first commit

HALL_EFFECT_2/HALL_EFFECT_2.ino

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+/*
+Measuring AC Current Using ACS712
+www.circuits4you.com
+*/
+const int sensorIn = A0;
+int mVperAmp = 66; // 185 pour 5, use 100 for 20A Module and 66 for 30A Module
+
+double Voltage = 0;
+double VRMS = 0;
+double AmpsRMS = 0;
+
+void setup(){ 
+ Serial.begin(9600);
+}
+
+void loop(){
+
+ Voltage = getVPP();
+ Serial.print(Voltage);
+ Serial.print(" mv ");
+ VRMS = (Voltage/2.0) *0.707;  //root 2 is 0.707
+ AmpsRMS = (VRMS * 1000)/mVperAmp;
+ Serial.print(AmpsRMS);
+ Serial.println(" Amps RMS");
+}
+
+float getVPP()
+{
+  float result;
+  int readValue;             //value read from the sensor
+  int maxValue = 0;          // store max value here
+  int minValue = 1024;          // store min value here
+  
+   uint32_t start_time = millis();
+   while((millis()-start_time) < 1000) //sample for 1 Sec
+   {
+       readValue = analogRead(sensorIn);
+       // see if you have a new maxValue
+       if (readValue > maxValue) 
+       {
+           /*record the maximum sensor value*/
+           maxValue = readValue;
+       }
+       if (readValue < minValue) 
+       {
+           /*record the minimum sensor value*/
+           minValue = readValue;
+       }
+   }
+   
+   // Subtract min from max
+   result = ((maxValue - minValue) * 5.0)/1024.0 -0.06;
+      
+   return result;
+ }