How can I generate multiple frequencies?

Other Hardware General Electronics
1

What IC can I use to generate multiple variable different frequencies? The IC should output that frequency to different pins, that aren’t dependent on each other.
for example: In one moment, I want 140 kHz on pin 1, 270 kHz on pin 2, 400 kHz on pin 3.

2

An Arduino can do that, using the timers.

3

but the square wave is not perfect I want to fid the signals into LEDs and the timer can't generate specific frequencies.

4

Complete nonsense.

If you want help, describe your project in sufficient detail. See the "How to get the best out of the forum" post.

1 Like
5

I want to generate three electrical ID signals with different carrier frequencies for 3 LEDs (The carrier frequencies are 140 kHz, 270 kHz, and 400 kHz); Each LED transmits an identity ID signal in the format on-off keying upconverted to a specific RF carrier frequency.
how can I do that?

6

An Arduino can generate the three mentioned frequencies, by programming the timers correctly. Excellent tutorial for AVR based Arduinos at: https://www.gammon.com.au/timers

3 Likes
7

You could use an Si5351 clock generator.

https://learn.adafruit.com/adafruit-si5351-clock-generator-breakout
image

1 Like
8

when I tried to simulate si5351 with Arduino in proteus I didn't get any output.
I used the code below:

#include <Adafruit_SI5351.h>
#include <Wire.h>
Adafruit_SI5351 clockgen = Adafruit_SI5351();

/**************************************************************************/
/*
    Arduino setup function (automatically called at startup)
*/
/**************************************************************************/
void setup(void)
{
  Serial.begin(9600);
  Serial.println("Si5351 Clockgen Test"); Serial.println("");

  /* Initialise the sensor */
  if (clockgen.begin() != ERROR_NONE)
  {
    /* There was a problem detecting the IC ... check your connections */
    Serial.print("Ooops, no Si5351 detected ... Check your wiring or I2C ADDR!");
    while(1);
  }

  Serial.println("OK!");

  /* INTEGER ONLY MODE --> most accurate output */
  /* Setup PLLA to integer only mode @ 900MHz (must be 600..900MHz) */
  /* Set Multisynth 0 to 112.5MHz using integer only mode (div by 4/6/8) */
  /* 25MHz * 36 = 900 MHz, then 900 MHz / 8 = 112.5 MHz */
  Serial.println("Set PLLA to 900MHz");
  clockgen.setupPLLInt(SI5351_PLL_A, 36);
  Serial.println("Set Output #0 to 112.5MHz");
  clockgen.setupMultisynthInt(0, SI5351_PLL_A, SI5351_MULTISYNTH_DIV_8);

  /* FRACTIONAL MODE --> More flexible but introduce clock jitter */
  /* Setup PLLB to fractional mode @616.66667MHz (XTAL * 24 + 2/3) */
  /* Setup Multisynth 1 to 13.55311MHz (PLLB/45.5) */
  clockgen.setupPLL(SI5351_PLL_B, 24, 2, 3);
  Serial.println("Set Output #1 to 13.553115MHz");
  clockgen.setupMultisynth(1, SI5351_PLL_B, 45, 1, 2);

  /* Multisynth 2 is not yet used and won't be enabled, but can be */
  /* Use PLLB @ 616.66667MHz, then divide by 900 -> 685.185 KHz */
  /* then divide by 64 for 10.706 KHz */
  /* configured using either PLL in either integer or fractional mode */

  Serial.println("Set Output #2 to 10.706 KHz");
  clockgen.setupMultisynth(2, SI5351_PLL_B, 900, 0, 1);
  clockgen.setupRdiv(2, SI5351_R_DIV_64);

  /* Enable the clocks */
  clockgen.enableOutputs(true);
}

/**************************************************************************/
/*
    Arduino loop function, called once 'setup' is complete (your own code
    should go here)
*/
/**************************************************************************/
void loop(void)
{
}```
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![si5351|690x390](upload://hHlivA95ybc6ngu6L1ORJ6Szofx.png)
9

Does Proteus actually claim to include the SI5351? :worried:

10

yes, It does.
I bought a si5351 and I still getting the same error

11

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