Measuring The Capacitor Range With Arduino Mega 2560

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Measuring The Capacitor Range With Arduino Mega 2560

Introduction

In this article, I will explain about measuring the Capacitor Range with Arduino Mega 2560.
It can simply measure the capacitor range in the serial monitor.

Parts List

Arduino Mega 2560
Capacitor
Hookup Wires
Bread Board

Capacitor

A capacitor (originally known as a condenser) is a passive two-terminal electrical component.
It is used to store electrical energy temporarily in an electric field.
In the two-terminal, it can have a positive and negative terminal

Figure 1: Capacitor

Connection

Step 1: Connecting From Arduino to a capacitor.

Connect the postive terminal to the digital pin of A1 to the board
Connect the negative terminal to the A0 of the board

Programming

const int OUT_PIN = A1;
const int IN_PIN = A0;
//Capacitance between IN_PIN and Ground
//Stray capacitance is always present. Extra capacitance can be added to
//allow higher capacitance to be measured.
const float IN_STRAY_CAP_TO_GND = 24.48; //initially this was 30.00
const float IN_EXTRA_CAP_TO_GND = 0.0;
const float IN_CAP_TO_GND = IN_STRAY_CAP_TO_GND + IN_EXTRA_CAP_TO_GND;
const int MAX_ADC_VALUE = 1023;
void setup()
{
pinMode(OUT_PIN, OUTPUT);
//digitalWrite(OUT_PIN, LOW); //This is the default state for outputs
pinMode(IN_PIN, OUTPUT);
//digitalWrite(IN_PIN, LOW);
Serial.begin(9600);
}
void loop()
{
//Capacitor under test between OUT_PIN and IN_PIN
//Rising high edge on OUT_PIN
pinMode(IN_PIN, INPUT);
digitalWrite(OUT_PIN, HIGH);
int val = analogRead(IN_PIN);
//Clear everything for next measurement digitalWrite(OUT_PIN, LOW);
pinMode(IN_PIN, OUTPUT);
//Calculate and print result
float capacitance = (float) val * IN_CAP_TO_GND /
(float)(MAX_ADC_VALUE - val);
Serial.print(F("Capacitance Value = "));
Serial.print(capacitance, 3);
Serial.print(F(" pF ("));
Serial.print(val);
Serial.println(F(") "));
while (millis() % 500 != 0);
}

Explanation

In this article, I explained about measuring the range of the capacitor.
It can print the value in the serial monitor.

Output

Figure 2: Output