Mirko Pavleski
Published © GPL3+

DIY Simple Frequency Meter Up to 6.5MHz

Another simple to build useful instrument in you lab.

BeginnerFull instructions provided1,496
DIY Simple Frequency Meter Up to 6.5MHz

Things used in this project

Hardware components

Arduino Nano R3
Arduino Nano R3
×1
Standard LCD - 16x2 White on Blue
Adafruit Standard LCD - 16x2 White on Blue
×1
General Purpose Transistor NPN
General Purpose Transistor NPN
×1
Slide Switch
Slide Switch
×1
Tactile Switch, Top Actuated
Tactile Switch, Top Actuated
×1
Resistors, capacitors, diodes
×1

Software apps and online services

Arduino IDE
Arduino IDE

Hand tools and fabrication machines

Soldering iron (generic)
Soldering iron (generic)

Story

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Schematics

Schematic

Code

Code

C/C++
#include <FreqCount.h>//https://github.com/PaulStoffregen/FreqCount/archive/master.zip
#include <LiquidCrystal.h>

LiquidCrystal lcd(12, 11, 6, 4, 3, 2);// RS,E,D4,D5,D6,D7
void setup() {
  lcd.begin(16, 2);// LCD 16X2
  pinMode(7,INPUT);
  FreqCount.begin(1000);
}
unsigned long f;float f0;
int x,n=3,r;

void loop() {
  
  if(digitalRead(7)==HIGH){n++;x=0;delay(100);}
    lcd.setCursor(0,1);
  if(n==1){x++;if(x==1){FreqCount.begin(100);}r=-1;lcd.print("T = 0.1 s ");}
  if(n==2){x++;if(x==1){FreqCount.begin(10000);}r=1;lcd.print("T = 10 s ");}
  if(n==3){x++;if(x==1){FreqCount.begin(1000);}r=0;lcd.print("T = 1 s  ");}
  if(n>3){n=1;} 
    lcd.setCursor(0,0);
    lcd.print("F = ");
  if(f>=1000000 && n==3){f0=f/1000000.0;lcd.print(f0,6+r);lcd.print(" MHz");}
  if(f<1000000 && n==3){f0=f/1000.0;lcd.print(f0,3+r);lcd.print(" kHz");}
  if(f>=100000 && n==1){f0=f/100000.0;lcd.print(f0,6+r);lcd.print(" MHz");}
  if(f<100000 && n==1){f0=f/100.0;lcd.print(f0,3+r);lcd.print(" kHz");}
  if(f>=10000000 && n==2){f0=f/10000000.0;lcd.print(f0,6+r);lcd.print("MHz");}
  if(f<10000000 && n==2){f0=f/10000.0;lcd.print(f0,3+r);lcd.print(" kHz");}

  if (FreqCount.available()) { 
   
    f = FreqCount.read(); 
    
   lcd.setCursor(10,1);lcd.print("***");
  }
   delay(200);
   lcd.clear();
}

FreqCount-master

C/C++
No preview (download only).

Credits

Mirko Pavleski

Mirko Pavleski

8 projects • 304 followers

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