add light sensor

1 files changed, 33 insertions, 11 deletions

diff --git a/sensor/sensor.ino b/sensor/sensor.ino
index 8b56c26..8d43b22 100644
--- a/sensor/sensor.ino
+++ b/sensor/sensor.ino
@@ -40,6 +40,10 @@
 // maximum accumulated stress
 #define STRESS_MAX 50
 
+// light sensor
+#define LIGHT_PIN    34
+#define DARKNESS_MAX 1000
+
 // arduino-esp32 Touch sensor
 #define TOUCH_PIN           T0  // T0 is GPIO4
 #define TOUCH_THRESHOLD     40
@@ -132,9 +136,33 @@ void keepPace() {
   }
 }
 
-// read fake gape angle sensor from pacemaker
-int getGapeAngle() {
-  return ledcRead(LED_PIN);
+// read light intensity and return its non-zero capped value
+int getLightIntensity() {
+  int value = analogRead(LIGHT_PIN);
+  if (value > DARKNESS_MAX)
+    value = DARKNESS_MAX;
+  log_i("light intensity: %d", value);
+
+  return DARKNESS_MAX - value;
+}
+
+// fake gape angle as pacemaker position dampened by light intensity
+int resolveGapeAngle() {
+  int paceAngle = ledcRead(LED_PIN);
+  log_i("pacemaker value: %d", value);
+
+  int lightIntensity = getLightIntensity();
+  log_i("light intensity: %d", value);
+
+  int gapeAngle = paceAngle * lightIntensity / DARKNESS_MAX;
+
+  // misuse error-only log level for plot-friendly output
+#if ARDUHAL_LOG_LEVEL == ARDUHAL_LOG_LEVEL_ERROR
+  Serial.printf("pace_angle:%d light/10:%d gape_angle:%d\n",
+    paceAngle, lightIntensity/10, gapeAngle);
+#endif
+
+  return gapeAngle;
 }
 
 // Encode static Bluetooth beacon advertisement data
@@ -174,20 +202,14 @@ void setup() {
   BLEDevice::init(BEACON_NAME);
   pAdvertising = BLEDevice::getAdvertising();
   setBeaconAdvertisement();
-  setBeaconServiceData(getGapeAngle());
+  setBeaconServiceData(resolveGapeAngle());
   pAdvertising->start();
 }
 
 void loop() {
 
   // update Bluetooth beacon service data
-  setBeaconServiceData(getGapeAngle());
-
-  // misuse error-only log level for plot-friendly output
-#if ARDUHAL_LOG_LEVEL == ARDUHAL_LOG_LEVEL_ERROR
-  Serial.printf("gape_angle:%d\n",
-    getGapeAngle());
-#endif
+  setBeaconServiceData(resolveGapeAngle());
 
   delay(500);
 }