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libraries/ACS712/examples/ACS712_I2C_display/ACS712_I2C_display.ino

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+//
+//    FILE: ACS712_20_AC.ino
+//  AUTHOR: Rob Tillaart
+// PURPOSE: demo AC measurement with point to point
+//     URL: https://github.com/RobTillaart/ACS712
+
+
+///////////////////////////////////////////////////////////////////
+//
+//  DISPLAY
+//
+#include <Wire.h>
+#include <LCD.h>
+#include <LiquidCrystal_I2C.h>
+
+#define BACKLIGHT_PIN   3
+#define En_pin          2
+#define Rw_pin          1
+#define Rs_pin          0
+#define D4_pin          4
+#define D5_pin          5
+#define D6_pin          6
+#define D7_pin          7
+
+#define BL_OFF          0
+#define BL_ON           1
+
+#define DISPLAY_ADDR    0x3F    //  check
+
+LiquidCrystal_I2C  lcd(DISPLAY_ADDR, En_pin, Rw_pin, Rs_pin, D4_pin, D5_pin, D6_pin, D7_pin);
+uint32_t lastDisplay = 0;
+
+
+
+#include "ACS712.h"
+
+
+//  Arduino UNO has 5.0 volt with a max ADC value of 1023 steps
+//  ACS712 5A  uses 185 mV per A
+//  ACS712 20A uses 100 mV per A
+//  ACS712 30A uses  66 mV per A
+
+
+ACS712  ACS(A0, 5.0, 1023, 185);
+//  ESP 32 example (might requires resistors to step down the logic voltage)
+//  ACS712  ACS(25, 3.3, 4095, 185);
+
+
+void setup()
+{
+  Serial.begin(115200);
+  while (!Serial);
+  Serial.println(__FILE__);
+  Serial.print("ACS712_LIB_VERSION: ");
+  Serial.println(ACS712_LIB_VERSION);
+
+  lcd.begin(16, 2);
+  lcd.setBacklightPin(BACKLIGHT_PIN, POSITIVE);
+  lcd.setBacklight(BL_ON);
+
+  lcd.clear();
+
+
+  ACS.autoMidPoint();
+
+}
+
+
+void loop()
+{
+  lcd.clear();
+
+  float f1 = ACS.mA_AC();
+  float f2 = ACS.mA_AC_sampling();
+
+  lcd.setCursor(0, 0);
+  lcd.print("mA: ");
+  lcd.print(f1, 1);
+
+  lcd.setCursor(10, 0);
+  lcd.print(f2, 1);
+
+  lcd.setCursor(0, 1);
+  lcd.print("FF: ");
+  lcd.print(f1 / f2);
+  delay(1000);
+}
+
+
+// -- END OF FILE --