperatureC);
+            displayAt(0, 3, buffer);
+
+        float lightPercent = ( 1 - lightLevel.read()) * 100;
+        sprintf( buffer, "Ambient Light is: %3.1f", lightPercent );
+        displayAt(1, 4, buffer);
+        thread_sleep_for(BLINKING_RATE_MS);  */
+    }
+}
+
+void displayAt( int x, int y, char *buffer ) {
+    printf( "\033[%d;%dH%s", y, x, buffer);
+    fflush(stdout);
+    }
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