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