plausibility checks, eliminiate NOT_ATTACHED

mini-beieli-node.ino

@@ -527,9 +527,15 @@ void DoDeepSleep(uint32_t sleep_time)
   }
 }
 
-void ReadSensors(SENSOR_data &sensor_data) {
+// Returns true if measurements are plausible, otherwise false
+bool ReadSensors(SENSOR_data &sensor_data) {
+  bool plausible;
+  bool plausible_a;
+  bool plausible_b;
   SENSOR_data res;
   int32_t weight_current32;
+  int32_t weight_current32_a;
+  int32_t weight_current32_b;
   long w1_0_real;
   long w2_0_real;
 
@@ -547,30 +553,14 @@ void ReadSensors(SENSOR_data &sensor_data) {
     if (config_data.debug_level > 0) {
       gCatena.SafePrintf("LoadCell is ready.\n");
     }
-    if (config_data.cal_w1_0 != NOT_ATTACHED) {
     res.weight1 = (int32_t)ReadScale('A');
     if (config_data.debug_level > 0) {
       gCatena.SafePrintf("Load_cell 1 weight1_current: %ld\n", res.weight1);
     }
-    } else {
-      res.weight1 = 0;
-      w1_0_real = 0;
-      if (config_data.debug_level > 0) {
-        gCatena.SafePrintf("Load_cell 1 is disabled\n");
-      }
-    }
-    if (config_data.cal_w2_0 != NOT_ATTACHED) {
     res.weight2 = (int32_t)ReadScale('B');
     if (config_data.debug_level > 0) {
       gCatena.SafePrintf("Load_cell 2 weight2_current: %ld\n", res.weight2);
     }
-    } else {
-      res.weight2 = 0;
-      w2_0_real = 0;
-      if (config_data.debug_level > 0) {
-        gCatena.SafePrintf("Load_cell 2 is disabled\n");
-      }
-    }
   }
   else {
     if (config_data.debug_level > 0) {
@@ -582,18 +572,32 @@ void ReadSensors(SENSOR_data &sensor_data) {
   PowerdownScale();
 
   // Gewicht berechnen
-  weight_current32 = (int32_t)((((res.weight1 - w1_0_real) / config_data.cal_w1_factor) + ((res.weight2 - w2_0_real) / config_data.cal_w2_factor)) / 5.0);
+  weight_current32_a = (int32_t)((res.weight1 - w1_0_real) / config_data.cal_w1_factor);
+  weight_current32_b = (int32_t)((res.weight2 - w2_0_real) / config_data.cal_w2_factor);
+  weight_current32 = (int32_t)((weight_current32_a + weight_current32_b) / 5.0);
+
+  // we check if weights are plausible
+  plausible_a = (weight_current32_a > -10000) && (weight_current32_a < 150000);
+  plausible_b = (weight_current32_b > -10000) && (weight_current32_b < 150000);
+  plausible = (plausible_a && plausible_b);
 
   if (weight_current32 < 0) {
+    if (plausible) { 
       weight_current32 = 0;
+    } 
   } else if (weight_current32 > UINT16_MAX) {
     //weight_current32 = UINT16_MAX;
     // we set the weight to 0, as such high values are not realistic and probably a sign for bad calibration...
     weight_current32 = 0;
   }
-  if (config_data.cal_w1_0 == NOT_ATTACHED || config_data.cal_w2_0 == NOT_ATTACHED) {
+  if (!plausible) {
-    // when at least one load cell is disabled, we multiply the measured weight by 2
+    weight_current32 = NOT_PLAUSIBLE_16;
-    weight_current32 = weight_current32 * 2;
+    if (!plausible_a) {
+      res.weight1 = NOT_PLAUSIBLE_32;
+    }
+    if (!plausible_b) {
+      res.weight2 = NOT_PLAUSIBLE_32;
+    }
   }
   res.weight = (uint16_t)weight_current32;
 
@@ -621,6 +625,7 @@ void ReadSensors(SENSOR_data &sensor_data) {
   }
 
   sensor_data = res;
+  return plausible;
 }
 
 void StartNewIteration() {
@@ -632,7 +637,18 @@ void StartNewIteration() {
   iteration++;
 
