v5.7.1b - Add timeout to some sensors

5.7.1b
 * Add timeout to DHT and DS18B20 sensors (#852)

README.md

@@ -1,7 +1,7 @@
 ## Sonoff-Tasmota
 Provide ESP8266 based Sonoff by [iTead Studio](https://www.itead.cc/) and ElectroDragon IoT Relay with Serial, Web and MQTT control allowing 'Over the Air' or OTA firmware updates using Arduino IDE.
 
-Current version is **5.7.1a** - See [sonoff/_releasenotes.ino](https://github.com/arendst/Sonoff-Tasmota/blob/development/sonoff/_releasenotes.ino) for change information.
+Current version is **5.7.1b** - See [sonoff/_releasenotes.ino](https://github.com/arendst/Sonoff-Tasmota/blob/development/sonoff/_releasenotes.ino) for change information.
 
 ### ATTENTION All versions
 

sonoff/_releasenotes.ino

@@ -1,4 +1,7 @@
-/* 5.7.1a
+/* 5.7.1b
+ * Add timeout to DHT and DS18B20 sensors (#852)
+ *
+ * 5.7.1a
  * Fix Domoticz loop when Emulation is selected
  * Add GPIO14 to Sonoff Dual (#797, #839)
  * Add support for Witty Cloud (#794)

sonoff/sonoff.ino

@@ -25,7 +25,7 @@
     - Select IDE Tools - Flash Size: "1M (no SPIFFS)"
   ====================================================*/
 
-#define VERSION                0x05070101  // 5.7.1a
+#define VERSION                0x05070102  // 5.7.1b
 
 enum log_t   {LOG_LEVEL_NONE, LOG_LEVEL_ERROR, LOG_LEVEL_INFO, LOG_LEVEL_DEBUG, LOG_LEVEL_DEBUG_MORE, LOG_LEVEL_ALL};
 enum week_t  {Last, First, Second, Third, Fourth};

sonoff/xsns_dht.ino

@@ -38,7 +38,7 @@ struct DHTSTRUCT {
   byte     type;
   char     stype[10];
   uint32_t lastreadtime;
-  bool     lastresult;
+  uint16_t lastresult;
   float    t;
   float    h = 0;
 } dht[DHT_MAX_SENSORS];
@@ -62,14 +62,14 @@ uint32_t dht_expectPulse(byte sensor, bool level)
   return count;
 }
 
-boolean dht_read(byte sensor)
+void dht_read(byte sensor)
 {
   char log[LOGSZ];
   uint32_t cycles[80];
   uint32_t currenttime = millis();
 
   if ((currenttime - dht[sensor].lastreadtime) < 2000) {
-    return dht[sensor].lastresult;
+    return;
   }
   dht[sensor].lastreadtime = currenttime;
 
@@ -89,13 +89,13 @@ boolean dht_read(byte sensor)
   delayMicroseconds(10);
   if (0 == dht_expectPulse(sensor, LOW)) {
     addLog_P(LOG_LEVEL_DEBUG, PSTR(D_LOG_DHT D_TIMEOUT_WAITING_FOR " " D_START_SIGNAL_LOW " " D_PULSE));
-    dht[sensor].lastresult = false;
-    return dht[sensor].lastresult;
+    dht[sensor].lastresult++;
+    return;
   }
   if (0 == dht_expectPulse(sensor, HIGH)) {
     addLog_P(LOG_LEVEL_DEBUG, PSTR(D_LOG_DHT D_TIMEOUT_WAITING_FOR " " D_START_SIGNAL_HIGH " " D_PULSE));
-    dht[sensor].lastresult = false;
-    return dht[sensor].lastresult;
+    dht[sensor].lastresult++;
+    return;
   }
   for (int i = 0; i < 80; i += 2) {
     cycles[i]   = dht_expectPulse(sensor, LOW);
@@ -108,8 +108,8 @@ boolean dht_read(byte sensor)
     uint32_t highCycles = cycles[2*i+1];
     if ((0 == lowCycles) || (0 == highCycles)) {
       addLog_P(LOG_LEVEL_DEBUG, PSTR(D_LOG_DHT D_TIMEOUT_WAITING_FOR " " D_PULSE));
-      dht[sensor].lastresult = false;
-      return dht[sensor].lastresult;
+      dht[sensor].lastresult++;
+      return;
     }
     dht_data[i/8] <<= 1;
     if (highCycles > lowCycles) {
@@ -122,12 +122,11 @@ boolean dht_read(byte sensor)
   addLog(LOG_LEVEL_DEBUG, log);
 
   if (dht_data[4] == ((dht_data[0] + dht_data[1] + dht_data[2] + dht_data[3]) & 0xFF)) {
-    dht[sensor].lastresult = true;
+    dht[sensor].lastresult = 0;
   } else {
     addLog_P(LOG_LEVEL_DEBUG, PSTR(D_LOG_DHT D_CHECKSUM_FAILURE));
-    dht[sensor].lastresult = false;
+    dht[sensor].lastresult++;
   }
-  return dht[sensor].lastresult;
 }
 
 boolean dht_readTempHum(byte sensor, float &t, float &h)
@@ -136,11 +135,16 @@ boolean dht_readTempHum(byte sensor, float &t, float &h)
     t = NAN;
     h = NAN;
   } else {
+    if (dht[sensor].lastresult > 8) {  // Reset after 8 misses
+      dht[sensor].t = NAN;
+      dht[sensor].h = NAN;
+    }
     t = dht[sensor].t;
     h = dht[sensor].h;
   }
 
-  if (dht_read(sensor)) {
+  dht_read(sensor);
+  if (!dht[sensor].lastresult) {
     switch (dht[sensor].type) {
     case GPIO_DHT11:
       h = dht_data[0];
@@ -193,7 +197,8 @@ void dht_init()
 
   for (byte i = 0; i < dht_sensors; i++) {
     pinMode(dht[i].pin, INPUT_PULLUP);
-    dht[i].lastreadtime = -MIN_INTERVAL;
+    dht[i].lastreadtime -= MIN_INTERVAL;
+    dht[i].lastresult = 0;
     switch (dht[i].type) {
     case GPIO_DHT11:
       strcpy_P(dht[i].stype, PSTR("DHT11"));

sonoff/xsns_ds18b20.ino

@@ -25,6 +25,7 @@
 \*********************************************************************************************/
 
 float dsb_mt = 0;
+uint16_t dsb_lastresult = 0;
 
 uint8_t dsb_reset()
 {
@@ -131,6 +132,10 @@ boolean dsb_readTemp(float &t)
   if (!dsb_mt) {
     t = NAN;
   } else {
+    dsb_lastresult++;
+    if (dsb_lastresult > 8) {  // Reset after 8 misses
+      dsb_mt = NAN;
+    }
     t = dsb_mt;
   }
 
@@ -168,8 +173,11 @@ boolean dsb_readTemp(float &t)
       sign = -1;
     }
     t = convertTemp((float)sign * DSTemp * 0.0625);
+    dsb_lastresult = 0;
+  }
+  if (!isnan(t)) {
+    dsb_mt = t;
   }
-  if (!isnan(t)) dsb_mt = t;
   return !isnan(t);
 }