Merge pull request #29 from brentru/fix-ex-09

fix for esp32's lack of analogwrite implementation

Author: brentru

examples/adafruitio_09_analog_out/adafruitio_09_analog_out.ino

@@ -28,6 +28,15 @@ AdafruitIO_Feed *analog = io.feed("analog");
 
 void setup() {
 
+  // set up led pin as an analog output
+  #if defined(ARDUINO_ARCH_ESP32)
+    // ESP32 pinMode()
+    ledcAttachPin(LED_PIN, 1);
+    ledcSetup(1, 1200, 8);
+  #else
+    pinMode(LED_PIN, OUTPUT);
+  #endif
+
   // start the serial connection
   Serial.begin(115200);
 
@@ -53,7 +62,6 @@ void setup() {
   // we are connected
   Serial.println();
   Serial.println(io.statusText());
-  analog->get();
 
 }
 
@@ -77,6 +85,13 @@ void handleMessage(AdafruitIO_Data *data) {
 
   Serial.print("received <- ");
   Serial.println(reading);
-  analogWrite(LED_PIN, reading);
+
+  
+  // write the current 'reading' to the led
+  #if defined(ARDUINO_ARCH_ESP32)
+    ledcWrite(1, reading); // ESP32 analogWrite()
+  #else
+    analogWrite(LED_PIN, reading);
+  #endif
 
 }