Make HM3301 Sleep Mode Usable

lib/HM330x/HM330x.cpp

@@ -30,13 +30,21 @@
 #include "HM330x.h"
 
 // Default Constructor
-HM330x::HM330x() {};
+HM330x::HM330x(uint8_t sp = 0) {
+  sleep_pin = sp;
+};
 
 // Initialize the Sensor
 void HM330x::initialize(void) {
   uint8_t retryCount = 0;
   DEBUG_PRINTLN("HM330x::initialize");
   
+  // Enable Sleep Mode if Pin is Configured
+  if (sleep_pin > 0) {
+    pinMode(sleep_pin, OUTPUT);
+    digitalWrite(sleep_pin, HIGH);
+  }
+
   // Wait for Sensor to get Ready
   DEBUG_PRINTLN("HM330x::initialize Waiting for Sensor Startup");
   delay(30000);
@@ -60,6 +68,12 @@ uint8_t HM330x::getSensorData(char *payload, uint8_t startbyte) {
   uint16_t value = 0;
 
   DEBUG_PRINTLN("HM330x::getSensorData");
+  
+  // Enable Sensor and Wait for it to Settle
+  if (sleep_pin > 0) {
+    digitalWrite(sleep_pin, HIGH);
+    delay(30000);
+  }
 
   // Initialize Payload with 0s
   for (uint8_t i=startbyte; i < startbyte+6; i++)
@@ -82,12 +96,18 @@ uint8_t HM330x::getSensorData(char *payload, uint8_t startbyte) {
         uint16ToPayload(value, payload, startbyte);
         startbyte += 2;
       }
+      if (sleep_pin > 0) {
+        digitalWrite(sleep_pin, LOW);
+      }
       return startbyte;
     } else {
       for (uint8_t i=startbyte; i < startbyte+6; i++)
         payload[i] = 0xEE;
     }
   }
+  if (sleep_pin > 0) {
+    digitalWrite(sleep_pin, LOW);
+  }
   return startbyte+6;
 }
 

lib/HM330x/HM330x.h

@@ -38,13 +38,13 @@
 
 class HM330x : public AttSensor {
   private:
+    uint8_t  sleep_pin = 0;
     bool     sendCmd(uint8_t cmd);
     uint8_t  calcSum(uint8_t bytes[]);
     uint16_t bytesToUint16(uint8_t bytes[], uint8_t pos);
 
   public:
-    HM330x();
-    HM330x(uint8_t interval, bool selfcalib);
+    HM330x(uint8_t sp = 0);
     void initialize(void);
     void calibrate(void) {};
     uint8_t numBytes(void) {return 6;};

src/config.h.example

@@ -66,11 +66,17 @@
  * Sensor Configuration
  * Change according to your Needs
  *************************************************************************************************************************/
+
 // Pin for the OneWire Bus
 #define DS18B20_PIN PIN_PC3
 // A/D Resolution of the DS18B20 (9-12 Bit)
 #define DS18B20_RES 12
 
+// Connect a free pin on the ATTNode to the SET-Pin on the HM3301-Board
+// Set HM330x_SLLEP_PIN to the choosen pin to enable the Sleep-Mode of the HM3301. 
+// Setting it to 0 disables Sleep Mode
+#define HM330x_SLEEP_PIN 0
+
 /**************************************************************************************************************************
  * How many minutes to sleep between Measuring/Sending
  * Since this is a 2-byte value internally, intervals between 1 and 65536 are possible

src/main.cpp

@@ -366,7 +366,7 @@ void setup()
     i++;
   #endif
   #ifdef HAS_HM330x
-    sensors[i] = new HM330x();
+    sensors[i] = new HM330x(HM330x_SLEEP_PIN);
     i++;
   #endif
   #ifdef HAS_DS18B20