Explicitly set active mode for PM sensor upon initialization

examples/OneOpenAir/OneOpenAir.ino

@@ -697,7 +697,7 @@ static void oneIndoorInit(void) {
   ledBarEnabledUpdate();
 
   /** Show message init sensor */
-  oledDisplay.setText("Sensor", "initializing...", "");
+  oledDisplay.setText("Monitor", "initializing...", "");
 
   /** Init sensor SGP41 */
   if (sgp41Init() == false) {
@@ -778,27 +778,27 @@ static void openAirInit(void) {
     }
   }
 
-  /** Try to find the PMS on other difference port with S8 */
+  /** Attempt to detect PM sensors */
   if (fwMode == FW_MODE_O_1PST) {
     bool pmInitSuccess = false;
     if (serial0Available) {
       if (ag->pms5003t_1.begin(Serial0) == false) {
         configuration.hasSensorPMS1 = false;
-        Serial.println("PMS1 sensor not found");
+        Serial.println("No PM sensor detected on Serial0");
       } else {
         serial0Available = false;
         pmInitSuccess = true;
-        Serial.println("Found PMS 1 on Serial0");
+        Serial.println("Detected PM 1 on Serial0");
       }
     }
     if (pmInitSuccess == false) {
       if (serial1Available) {
         if (ag->pms5003t_1.begin(Serial1) == false) {
           configuration.hasSensorPMS1 = false;
-          Serial.println("PMS1 sensor not found");
+          Serial.println("No PM sensor detected on Serial1");
         } else {
           serial1Available = false;
-          Serial.println("Found PMS 1 on Serial1");
+          Serial.println("Detected PM 1 on Serial1");
         }
       }
     }
@@ -806,15 +806,15 @@ static void openAirInit(void) {
   } else {
     if (ag->pms5003t_1.begin(Serial0) == false) {
       configuration.hasSensorPMS1 = false;
-      Serial.println("PMS1 sensor not found");
+      Serial.println("No PM sensor detected on Serial0");
     } else {
-      Serial.println("Found PMS 1 on Serial0");
+      Serial.println("Detected PM 1 on Serial0");
     }
     if (ag->pms5003t_2.begin(Serial1) == false) {
       configuration.hasSensorPMS2 = false;
-      Serial.println("PMS2 sensor not found");
+      Serial.println("No PM sensor detected on Serial1");
     } else {
-      Serial.println("Found PMS 2 on Serial1");
+      Serial.println("Detected PM 2 on Serial1");
     }
 
     if (fwMode == FW_MODE_O_1PP) {

src/AgOledDisplay.cpp

@@ -519,7 +519,7 @@ void OledDisplay::showRebooting(void) {
     do {
       DISP()->setFont(u8g2_font_t0_16_tf);
       // setCentralText(20, "Firmware Update");
-      setCentralText(40, "Reboot...");
+      setCentralText(40, "Rebooting...");
       // setCentralText(60, String("Retry after 24h"));
     } while (DISP()->nextPage());
   } else if (ag->isBasic()) {

src/AgWiFiConnector.cpp

@@ -72,7 +72,7 @@ bool WifiConnector::connect(void) {
   WIFI()->setSaveParamsCallback([this]() { _wifiSaveParamCallback(); });
   WIFI()->setConfigPortalTimeoutCallback([this]() {_wifiTimeoutCallback();});
   if (ag->isOne() || (ag->isPro4_2()) || ag->isPro3_3() || ag->isBasic()) {
-    disp.setText("Connect to", "WiFi", "...");
+    disp.setText("Connecting to", "WiFi", "...");
   } else {
     logInfo("Connecting to WiFi...");
   }

src/PMS/PMS.cpp

@@ -2,34 +2,48 @@
 #include "../Main/BoardDef.h"
 
 /**
- * @brief Init and check that sensor has connected
+ * @brief Initializes the sensor and attempts to read data.
  *
  * @param stream UART stream
  * @return true Sucecss
  * @return false Failure
  */
 bool PMSBase::begin(Stream *stream) {
+  Serial.printf("initializing PM sensor\n");
   this->stream = stream;
 
   failed = true;
   failCount = 0;
   lastRead = 0; // To read buffer on handle without wait after 1.5sec
 
-  this->stream->flush();
+  // empty first
+  int bytesCleared = 0;
+  while (this->stream->read() != -1) {
+    bytesCleared++;
+  }
+  Serial.printf("cleared %d byte(s)\n", bytesCleared);
+
+  // explicitly put the sensor into active mode, this seems to be be needed for the Cubic PM2009X
+  Serial.printf("setting active mode\n");
+  uint8_t activeModeCommand[] = { 0x42, 0x4D, 0xE1, 0x00, 0x01, 0x01, 0x71 };
+  size_t bytesWritten = this->stream->write(activeModeCommand, sizeof(activeModeCommand));
+  Serial.printf("%d byte(s) written\n", bytesWritten);
 
   // Run and check sensor data for 4sec
   while (1) {
     handle();
     if (failed == false) {
-      return true;
+      Serial.printf("PM sensor initialized\n");
+      return true; 
     }
 
-    delay(1);
+    delay(10);
     uint32_t ms = (uint32_t)(millis() - lastRead);
     if (ms >= 4000) {
       break;
     }
   }
+  Serial.printf("PM sensor initialization failed\n");
   return false;
 }
 

src/PMS/PMS.h

@@ -5,6 +5,9 @@
 
 #define PMS_FAIL_COUNT_SET_INVALID 3
 
+/**
+ * Known to work with these sensors: Plantower PMS5003, Plantower PMS5003, Cubic PM2009X
+ */
 class PMSBase {
 public:
   bool begin(Stream *stream);

src/PMS/PMS5003.cpp

@@ -38,14 +38,11 @@ bool PMS5003::begin(HardwareSerial &serial) {
 PMS5003::PMS5003(BoardType def) : _boardDef(def) {}
 
 /**
- * @brief Init sensor
+ * Initializes the sensor.
- *
- * @return true Success
- * @return false Failure
  */
 bool PMS5003::begin(void) {
   if (this->_isBegin) {
-    AgLog("Initialized, call end() then try again");
+    AgLog("Already initialized, call end() then try again");
     return true;
   }