Lesson 13 Resistor Meter code
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// 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(" "); } |
Video Based on This Code: lesson-13-resistor-meter-part-2
Resistor Meter Theory of Operation: lesson-13-arduino-resistor-meter-fluke-like
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