v1.0.4

examples/Example4_ReadVoltageCurrentRMS/Example4_ReadVoltageCurrentRMS.ino

@@ -0,0 +1,57 @@
+/*
+  Library for the Allegro MicroSystems ACS37800 power monitor IC
+  By: Paul Clark
+  SparkFun Electronics
+  Date: December 4th, 2021
+  License: please see LICENSE.md for details
+
+  Feel like supporting our work? Buy a board from SparkFun!
+  https://www.sparkfun.com/products/17873
+*/
+
+#include "SparkFun_ACS37800_Arduino_Library.h" // Click here to get the library: http://librarymanager/All#SparkFun_ACS37800
+#include <Wire.h>
+
+ACS37800 mySensor; //Create an object of the ACS37800 class
+
+void setup()
+{
+  Serial.begin(115200);
+  Serial.println(F("ACS37800 Example"));
+
+  Wire.begin();
+
+  //mySensor.enableDebugging(); // Uncomment this line to print useful debug messages to Serial
+
+  //Initialize sensor using default I2C address
+  if (mySensor.begin() == false)
+  {
+    Serial.print(F("ACS37800 not detected. Check connections and I2C address. Freezing..."));
+    while (1)
+      ; // Do nothing more
+  }
+
+  // From the ACS37800 datasheet:
+  // CONFIGURING THE DEVICE FOR AC APPLICATIONS : DYNAMIC CALCULATION OF N
+  // Set bypass_n_en = 0 (default). This setting enables the device to
+  // dynamically calculate N based off the voltage zero crossings.
+  mySensor.setBypassNenable(false, false); // Disable bypass_n in shadow memory and eeprom
+
+  // We need to connect the LO pin to the 'low' side of the AC source.
+  // So we need to set the divider resistance to 4M Ohms (instead of 2M).
+  mySensor.setDividerRes(4000000);
+}
+
+void loop()
+{
+  float volts = 0.0;
+  float amps = 0.0;
+
+  mySensor.readRMS(&volts, &amps); // Read the RMS voltage and current
+  Serial.print(F("Volts: "));
+  Serial.print(volts, 2);
+  Serial.print(F(" Amps: "));
+  Serial.println(amps, 2);
+
+  delay(250);
+}

library.properties

@@ -1,5 +1,5 @@
 name=SparkFun ACS37800 Power Monitor Arduino Library
-version=1.0.3
+version=1.0.4
 author=SparkFun Electronics
 maintainer=SparkFun Electronics
 sentence=Library for the Allegro MicroSystems ACS37800 power monitor IC

src/SparkFun_ACS37800_Arduino_Library.cpp

@@ -578,7 +578,7 @@ ACS37800ERR ACS37800::readRMS(float *vRMS, float *iRMS)
     _debugPort->print(F("readRMS: amps (A, before correction) is "));
     _debugPort->println(amps);
   }
-  amps /= 27500.0; //Convert from codes to the fraction of ADC Full Scale (15-bit)
+  amps /= 55000.0; //Convert from codes to the fraction of ADC Full Scale (16-bit)
   amps *= _currentSensingRange; //Convert to Amps
   if (_printDebug == true)
   {