Arduino Measures Current from Constant Current Source
Open above schematic. Schematic Arduino Current Measurement.
This is a continuing series on Arduino projects. This circuit enables Arduino to measure current from the constant current source projects below.
Also see Arduino Controlled Power Constant Current Source.
I used two parallel 0.5 Ohm resistors for 0.25 Ohms. The small voltage from resistors is amplified by an LM358 op-amp. Gain is set by R2 / R1.
An RC filter of 4.7K resistor and 10uF capacitor enable measurement of DC current or pule-width-modulated current from Arduino PWM from digital pin 9.The test program for an I2C LCD display and serial monitor.
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
//set the LCD address to 0x27 for a 16 chars and 2 line display
#define pwmPin 9
#define pot 0
#define analog1 1
int analogValue = 0; // variable to hold the analog value
int total, average;
float volts;
void setup() {
// open the serial port at 9600 bps:
Serial.begin(9600);
lcd.init();
lcd.backlight();
}
void loop() {
// read the analog input on pin 0:
analogValue = analogRead(0) ;
Serial.print("Pot value = ");
Serial.print(analogValue);
Serial.print("\n");
analogWrite(pwmPin, analogValue / 4);
analogValue = analogRead(pot);
lcd.setCursor(0, 0);
lcd.print("POT = ");
lcd.setCursor(6, 0);
lcd.print(analogValue);
analogValue = analogRead(analog1);
lcd.setCursor(0, 1);
lcd.print("AMPs = ");
lcd.setCursor(11, 1);
lcd.print(analogValue * .00467 );
Serial.print("AMPs = ");
Serial.print(analogValue * .00475);
Serial.print("\n");
delay(500);
}
New for 2021
Date: 7-11-2021
In the process of publishing new gadgets and circuit ideas. Plus new tutorials and videos. They will be published here on this site.
- List of Electronic Projects by Lewis Loflin
- Constant Current Source Theory Testing
- Arduino Measures Current from Constant Current Source
- Review Ohm's Law for Trouble-Shooting CCS Circuits
- Arduino Power Magnetic Driver Board for Stepper Motors
- Arduino Controlled Power Constant Current Source
- Theory and Operation of Capacitors
Related video to above:
- Constant Current Source Multimeter Trouble Shooting
- Ohm's Law Review for Constant Current Source
- Arduino Unipolar Stepper Motor Driver Board with Arduino Code
- Arduino Controlled Constant Current Source
- Related to above:
- Using a Unipolar Stepper Motor with a Arduino
- ULN2003A Darlington Transistor Array with Circuit Examples
- Tutorial Using TIP120 and TIP125 Power Darlington Transistors
- YouTube
- ULN2003A Transistor Array with Arduino
- Arduino Stepper Motor Control
- Using the TIP120 & TIP125 Darlington Transistors with Arduino
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- Understanding Xenon Flashtubes and Circuits
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- 3-Wire MAX6675 Thermocouple ADC Arduino Interface
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