make it more stable

mini-beieli-node.ino

@@ -677,7 +677,7 @@ void StartNewIteration() {
   // we send data the first time the system is started, when the array is full
   // or when the weight has fallen more than threshold or the first measurement is
   // more than one hour old (which should not happen :-) )
-  if ( (next_package_is_init_package) || (my_position >= MAX_VALUES_TO_SEND) || ((last_sensor_reading.weight - current_sensor_reading.weight) > SEND_DIFF_THRESHOLD_5GRAMS) || ((millis() - timer_pos0) > 3600000)) {
+  if ( (next_package_is_init_package) || (my_position >= MAX_VALUES_TO_SEND) || (abs(last_sensor_reading.weight - current_sensor_reading.weight) > SEND_DIFF_THRESHOLD_5GRAMS) || ((millis() - timer_pos0) > 3600000)) {
     lora_data.offset_last_reading = (uint8_t)((millis() - timer_pos0) / 1000 / 60);
     if (config_data.debug_level > 0) {
       gCatena.SafePrintf("startSendingUplink(), my_position: %d, iteration: %d, package_counter: %d\n", my_position, iteration, package_counter);
@@ -1023,6 +1023,7 @@ void doDeepSleep(osjob_t *pJob)
 void deepSleepPrepare(void)
 {
   Serial.end();
+  Wire.endTransmission(true);
   Wire.end();
   SPI.end();
   if (fFlash)
@@ -1112,8 +1113,6 @@ static void receiveMessage(void *pContext, uint8_t port, const uint8_t *pMessage
     float fval;
   } u;
 
-  SENSOR_data temp_sensor_data;
-
   if (config_data.debug_level > 0) {
     gCatena.SafePrintf("receiveMessage was called!!!\n");
   }

mini_beieli_node.h

@@ -56,7 +56,7 @@ enum {
   |
   \****************************************************************************/
 
-static const int32_t fwVersion = 20200523;
+static const int32_t fwVersion = 20200527;
 
 static const byte INIT_PACKAGE_INTERVAL = 100;  // send an init package every 100 packages;
 static const byte MAX_VALUES_TO_SEND = 8;
@@ -64,7 +64,7 @@ static const byte MAX_VALUES_TO_SEND = 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 = 10;   // when weight value drops by 50g, then send data
+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 byte INIT_PACKETS = 5;
 

mini_beieli_node_nau7802.h

@@ -8,8 +8,7 @@
 
 #include "SparkFun_Qwiic_Scale_NAU7802_Arduino_Library.h"
 
-#define SAMPLES 10
+#define SAMPLES 5
-#define IGNORE_READINGS 5
 
 NAU7802 myScale; //Create instance of the NAU7802 class
 
@@ -25,20 +24,17 @@ void SetScalesDebugLevel(byte dbg_level)
 bool InitializeScales()
 {
   bool result;
-  result &= myScale.reset(); //Reset all registers
+  result = myScale.reset(); //Reset all registers
   result &= myScale.powerUp(); //Power on analog and digital sections of the scale
 
-  // we wait 100 ms to give it time to stabilze
-  delay(100);
-
   result &= myScale.setIntPolarityHigh();
   result &= myScale.setLDO(NAU7802_LDO_3V3); //Set LDO to 3.3V
   result &= myScale.setGain(NAU7802_GAIN_128); //Set gain to 128
-  result &= myScale.setSampleRate(NAU7802_SPS_80); //Set samples per second to 10
+  result &= myScale.setSampleRate(NAU7802_SPS_40); //Set samples per second to 40
   result &= myScale.setRegister(NAU7802_ADC, 0x30); //Turn off CLK_CHP. From 9.1 power on sequencing.
   result &= myScale.clearBit(NAU7802_PGA_PWR_PGA_CAP_EN, NAU7802_PGA_PWR);
-  result &= myScale.setRegister(NAU7802_OTP_B1, 0x30);
+  //result &= myScale.setRegister(NAU7802_OTP_B1, 0x30);
-  result &= myScale.setRegister(NAU7802_PGA, NAU7802_PGA_OUT_EN | NAU7802_PGA_CHP_DIS);
+  //result &= myScale.setRegister(NAU7802_PGA, NAU7802_PGA_OUT_EN | NAU7802_PGA_CHP_DIS);
 
   result &= myScale.calibrateAFE(); //Re-cal analog front end when we change gain, sample rate, or channel
 
@@ -91,34 +87,19 @@ long ReadScale(char channel)
     }
   }
 
-  int32_t dummy;
+  if (myScale.available()) {
-  int const ignore_readings = IGNORE_READINGS; // number of first <n> readings to ignore
+    long dummy = myScale.getReading();
-  int const num_scale_readings = SAMPLES; // number of instantaneous scale readings to calculate the median
-
-  for (int i = 0; i < ignore_readings; i++) {
-    //while (digitalRead(interruptPin) == LOW) {
-    while (! myScale.available()) {
-      if ((millis() - startTime) > 60000) {
-        if (debug_level > 0) {
-          gCatena.SafePrintf("Timeout while reading scale (dummy values)...\n");
-        }
-        break;
-      }
-      delay(1);
-    }
-    dummy = myScale.getReading();
-    if (debug_level > 0) {
-      gCatena.SafePrintf("Dummy Reading int32_t: %d\n", dummy);
-    }
   }
+  int const num_scale_readings = SAMPLES; // number of instantaneous scale readings to calculate the median
 
   // we use the median, not the average, see https://community.particle.io/t/boron-gpio-provides-less-current-than-electrons-gpio/46647/13
   long readings[num_scale_readings];  // create arry to hold readings
   for (int i = 0; i < num_scale_readings; i++) {
     //while (digitalRead(interruptPin) == LOW) {
     while (! myScale.available()) {
-      // we set a timeout of 60 seconds for the measurement...
+      // we set a timeout of 10 seconds for the measurement...
-      if ((millis() - startTime) > 60000) {
+      if ((millis() - startTime) > 10000) {
+        Wire.endTransmission(true);
         if (debug_level > 0) {
           gCatena.SafePrintf("Timeout while reading scale...\n");
         }
@@ -126,11 +107,12 @@ long ReadScale(char channel)
       }
       delay(1);
     }
-    int32_t reading = myScale.getReading();
+    long reading = myScale.getReading();
     if (debug_level > 0) {
-      gCatena.SafePrintf("Reading int32_t: %d\n", reading);
+      gCatena.SafePrintf("Reading: %d\n", reading);
     }
-    readings[i] = long(reading);  // fill the array with instantaneous readings from the scale
+    readings[i] = reading;  // fill the array with instantaneous readings from the scale
+    delay(10);
   }
 
   long duration = millis() - startTime;