DIY Multimeter

Making your own lab equipment is fun!

Aug 15, 2018

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12619 views

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2 respects

Components and supplies

Arduino UNO

Resistor 10k ohm

Resistor 1M ohm

Apps and platforms

Arduino IDE

Project description

Code

CODE

csharp

1#include <LiquidCrystal_I2C.h>
2
3#include <Wire.h>
4LiquidCrystal_I2C  lcd(0x27,16,2);
5int input=A0;
6float r1=3702000.00;
7float r2=18000.00;
8void  setup()
9{
10  Serial.begin(115200);
11  lcd.begin();
12  lcd.backlight();
13  
14}
15void loop()
16{
17  int nomap=analogRead(input);
18  float temp=(nomap*4.99)/1023;
19  float volt=temp*(r1/(r1+r2));
20  if(volt<0.1){
21    volt=0.00;
22  }
23  lcd.setCursor(0,0);
24  lcd.print("voltage");
25  lcd.setCursor(0,1);
26  lcd.print(volt);
27  Serial.println(volt);
28  delay(100);
29}
30
31
32

#include <LiquidCrystal_I2C.h>

#include <Wire.h>
LiquidCrystal_I2C  lcd(0x27,16,2);
int input=A0;
float r1=3702000.00;
float r2=18000.00;
void  setup()
{
  Serial.begin(115200);
  lcd.begin();
  lcd.backlight();
  
}
void loop()
{
  int nomap=analogRead(input);
  float temp=(nomap*4.99)/1023;
  float volt=temp*(r1/(r1+r2));
  if(volt<0.1){
    volt=0.00;
  }
  lcd.setCursor(0,0);
  lcd.print("voltage");
  lcd.setCursor(0,1);
  lcd.print(volt);
  Serial.println(volt);
  delay(100);
}

Downloadable files

SCHEMATIC

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