Diff: main.cpp

Revision:

5:a08ed9b4c671

Parent:

4:acc6be2bbe21

Child:

6:48052cf53bf2

--- a/main.cpp	Fri Sep 22 19:51:46 2017 +0000
+++ b/main.cpp	Sun Oct 08 02:44:47 2017 +0000
@@ -1,39 +1,64 @@
 /*
-    Project: aReadConditional (for analog read conditional)
+    Project: mySmrtNL_2(for My Smart Nightlight)
     File: main.cpp
-    
+
     Reads from analog input, streams ASCII text to std serial using printf and
-    lights onboard LED. Also demonstrates use of floating point literal suffix
-    toeliminate warning and int constants for HIGH and LOW.
-    
+    DigitalOut control of external LEDs. Default serial configuration is 9600 
+    baud, 8 data bits, no parity and 1 stop bit.
+
+    Requires manual calibration. Enter max. and min. values below, recompile 
+    and send to Nucleo board.
+
     Written by: Dr. C. S. Tritt
-    Created: 3/27/17 (v. 1.1)
-    
+    Created: 10/7/17 (v. 2.0)
+
 */
 #include "mbed.h"
 
 const int HIGH = 1; // Optional, but makes code more readable.
 const int LOW = 0; // Optional, but makes code more readable.
- 
+
 AnalogIn analog_value(A0); // Construct AnalogIn object called analog_value.
- 
-DigitalOut led(LED1); // Construct DigitalOut object called led.
+
+DigitalOut red(D2); // Construct DigitalOut object called red.
+DigitalOut grn(D3); // Construct DigitalOut object called grn.
+DigitalOut blu(D4); // Construct DigitalOut object called blu.
 
-int main() {
+int main()
+{
+    const float v_max = 1.0f; // Change to your max. serial value.
+    const float v_min = 0.0f; // Change to your min. serial value.
+    const float step = (v_max - v_min)/4.0f; // Calibration step size.
+    const float g_off_r_on = v_max - step; // Green off, red on value.
+    const float b_off_g_on = v_max - 2.0f*step; // Blue off, green on value.
+    const float b_on = v_max - 3.0f*step; // Blue on value.
+
     float value; // Value to be read and sent to serial port.
-    
+
     printf("\nAnalogIn example\n"); // Identify program.
-    
+
     while(true) {
         value = analog_value.read(); // Read the analog input value (0 to 1)
         printf("Value = %f\n", value); // Send value as text via serial port.
-        if (value > 0.5f) { // Activate built-in LED. The f is optional.
-          led.write(HIGH);
+        if (value > g_off_r_on) { // Activate red for darkest conditions.
+            red.write(HIGH);
+            grn.write(LOW);
+            blu.write(LOW);
+        } else if (value > b_off_g_on) { // Activate green for dim light.
+            red.write(LOW);
+            grn.write(HIGH);
+            blu.write(LOW);
+        } else if (value > b_on) {// Activate blue for brighter light.
+            red.write(LOW);
+            grn.write(LOW);
+            blu.write(HIGH);
+        } else { // All junctions off for brightest light.
+            red.write(LOW);
+            grn.write(LOW);
+            blu.write(LOW);
         }
-        else {
-          led.write(LOW);
-        }
-        printf("LED = %d\n", (int) led.read()); // Send LED state via serial. 
+        // Retreive and send LED state via serial.
+        printf("RGB State: %d %d %d\n", (int) red, (int) grn, (int) blu);
         wait(0.5); // Half a second (500 mS).
     }
 }
\ No newline at end of file