More energy saving features

firmware/config.h

@@ -16,8 +16,11 @@
 #define UPDATE_WEBSERVER_INTVERVAL_S   1
 #define DELAY_LOOP_MS                 50
 #define POWERSAVING_SLEEP_S          600
+#define EMERGENCY_SLEEP_S            172800 // Sleep for 2 days to recover
+#define ENERGY_SAVING_ITERATIONS     30
 
-#define BAT_LOW_VOLTAGE              3.4
+#define BAT_LOW_VOLTAGE                 3.6
+#define BAT_EMERGENCY_DEEPSLEEP_VOLTAGE 3.5
 
 #define STATUS_LED_PIN        BUILTIN_LED
 #define ANEMOMETER_PIN        D7
@@ -28,6 +31,7 @@
 #define BME_CS   10
 
 #define INITIAL_WEBSERVER_TIME 20
+#define WEBUPDATER_FEATURE 0
 
 #define SEALEVELPRESSURE_HPA (1013.25)
 
@@ -40,6 +44,4 @@ const char     *INFLUXDB_DB   = "weatherstation";
 const char     *INFLUXDB_USER = "oko";
 const char     *INFLUXDB_PASS = "de1873a0d2f8f21f17cf4d8db4f65c59";
 
-String DEVICE_NAME  = "klaute";
-
-
+String DEVICE_NAME  = "aaron";

firmware/firmware.ino

@@ -37,6 +37,7 @@ float currentSensorData[6] = {0.0, 0.0, 0.0, 0.0, 0.0, 0.0};
 
 uint16_t update_sensor_cnt    = 0;
 uint16_t update_webserver_cnt = 0;
+uint16_t energySavingIterations = 0;
 
 WiFiManager wifiManager;
 Influxdb influxdb(INFLUXDB_HOST, INFLUXDB_PORT);
@@ -48,7 +49,6 @@ String localIP = "127.0.0.1";
 //*************************************************************************//
 
 void setup() {
-
   //WiFi.disconnect(); // erase the wifi credentials
 
 #ifdef DEBUG
@@ -60,13 +60,12 @@ void setup() {
   pinMode(ANEMOMETER_PIN, INPUT_PULLUP);
   pinMode(A0, INPUT);
 
-  digitalWrite(STATUS_LED_PIN, HIGH);
+  digitalWrite(STATUS_LED_PIN, LOW);
 
   // Establish WiFi connection
   String wifiName = "oko-weather-" + String(ESP.getChipId());
 
   wifiManager.setMinimumSignalQuality(15);
-
   wifiManager.setConnectTimeout(60); // the time in seconds to wait for the known wifi connection
   wifiManager.setTimeout(60); // the time in seconds to wait for the user to configure the device
 
@@ -98,11 +97,12 @@ void setup() {
     while (1);
   }
 
+#ifdef WEBUPDATER_FEATURE
 #ifndef POWERSAVING
   setupWebUpdater();
-#endif
-
   localIP = WiFi.localIP().toString();
+#endif
+#endif
 
   delay(100);
 
@@ -111,7 +111,7 @@ void setup() {
 
   digitalWrite(STATUS_LED_PIN, LOW);
 
-  lowBatCheck();
+  criticalBatCheck();
 
   WiFi.mode(WIFI_OFF);
   WiFi.forceSleepBegin();
@@ -121,43 +121,66 @@ void setup() {
   delay(100);
 
 #endif
-
 }
 
 //*************************************************************************//
 
-void lowBatCheck()
-{
-  if (currentSensorData[SENSOR_BAT_VOLTAGE] <= BAT_LOW_VOLTAGE)
-  {
+void criticalBatCheck() {
+  if (currentSensorData[SENSOR_BAT_VOLTAGE] <= BAT_EMERGENCY_DEEPSLEEP_VOLTAGE) {
 #ifdef DEBUG
     Serial.println("Low battery, going into deep sleep.");
 #endif
-    ESP.deepSleep(4294967295); // battery low, shutting down
+    ESP.deepSleep(EMERGENCY_SLEEP_S * 1000000); // battery low, shutting down
     delay(100);
   }
 }
 
-void loop() {
+int energySavingMode() {
+  // Give the solar panel some time to load the cell to prevent
+  // flapping.
+  if (energySavingIterations > 0) {
+    energySavingIterations--;
+    return 1;
+  }
 
-  lowBatCheck();
+  // Is the battery low?
+  if (currentSensorData[SENSOR_BAT_VOLTAGE] <= BAT_LOW_VOLTAGE) {
+    // Entering energy saving
+    if (energySavingIterations == 0) {
+      energySavingIterations = ENERGY_SAVING_ITERATIONS;
+    }
+
+    return 1;
+  }
+    
+  return 0;
+}
+
+void loop() {
+  criticalBatCheck();
 
 #ifdef POWERSAVING
   delay(50);
   return;
 #endif
 
+#ifdef WEBUPDATER_FEATURE
   if (UPDATE_WEBSERVER_INTVERVAL_S * 1000 / DELAY_LOOP_MS <= update_webserver_cnt) {
     update_webserver_cnt = 0;
     doWebUpdater();
   }
+#endif
 
   _loop();
 
   delay(DELAY_LOOP_MS);
 
+
   update_sensor_cnt++;
+
+#ifdef WEBUPDATER_FEATURE
   update_webserver_cnt++;
+#endif
 }
 
 void _loop() {
@@ -170,7 +193,13 @@ void _loop() {
     currentSensorData[SENSOR_TEMPERATURE] = fetchTemperature();
     currentSensorData[SENSOR_HUMIDITY]    = fetchHumidity();
     currentSensorData[SENSOR_LIGHT]       = fetchLight();
-    currentSensorData[SENSOR_WINDSPEED]   = fetchWindspeed();
+
+    // Disable expensive tasks
+    if (energySavingMode() == 0) {
+      currentSensorData[SENSOR_WINDSPEED]   = fetchWindspeed();
+    } else {
+      currentSensorData[SENSOR_WINDSPEED]   = -1;
+    }
     currentSensorData[SENSOR_PRESSURE]    = fetchPressure();
     currentSensorData[SENSOR_BAT_VOLTAGE] = getBatteryVoltage();
 
@@ -188,13 +217,14 @@ void _loop() {
     delay(100);
 
     pushToInfluxDB(DEVICE_NAME, currentSensorData);
-
+    
+#ifdef WEBUPDATER_FEATURE
 #ifndef POWERSAVING
     setSensorData(DEVICE_NAME, localIP, currentSensorData);
   }
 #endif
+#endif
 
 }
 
 //*************************************************************************//
-