bme280

src/BME280.cpp

@@ -22,13 +22,33 @@ bool BME280::begin(void) {
     if (retries > 5) break;
     retries++;
     Serial.println("Could not find a valid BME280 sensor, check wiring!");
-//    bme->reset();
     delay(500);
   }
   if (!valid) return false;
+
+  bme->setSampling(Adafruit_BME280::sensor_mode::MODE_NORMAL,
+                   Adafruit_BME280::sensor_sampling::SAMPLING_X16,
+                   Adafruit_BME280::sensor_sampling::SAMPLING_X16,
+                   Adafruit_BME280::sensor_sampling::SAMPLING_X16,
+                   Adafruit_BME280::sensor_filter::FILTER_OFF,
+                   Adafruit_BME280::standby_duration::STANDBY_MS_250);
+
   return true;
 }
 
+void BME280::sleep() {
+  bme->setSampling(Adafruit_BME280::sensor_mode::MODE_SLEEP,
+                   Adafruit_BME280::sensor_sampling::SAMPLING_X16,
+                   Adafruit_BME280::sensor_sampling::SAMPLING_X16,
+                   Adafruit_BME280::sensor_sampling::SAMPLING_X16,
+                   Adafruit_BME280::sensor_filter::FILTER_OFF,
+                   Adafruit_BME280::standby_duration::STANDBY_MS_1000);
+}
+
+void BME280::init() {
+  bme->init();
+}
+
 void BME280::printValues() {
     Serial.print("Temperature = ");
     Serial.print(bme->readTemperature());
@@ -50,6 +70,21 @@ void BME280::printValues() {
     Serial.println();
 }
 
-float BME280::readTemperature(void) { return bme->readTemperature(); }
-float BME280::readPressure(void) { return bme->readPressure() / 100.0F; }
-float BME280::readHumidity(void) { return bme->readHumidity(); }
+float BME280::readTemperature(void) {
+  float temp = bme->readTemperature();
+  if (temp < -40 || temp > 85) valid = false;
+  else valid = true;
+  return temp;
+}
+float BME280::readPressure(void) {
+  float p = bme->readPressure() / 100.0F;
+  if (p < 300 || p > 1100) valid = false;
+  else valid = true;
+  return p;
+}
+float BME280::readHumidity(void) {
+  float h = bme->readHumidity();
+  if (h < 0 || h > 100) valid = false;
+  else valid = true;
+  return h;
+}

src/BME280.h

@@ -18,10 +18,12 @@ class BME280 {
   public:
     BME280();
     bool begin(void);
+    void init(void);
     void printValues(void);
     float readTemperature(void);
     float readPressure(void);
     float readHumidity(void);
+    void sleep(void);
     bool valid;
   private:
     Adafruit_BME280 *bme;

src/main.cpp

@@ -194,6 +194,19 @@ void onMqttConnect(bool sessionPresent) {
 
 void transmitStatus() {
   DEBUG_PRINTLN(__func__);
+
+  float temp = bme280.readTemperature();
+  float humi = bme280.readHumidity();
+  float pres = bme280.readPressure();
+
+  for (int retry=0; retry<3 && !bme280.valid; retry++) {
+    bme280.init();
+    delay(250);
+    humi = bme280.readHumidity();
+    bme280.readPressure();
+    temp = bme280.readTemperature();
+  }
+
   StaticJsonBuffer<200> jsonBuffer;
   JsonObject& root = jsonBuffer.createObject();
   root["temperature"] = bme280.readTemperature();
@@ -229,6 +242,7 @@ void suspend(uint32_t secondsToSleep) {
 
   mp3.stop();
   led.stop();
+  bme280.sleep();
   delay(1000);
   u8g2.setPowerSave(1);