Merge pull request adafruit#370 from adafruit/Laser_Dog_Goggles

Laser Dog Goggles

Author: ladyada

Laser_Dog_Goggles/Laser_Dog_Goggles.ino

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+/*******************************************************************
+  SoftServo sketch for Adafruit Trinket. Increments values to change position on the servo 
+  (0 = zero degrees, full = 180 degrees)
+ 
+  Required library is the Adafruit_SoftServo library
+  available at https://github.com/adafruit/Adafruit_SoftServo
+  The standard Arduino IDE servo library will not work with 8 bit
+  AVR microcontrollers like Trinket and Gemma due to differences
+  in available timer hardware and programming. We simply refresh
+  by piggy-backing on the timer0 millis() counter
+ 
+  Required hardware includes an Adafruit Trinket microcontroller
+  a servo motor, and a potentiometer (nominally 1Kohm to 100Kohm
+ 
+  As written, this is specifically for the Trinket although it should
+  be Gemma or other boards (Arduino Uno, etc.) with proper pin mappings
+ 
+  Trinket:        USB+   Gnd   Pin #0  
+  Connection:     Servo+  -    Servo1
+ 
+ *******************************************************************/
+
+#include <Adafruit_SoftServo.h>  // SoftwareServo (works on non PWM pins)
+
+#define SERVO1PIN 0   // Servo control line (orange) on Trinket Pin #0
+int moveAmount = 1;  // change this value to change speed of servo
+int servoPos = 0;  // variable for servo position
+
+Adafruit_SoftServo myServo1;  //create servo object
+   
+void setup() {
+  // Set up the interrupt that will refresh the servo for us automagically
+  OCR0A = 0xAF;            // any number is OK
+  TIMSK |= _BV(OCIE0A);    // Turn on the compare interrupt (below!)
+  
+  myServo1.attach(SERVO1PIN);   // Attach the servo to pin 0 on Trinket
+  myServo1.write(90);           // Tell servo to go to position per quirk
+  delay(15);                    // Wait 15ms for the servo to reach the position
+}
+
+void loop()  {
+  
+    myServo1.write(servoPos);                    // tell servo to go to position
+  servoPos = servoPos + moveAmount;  // increment servo position (value between 0 and 180) 
+  if (servoPos == 0 || servoPos == 180){
+    moveAmount = -moveAmount; //reverse incrementer at bounds
+  }
+  delay(15);                              // waits 15ms for the servo to reach the position
+}
+
+// We'll take advantage of the built in millis() timer that goes off
+// to keep track of time, and refresh the servo every 20 milliseconds
+// The SIGNAL(TIMER0_COMPA_vect) function is the interrupt that will be
+// Called by the microcontroller every 2 milliseconds
+volatile uint8_t counter = 0;
+SIGNAL(TIMER0_COMPA_vect) {
+  // this gets called every 2 milliseconds
+  counter += 2;
+  // every 20 milliseconds, refresh the servos!
+  if (counter >= 20) {
+    counter = 0;
+    myServo1.refresh();
+  }
+}

Laser_Dog_Goggles/Laser_Dog_Goggles.py

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+# Laser Dog Goggles
+# https://learn.adafruit.com/laser-dog-goggles
+
+import time
+import board
+import pulseio
+from adafruit_motor import servo
+
+# servo pin for the M0 boards:
+pwm = pulseio.PWMOut(board.A2, duty_cycle=2 ** 15, frequency=50)
+my_servo = servo.Servo(pwm)
+speed = .04     # 40ms lower value means faster movement
+max_turn = 180  # rotation range 180 degree, half a circle
+
+while True:
+    # move stepper max_turn degrees clockwise
+    for angle in range(0, max_turn, 1):
+        my_servo.angle = angle
+        time.sleep(speed)
+
+    # move stepper max_turn degrees counter clockwise
+    for angle in range(max_turn, 0, -1):
+        my_servo.angle = angle
+        time.sleep(speed)

Laser_Dog_Goggles/README.md

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+# Laser_Dog_Goggles
+
+Code to accompany this Adafruit tutorial:
+https://learn.adafruit.com/laser-dog-goggles