70. High-Frequency Measurement

Design a system for measuring the frequency of square wave signals above 100 kHz using an Arduino UNO. Achieve maximum range for measuring frequency.

Note: You can use any approach or method which can generate frequencies between 100 kHz to 8 MHz (e.g., Function Generator, etc)

For example:

Generating frequency > 100 kHz using Arduino UNO

We have used another Arduino UNO along with a potentiometer to generate frequencies between 100 kHz and 8 MHz where a potentiometer is used to vary the frequency.

The corresponding code for generating these frequencies is provided below.

CODE

#define pot A0

void setup() {
  cli(); 
  TCCR1A = (1 << COM1A0);                // Toggle OC1A on compare match
  TCCR1B = (1 << WGM12) | (1 << CS10);   // CTC mode, prescaler = 1
  OCR1A = 0;                            
  // Corrected DDRB Configuration
  DDRB |= (1 << PB1);       //D9 (PB1) as outputs
  sei(); // Enable interrupts
}

void loop()
{
   uint16_t potValue = analogRead(pot);

   //map pot value to genetate frequency >100KHz 
   OCR1A = map(potValue, 0, 1024, 0, 80);
  
}

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