Merge pull request #987 from adafruit/pir-eye

Add user_pir.cpp

Author: ladyada

M4_Eyes/user_pir.cpp

@@ -0,0 +1,58 @@
+#if 0 // Change to 1 to enable this code (must enable ONE user*.cpp only!)
+
+// PIR motion sensor on pin 3 makes eyes open when motion is detected.
+
+#include "globals.h"
+
+#define PIR_PIN 3  // PIR sensor on D3 connector (between MIC & BAT)
+
+static uint8_t priorState;
+
+void user_setup(void) {
+  pinMode(PIR_PIN, INPUT);
+  priorState = digitalRead(PIR_PIN);
+  for(uint8_t e=0; e<NUM_EYES; e++) {
+    // Init to DEBLINK with an impossibly large duration to hold eyes shut.
+    eye[e].blink.state     = DEBLINK;
+    eye[e].blink.duration  = 0x7FFFFFFF;
+    eye[e].blink.startTime = micros();
+  }
+}
+
+void user_loop(void) {
+  uint8_t e, newState = digitalRead(PIR_PIN);
+  if(newState != priorState) {
+    if(newState) {
+      // Initial motion sensed
+      for(e=0; e<NUM_EYES; e++) {          // For each eye...
+        eye[e].blink.state     = DEBLINK;  // Opening...
+        eye[e].blink.duration  = 500000;   // Slowly, about 1/2 sec
+        eye[e].blink.startTime = micros(); // Starting now
+      }
+    } else {
+      // PIR timeout; "end" of motion
+      for(e=0; e<NUM_EYES; e++) {            // For each eye...
+        if(eye[e].blink.state != ENBLINK) {  // If not already blinking...
+          eye[e].blink.state     = ENBLINK;  // Start closing...
+          eye[e].blink.duration  = 1500000;  // Even slower, about 1.5 sec
+          eye[e].blink.startTime = micros(); // Starting now
+        }
+      }
+    }
+    priorState = newState;
+  } else if(!newState) {
+    // No change in state. If currently no motion active,
+    // force eyes into closed position at every opportunity.
+    for(e=0; e<NUM_EYES; e++) {           // For each eye...
+      if(eye[e].blink.state != ENBLINK) { // If not currently blinking...
+        // Set to DEBLINK with an impossibly large duration -- eyes will
+        // hold shut until motion event above resets start & duration.
+        eye[e].blink.state     = DEBLINK;
+        eye[e].blink.duration  = 0x7FFFFFFF;
+        eye[e].blink.startTime = micros();
+      }
+    }
+  }
+}
+
+#endif // 0