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libraries/Adafruit_PWM_Servo_Driver_Library/examples/gpiotest/gpiotest.ino

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+/*************************************************** 
+  This is an example for our Adafruit 16-channel PWM & Servo driver
+  GPIO test - this will set a pin high/low
+
+  Pick one up today in the adafruit shop!
+  ------> http://www.adafruit.com/products/815
+
+  These drivers use I2C to communicate, 2 pins are required to  
+  interface.
+
+  Adafruit invests time and resources providing this open source code, 
+  please support Adafruit and open-source hardware by purchasing 
+  products from Adafruit!
+
+  Written by Limor Fried/Ladyada for Adafruit Industries.  
+  BSD license, all text above must be included in any redistribution
+ ****************************************************/
+
+#include <Wire.h>
+#include <Adafruit_PWMServoDriver.h>
+
+// called this way, it uses the default address 0x40
+Adafruit_PWMServoDriver pwm = Adafruit_PWMServoDriver();
+// you can also call it with a different address you want
+//Adafruit_PWMServoDriver pwm = Adafruit_PWMServoDriver(0x41);
+// you can also call it with a different address and I2C interface
+//Adafruit_PWMServoDriver pwm = Adafruit_PWMServoDriver(&Wire, 0x40);
+
+void setup() {
+  Serial.begin(9600);
+  Serial.println("GPIO test!");
+
+  pwm.begin();
+  pwm.setPWMFreq(1000);  // Set to whatever you like, we don't use it in this demo!
+
+  // if you want to really speed stuff up, you can go into 'fast 400khz I2C' mode
+  // some i2c devices dont like this so much so if you're sharing the bus, watch
+  // out for this!
+  Wire.setClock(400000);
+}
+
+void loop() {
+  // Drive each pin in a 'wave'
+  for (uint8_t pin=0; pin<16; pin++) {
+    pwm.setPWM(pin, 4096, 0);       // turns pin fully on
+    delay(100);
+    pwm.setPWM(pin, 0, 4096);       // turns pin fully off
+  }
+}