Merge pull request adafruit#1232 from ladyada/master

simple demo

Author: ladyada

GP2Y1014AU0F_demos/GP2Y1014AU/.esp8266.test.only

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+

GP2Y1014AU0F_demos/GP2Y1014AU/.uno.test.only

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+

GP2Y1014AU0F_demos/GP2Y1014AU/GP2Y1014AU.ino

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+#define dustPin A0 // Black wire
+#define ledPin 5  // White wire
+
+#define ANALOG_VOLTAGE 3.3 // analog top of range
+
+// Yellow, Green wire connects to ground
+// Blue wire connects to 5V via 150 ohm resistor (see DS)
+// Red wire connects to 5V
+ 
+void setup()
+{
+  Serial.begin(115200);
+  while (!Serial) delay(100);
+  
+  Serial.println("GP2Y1010AU0F Sensor demo");
+  pinMode(ledPin, OUTPUT);
+}
+ 
+ 
+void loop()
+{
+  float output_voltage, dust_density;
+  
+  digitalWrite(ledPin, LOW); // power on the LED
+  delayMicroseconds(280); // Wait 0.28ms according to DS
+  // take analog reading
+  output_voltage = analogRead(dustPin); 
+  delay(1);
+  
+  digitalWrite(ledPin, HIGH); // turn the LED off
+
+  output_voltage = (output_voltage / 1023) * ANALOG_VOLTAGE;
+  dust_density = (0.18 * output_voltage) - 0.1;
+
+  Serial.print("Voltage = ");
+  Serial.print(output_voltage);
+  Serial.print(",\tDust Density = ");
+  Serial.print(dust_density);
+  Serial.println(" mg/m3");
+  delay(1000);
+}