   SENSOR_data current_sensor_reading;
-  ReadSensors(current_sensor_reading);
+  if (!ReadSensors(current_sensor_reading)) {
+    // we try a second time if Readings do not seem plausible
+    if (config_data.debug_level > 0) {
+      gCatena.SafePrintf("Readings do not seem plausible, try a second time\n");
+    }
+    delay(500);
+    if (!ReadSensors(current_sensor_reading)) {
+      if (config_data.debug_level > 0) {
+        gCatena.SafePrintf("Readings do not seem plausible for a second time, we give up!\n");
+      }
+    }
+  }
   int16_t temp_change;
 
   // vBus
@@ -1215,15 +1231,9 @@ cCommandStream::CommandStatus cmdCalibrateScaleA(cCommandStream * pThis, void *p
   String w1_gramm(argv[1]);
   long weight1;
 
-  if (w1_gramm == "NA") {
-    // scale a is not connected
-    config_data.cal_w1_factor = 1.0;
-    config_data.cal_w1_0 = NOT_ATTACHED;
-  } else {
   setup_scales();
   weight1 = ReadScale('A');
   config_data.cal_w1_factor = (float)((weight1 - config_data.cal_w1_0) / w1_gramm.toFloat());
-  }
 
   gCatena.getFram()->saveField(cFramStorage::kAppConf, (const uint8_t *)&config_data, sizeof(config_data));
 
@@ -1237,15 +1247,9 @@ cCommandStream::CommandStatus cmdCalibrateScaleB(cCommandStream * pThis, void *p
   String w2_gramm(argv[1]);
   long weight2;
 
-  if (w2_gramm == "NA") {
-    // scale b is not connected
-    config_data.cal_w2_factor = 1.0;
-    config_data.cal_w2_0 = NOT_ATTACHED;
-  } else {
   setup_scales();
   weight2 = ReadScale('B');
   config_data.cal_w2_factor = (float)((weight2 - config_data.cal_w2_0) / w2_gramm.toFloat());
-  }
 
   gCatena.getFram()->saveField(cFramStorage::kAppConf, (const uint8_t *)&config_data, sizeof(config_data));
 

mini_beieli_node.h

@@ -56,7 +56,7 @@ enum {
   |
   \****************************************************************************/
 
-static const int32_t fwVersion = 20200629;
+static const int32_t fwVersion = 20200701;
 
 static const byte INIT_PACKAGE_INTERVAL = 100;  // send an init package every 100 packages;
 static const byte MAX_VALUES_TO_SEND = 8;
@@ -65,7 +65,8 @@ static const uint8_t LORA_DATA_VERSION = 1;
 static const uint8_t LORA_DATA_VERSION_FIRST_PACKAGE = 128;
 static const uint32_t PRESSURE_OFFSET = 825;
 static const uint16_t SEND_DIFF_THRESHOLD_5GRAMS = 20;   // when weight changes by 100g, then send data
-static const long NOT_ATTACHED = -2147483648;
+static const long NOT_PLAUSIBLE_16 = 65535;
+static const long NOT_PLAUSIBLE_32 = 2147483647;
 static const byte INIT_PACKETS = 5;
 
 // must be 64 bytes long (size of kAppConf)

mini_beieli_node_nau7802.h

@@ -97,9 +97,11 @@ long ReadScale(char channel)
   for (int i = 0; i < num_scale_readings; i++) {
     //while (digitalRead(interruptPin) == LOW) {
     long mytimer = millis();
-    while (! myScale.available()) {
+    int timeouts = 0;
+    while (! myScale.available() && (timeouts < 3)) {
       // we set a timeout of 10 seconds for the measurement...
       if ((millis() - mytimer) > 10000) {
+        timeouts = timeouts + 1;
         // Timeout reading scale...
         Wire.endTransmission(true);
         delay(50);
@@ -107,7 +109,6 @@ long ReadScale(char channel)
         if (debug_level > 0) {
           gCatena.SafePrintf("Timeout while reading scale...\n");
         }
-        break;
       }
       delay(50);
     }