update guide

.gitignore

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-*.py~
-*.ino~
+*~

Guardian_Robot_Zelda_BOTW/README.md

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+# Guardian Robot - Zelda BOTW
+
+Code to accompany this tutorial:
+https://learn.adafruit.com/guardian-robot-zelda-botw/

Guardian_Robot_Zelda_BOTW/Trinket_Guardian_Sketch/Trinket_Guardian_Sketch.ino

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+// Trinket Servo Monster sketch
+// Hardware: Adafruit Trinket (3V or 5V), micro servo, LED + resistor
+// Libraries: uses Adafruit_TiCoServo library to manage servo pulses,
+// even though NeoPixels are NOT being used here.
+
+#if !defined(__AVR_ATtiny85__)
+ #error "This code is for ATtiny boards"
+#endif
+#include <Adafruit_TiCoServo.h>
+#include <avr/power.h>
+
+// Servo parameters.  Pin MUST be 1 or 4 on a Trinket.  Servo position
+// is specified in raw timer/counter ticks (1 tick = 0.128 milliseconds).
+// Servo pulse timing is typically 1-2 ms, but can vary slightly among
+// servos, so you may need to tweak these limits to match your reality.
+#define SERVO_PIN  4 // Pins 1 or 4 are supported on Trinket
+#define SERVO_MIN  4 // ~1 ms pulse
+#define SERVO_MAX 26 // ~2 ms pulse
+
+#define LED_PIN    0 // "Eye" LED is connected here
+
+Adafruit_TiCoServo servo;
+
+void setup(void) {
+#if (F_CPU == 16000000L)
+  // 16 MHz Trinket requires setting prescale for correct timing.
+  // This MUST be done BEFORE servo.attach()!
+  clock_prescale_set(clock_div_1);
+#endif
+  servo.attach(SERVO_PIN);
+  pinMode(LED_PIN, OUTPUT);
+  digitalWrite(LED_PIN, HIGH);
+}
+
+uint32_t lastLookTime = 0; // Time of last head-turn
+
+void loop(void) {
+
+  unsigned long t = millis(); // Current time
+
+  // If more than 1/2 second has passed since last head turn...
+  if((t - lastLookTime) > 500) {
+    if(random(10) == 0) { // There's a 1-in-10 chance...
+      // ...of randomly moving the head in a new direction:
+      servo.write(random(SERVO_MIN, SERVO_MAX));
+      lastLookTime = t;   // Save the head-turn time for future reference
+    }
+  }
+
+  // Unrelated to head-turn check,
+  if(random(10) == 0) { // there's a 1-in-10 chance...
+    // ...of an "eye blink":
+    digitalWrite(LED_PIN, LOW);  // The LED turns OFF
+    delay(random(50, 250));      // for just a short random moment
+    digitalWrite(LED_PIN, HIGH); // then back ON
+  }
+
+  delay(100); // Repeat loop() about 10 times/second
+}