Deliverables¶

#include <SPI.h>  // Include the SPI library for communication with AD9833

// Define SPI pins for AD9833 (adjust these based on your Arduino model)
const int resetPin = 8;   // Reset pin for AD9833
const int FSYNCpin = 10;   // Frequency sync pin for AD9833

// Frequency settings (adjust based on your project needs)
float frequency = 10.0;    // Frequency in Hz (adjust to 1-30Hz for relaxation)
float amplitude = 1000;    // Adjust based on your circuit and tissue needs

// AD9833 commands
#define CMD_SET_FREQUENCY 0x2100  // Command to set frequency
#define CMD_SET_PHASE 0x2200      // Command to set phase
#define CMD_SET_CONTROL 0x2000    // Command to set control settings

void setup() {
  // Start the serial communication for debugging
  Serial.begin(9600);

  // Initialize SPI communication
  SPI.begin();

  // Set up AD9833 pins
  pinMode(resetPin, OUTPUT);
  pinMode(FSYNCpin, OUTPUT);

  // Reset the AD9833 (activate reset)
  digitalWrite(resetPin, LOW);
  delay(10);
  digitalWrite(resetPin, HIGH);
  delay(10);

  // Set up AD9833 for sine wave output
  setFrequency(frequency);
  setPhase(0);  // Initial phase set to 0
}

void loop() {
  // Continuously output PEMF signal (you can add additional logic to control frequency dynamically)
  // Adjust frequency dynamically if needed (e.g., based on external input or a sensor)

  // For now, this will keep outputting the frequency at the defined setting
  // Adjust this part based on how you want the signal to change over time
  delay(1000);
}

void setFrequency(float freq) {
  // Convert frequency to the 32-bit format used by AD9833
  uint32_t freqWord = (freq * pow(2, 28)) / 25000000;  // 25MHz is the clock for AD9833

  // Send frequency data to AD9833
  SPI.transfer(CMD_SET_FREQUENCY);  // Select frequency register
  SPI.transfer(freqWord & 0xFF);    // Send lower byte
  SPI.transfer((freqWord >> 8) & 0xFF); // Send middle byte
  SPI.transfer((freqWord >> 16) & 0xFF); // Send upper byte
  digitalWrite(FSYNCpin, LOW); // Sync the data
  digitalWrite(FSYNCpin, HIGH);

  Serial.print("Set Frequency to: ");
  Serial.println(freq);
}
void setPhase(int phase) {
  // Send phase data to AD9833
  SPI.transfer(CMD_SET_PHASE); // Select phase register
  SPI.transfer(phase & 0xFF);  // Send phase value
  digitalWrite(FSYNCpin, LOW); // Sync the data
  digitalWrite(FSYNCpin, HIGH);

  Serial.print("Set Phase to: ");
  Serial.println(phase);
}