Add sketch for dwe os integration

Author: brandonhs

dweos_arduino/sketch.ino

@@ -0,0 +1,74 @@
+#include <PWM.h>
+
+// Pin configuration
+int led = 9;            // LED pin
+int brightness = 127;   // Initial brightness value for the PWM duty cycle
+float frequency = 60.3; // Initial frequency in Hz
+
+void setup()
+{
+    Serial.begin(9600);
+
+    // Initialize all timers except for timer0 to save timekeeping tasks
+    InitTimersSafe();
+
+    // Set the initial PWM frequency and duty cycle
+    if (SetPinFrequencySafe(led, frequency))
+    {
+        pwmWrite(led, brightness);
+        Serial.println("PWM frequency and initial duty cycle set.");
+    }
+    else
+    {
+        Serial.println("Failed to set frequency.");
+    }
+}
+
+void loop()
+{
+    if (Serial.available())
+    {
+        // Read frequency and duty cycle values over Serial
+        String inputString = Serial.readStringUntil('\n'); // Read string input until newline
+        inputString.trim();                                // Remove any extraneous spaces or newlines
+        int freqDutySplitIndex = inputString.indexOf(',');
+
+        if (freqDutySplitIndex != -1)
+        {
+            String freqStr = inputString.substring(0, freqDutySplitIndex);  // Extract frequency string
+            String dutyStr = inputString.substring(freqDutySplitIndex + 1); // Extract duty cycle string
+
+            // Parse floats
+            float newFrequency = freqStr.toFloat();
+            int newDutyCycle = dutyStr.toInt();
+
+            // Validate frequency range
+            if (newFrequency >= 1 && newFrequency <= 2000000)
+            {
+                // Set the PWM frequency and apply duty cycle
+                if (SetPinFrequencySafe(led, newFrequency))
+                {
+                    brightness = map(constrain(newDutyCycle, 0, 100), 0, 100, 0, 255);
+                    pwmWrite(led, brightness);
+                    Serial.print("Set frequency to: ");
+                    Serial.print(newFrequency);
+                    Serial.print(" Hz, duty cycle to: ");
+                    Serial.print(newDutyCycle);
+                    Serial.println("%");
+                }
+                else
+                {
+                    Serial.println("Failed to set new frequency.");
+                }
+            }
+            else
+            {
+                Serial.println("Invalid frequency value.");
+            }
+        }
+        else
+        {
+            Serial.println("Invalid input format. Use frequency,dutycycle (e.g., 60,50).");
+        }
+    }
+}