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--- documentation:microcontroleurs:arduino:modules:amperemetre_acs712:index [2018/08/03 01:18] – f1sls
+++ documentation:microcontroleurs:arduino:modules:amperemetre_acs712:index [2018/08/03 01:27] (Version actuelle) – f1sls
@@ Ligne 1: / Ligne 1: @@
 ====== Mesureur de courant ACS712 ======
+{{ :documentation:microcontroleurs:arduino:modules:amperemetre_acs712:acs-712-pinouts.png?direct |}}
+//image [[http://henrysbench.capnfatz.com]]//
 ===== Spécifications des 3 modèles (5, 20 et 30 A) =====
-<html>
+{{:documentation:microcontroleurs:arduino:modules:amperemetre_acs712:acs712_5a_20a_30a.png?direct|}}
-<table id="tablepress-3" class="tablepress tablepress-id-3">
-<thead>
+===== Exemple de code =====
-<tr class="row-1 odd">
+<code cpp>
-	<th class="column-1">&nbsp;</th><th class="column-2">5A Module</th><th class="column-3">20A Module</th><th class="column-4">30A Module</th>
+/*
-</tr>
+Measuring Current Using ACS712
-</thead>
+*/
-<tbody class="row-hover">
+const int analogIn = A0;
-<tr class="row-2 even">
+int mVperAmp = 185; // use 100 for 20A Module and 66 for 30A Module
-	<td class="column-1">Supply Voltage (VCC)</td><td class="column-2">5Vdc Nominal</td><td class="column-3">5Vdc Nominal</td><td class="column-4">5Vdc Nominal</td>
+int RawValue= 0;
-</tr>
+int ACSoffset = 2500;
-<tr class="row-3 odd">
+double Voltage = 0;
-	<td class="column-1">Measurement Range</td><td class="column-2">-5 to +5 Amps</td><td class="column-3">-20 to +20 Amps</td><td class="column-4">-30 to +30 Amps</td>
+double Amps = 0;
-</tr>
-<tr class="row-4 even">
+void setup(){
-	<td class="column-1">Voltage at 0A</td><td class="column-2">VCC/2<br>
+ Serial.begin(9600);
-(nominally 2.5Vdc)</td><td class="column-3">VCC/2<br>
+}
-(nominally 2.5Vdc)</td><td class="column-4">VCC/2<br>
-(nominally 2.5VDC)</td>
+void loop(){
-</tr>
-<tr class="row-5 odd">
+ RawValue = analogRead(analogIn);
-	<td class="column-1">Scale Factor</td><td class="column-2">185 mV per Amp</td><td class="column-3">100 mV per Amp</td><td class="column-4">66 mV per Amp</td>
+ Voltage = (RawValue / 1024.0) * 5000; // Gets you mV
-</tr>
+ Amps = ((Voltage - ACSoffset) / mVperAmp);
-<tr class="row-6 even">
-	<td class="column-1">Chip</td><td class="column-2">ACS712ELC-05A</td><td class="column-3">ACS712ELC-10A</td><td class="column-4">ACS712ELC-30A</td>
-</tr>
+ Serial.print("Raw Value = " ); // shows pre-scaled value
-</tbody>
+ Serial.print(RawValue);
-</table>
+ Serial.print("\t mV = "); // shows the voltage measured
-</html>
+ Serial.print(Voltage,3); // the '3' after voltage allows you to display 3 digits after decimal point
+ Serial.print("\t Amps = "); // shows the voltage measured
+ Serial.println(Amps,3); // the '3' after voltage allows you to display 3 digits after decimal point
+ delay(2500);
+}
+</code>
+===== Datasheet ACS712 =====
+{{ :documentation:microcontroleurs:arduino:modules:amperemetre_acs712:acs712-datasheet.pdf |}}

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