Arduino Project

in Arduino Lessons

Lesson 14 Arduino Capacitor Meter

Lesson 14 Arduino Capacitor Meter More

in Arduino Lessons

Arduino Capacitor Meter Theory

Arduino Capacitor Meter Theory More

in Code Examples

Lesson 13 Resistor Meter code

// By Roee Bloch  Resistor-Meter
//All right Reserved
// Copyright (c) 2015 All Right Reserved, http://www.electronics-freak.com
//
// This source is subject to the Roee Bloch License.
// Please see the License.txt file for more information.
// All other rights reserved.
//
// THIS CODE AND INFORMATION ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
// KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
// PARTICULAR PURPOSE.
//
// </copyright>
// <author>Roee Bloch</author>
// <email>roeebloch@walla.co.il</email>
// <date>June 2015</date>
/*
Part of the CODE is LCD Taken from:

 Library originally added 18 Apr 2008
 by David A. Mellis
 library modified 5 Jul 2009
 by Limor Fried (http://www.ladyada.net)
 example added 9 Jul 2009
 by Tom Igoe
 modified 22 Nov 2010
 by Tom Igoe

 Formulas in use are:
 R(measured) = (RKnown(VCC-Vmeasured))/VMeasured
 V(measured) = ((ADC VALUE)/1024)*VCC

*/

#include <LiquidCrystal.h>

#define analog_in 1 // define analog input pin in use
#define VCC 5 //define VCC for calculation
#define R_known 46700 // define Reference resistor in use, I have found this value is very good to many measurements, but if you have another resistor you may change this value according
float R_measured, V_measured, R_measK ;
int analog_read;
char flag = 0;

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(8, 9, 4, 5, 6, 7);

void setup()
{
  Serial.begin(57600);
  Serial.println("Starting");
  lcd.begin(16, 2);
  lcd.print("Resistor Meter");
}
void loop()
{
  analog_read = analogRead(analog_in);
  while (analog_read == 0) {
    if (0 == flag)
    {
      Serial.println("Please connect resistor");
      lcd.setCursor(0, 1);
      lcd.print("Connect Resistor");
      flag = 1;
    }
    analog_read = analogRead(analog_in);
  }
  flag = 0;  // this is in order to print message connect resistor once only!
  V_measured = (analog_read) * VCC; // this is voltage *1024 since we did not divide by 1024
  V_measured = V_measured / 1024.0;
  R_measured = (R_known * (VCC - V_measured)) / V_measured;
  if (R_measured <= 1000)
  {
    Serial.print("Resistor is:");
    Serial.print(R_measured);
    Serial.println(" ohms");
    myclear();
    lcd.setCursor(0, 1);
    lcd.print("R=");
    lcd.print(R_measured);
    lcd.print(" ohms");
  }
  if (R_measured > 1000)
  {
    Serial.print("Resistor is:");
    R_measK = R_measured / 1000;
    Serial.print((R_measK));
    Serial.println(" K ohms");
    myclear();
    lcd.setCursor(0, 1);
    lcd.print("R=");
    lcd.print(R_measK);
    lcd.print(" K ohms");
  }
  delay(1000);
}
void myprint(float x, String param)
{
  int myprint;
  myprint = (x);
  Serial.print(param);
  Serial.print(" is:");
  Serial.println(myprint);
}
void myclear() // clear all second line
{
  lcd.setCursor(0, 1);
  lcd.print("                ");

}

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// By Roee Bloch Resistor-Meter

//

// This source is subject to the Roee Bloch License.

// Please see the License.txt file for more information.

// All other rights reserved.

//

// THIS CODE AND INFORMATION ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY

// KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE

// IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A

// PARTICULAR PURPOSE.

//

// </copyright>

// <author>Roee Bloch</author>

// <email>roeebloch@walla.co.il</email>

// <date>June 2015</date>

/*

Part of the CODE is LCD Taken from:

Library originally added 18 Apr 2008

by David A. Mellis

library modified 5 Jul 2009

by Limor Fried (http://www.ladyada.net)

example added 9 Jul 2009

by Tom Igoe

modified 22 Nov 2010

by Tom Igoe

Formulas in use are:

R(measured) = (RKnown(VCC-Vmeasured))/VMeasured

V(measured) = ((ADC VALUE)/1024)*VCC

*/

#include <LiquidCrystal.h>

#define analog_in 1 // define analog input pin in use

#define VCC 5 //define VCC for calculation

#define R_known 46700 // define Reference resistor in use, I have found this value is very good to many measurements, but if you have another resistor you may change this value according

float R_measured, V_measured, R_measK ;

int analog_read;

char flag = 0;

// initialize the library with the numbers of the interface pins

LiquidCrystal lcd(8, 9, 4, 5, 6, 7);

void setup()

{

Serial.begin(57600);

Serial.println("Starting");

lcd.begin(16, 2);

lcd.print("Resistor Meter");

}

void loop()

{

analog_read = analogRead(analog_in);

while (analog_read == 0) {

if (0 == flag)

{

Serial.println("Please connect resistor");

lcd.setCursor(0, 1);

lcd.print("Connect Resistor");

flag = 1;

}

analog_read = analogRead(analog_in);

}

flag = 0; // this is in order to print message connect resistor once only!

V_measured = (analog_read) * VCC; // this is voltage *1024 since we did not divide by 1024

V_measured = V_measured / 1024.0;

R_measured = (R_known * (VCC - V_measured)) / V_measured;

if (R_measured <= 1000)

{

Serial.print("Resistor is:");

Serial.print(R_measured);

Serial.println(" ohms");

myclear();

lcd.setCursor(0, 1);

lcd.print("R=");

lcd.print(R_measured);

lcd.print(" ohms");

}

if (R_measured > 1000)

{

Serial.print("Resistor is:");

R_measK = R_measured / 1000;

Serial.print((R_measK));

Serial.println(" K ohms");

myclear();

lcd.setCursor(0, 1);

lcd.print("R=");

lcd.print(R_measK);

lcd.print(" K ohms");

}

delay(1000);

}

void myprint(float x, String param)

{

int myprint;

myprint = (x);

Serial.print(param);

Serial.print(" is:");

Serial.println(myprint);

}

void myclear() // clear all second line

{

lcd.setCursor(0, 1);

lcd.print(" ");

}

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