add commands

src/main.cpp

@@ -1,7 +1,6 @@
 #include <Arduino.h>
 #include <Homie.h>
 
-
 /*
  * Wemos d1 mini
  * Flash Size: 4M (1M SPIFFS)
@@ -10,7 +9,9 @@
 //Upload config: platformio run --target uploadfs
 
 
+
 #include "HX711.h"
+#define SCALE_CALIBRATION 23805 //calibrated with 2.25kg weight. devide adc reading by calibration weight (in kg) to get this value (or other way around)
 
 // HX711 circuit wiring
 const int LOADCELL_DOUT_PIN = D2;
@@ -46,6 +47,8 @@ int sort_desc(const void *cmp1, const void *cmp2);
 float getFilteredWeight();
 float getWeightSpread();
 void sendWeight(float w);
+bool cmdHandler(const HomieRange& range, const String& value);
+void powerOff();
 
 
 void setup() {
@@ -68,7 +71,7 @@ void setup() {
   scaleNode.advertise("raw");
   scaleNode.advertise("max");
 
-  
+  scaleNode.advertise("CMD").settable(cmdHandler);  //function inputHandler gets called on new message on topic/input/set  
 
   Homie.setup();
 
@@ -78,7 +81,8 @@ void setup() {
 
   //calibration
   Serial.println("setup");
-  scale.set_scale(23805); //calibrated with 2.25kg weight
+  
+  scale.set_scale(SCALE_CALIBRATION);
   delay(500);
   scale.tare();
   delay(2000);
@@ -144,6 +148,7 @@ void loopHandler() {
       weight_read[weight_read_pos]=weight_current; //one reading takes 91ms
     } else {
         Serial.println("HX711 not found.");
+        scaleNode.setProperty("cmd").send("HX711 not found"); //can be done in main loop
     }
       
     float weight_filtered=getFilteredWeight();
@@ -184,16 +189,11 @@ void loopHandler() {
         sendWeight(weight_max-weight_tare);
       }
     }
-    
-
   }
 
   #define STAYONTIME_AFTER_SENT 5000
   if (millis() > MAXONTIME || (weight_sent && millis()>weight_sent_time+STAYONTIME_AFTER_SENT)) {
-    Serial.println("Turning Off");
-    Serial.flush();
-    delay(100);
-    digitalWrite(PIN_SELFENABLE, LOW);
+    powerOff();
   }
 
 
@@ -253,4 +253,49 @@ void sendWeight(float w) {
   weight_sent=true;
   weight_sent_time=millis();
   Serial.print("Weight sent="); Serial.println(w,3);
+}
+
+
+bool cmdHandler(const HomieRange& range, const String& value) {
+  if (range.isRange) {
+    return false; //if range is given but index is not in allowed range
+  }
+  Homie.getLogger() << "cmd" << ": " << value << endl;
+  
+  
+  //boolean value
+  if (value=="reset") {
+    if (scale.wait_ready_timeout(1000)) { //for non blocking mode
+      scale.set_scale(0);
+      scale.tare();
+      scaleNode.setProperty("cmd").send("tared");
+    } else {
+      Serial.println("HX711 not found.");
+      scaleNode.setProperty("cmd").send("HX711 not found");
+    }
+    
+  }if (value=="adc") {
+    if (scale.wait_ready_timeout(1000)) { //for non blocking mode
+      scaleNode.setProperty("cmd").send("adc="+scale.read_average(20));
+    } else {
+      Serial.println("HX711 not found.");
+      scaleNode.setProperty("cmd").send("HX711 not found");
+    }
+    
+  }if (value=="off") {
+    powerOff();    
+    scaleNode.setProperty("cmd").send("shutting down");
+  } else {
+    Homie.getLogger() << "cmd not recognized" << endl;
+    return false;  
+  }
+
+  return true;
+}
+
+void powerOff() {
+  Serial.println("Turning Off");
+  Serial.flush();
+  delay(100);
+  digitalWrite(PIN_SELFENABLE, LOW);
 }