device.ino

#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <RF24.h>
#include <nRF24L01.h>
#include "printf.h"

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Declaration for SSD1306 display connected using software SPI (default case):
#define OLED_MOSI   9
#define OLED_CLK   10
#define OLED_DC    5
#define OLED_CS    6
#define OLED_RESET 4

#define BT1 2
#define BT2 3

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT,
  OLED_MOSI, OLED_CLK, OLED_DC, OLED_RESET, OLED_CS);

RF24 radio(7, 8);
const uint8_t num_channels = 64;
int values[num_channels];
int valuesDisplay[32];
int channel = 0;
const byte address[6] = "00001";
const int num_reps = 50;
bool jamming = true;

void setup() {
  Serial.begin(115200);
  pinMode(BT1, INPUT_PULLUP);
  pinMode(BT2, INPUT_PULLUP);

  attachInterrupt(digitalPinToInterrupt(BT1), pressBt01, FALLING);
  attachInterrupt(digitalPinToInterrupt(BT2), pressBt02, FALLING);

  radio.begin();
  radio.startListening();
  radio.stopListening();
  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if (!display.begin(SSD1306_SWITCHCAPVCC)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;); // Don't proceed, loop forever
  }
}

void loop() {

  renderGraph();

  if (jamming) {
    display.clearDisplay();
    display.setTextSize(1);
    display.setTextColor(WHITE);
    display.setCursor(10, 10);
    display.println(("JAMMING CHANNEL" + String(channel + 1)));
    radio.setPALevel(RF24_PA_HIGH);
    radio.setDataRate(RF24_2MBPS);
    display.display();
  }
  while (jamming) {
    jammer();
  }

}

void jammer() {
  const char text[] = "xxxxxxxxxxxxxxxx"; // send the noise
  for (int i = ((channel * 5) + 1); i < ((channel * 5) + 23); i++) {
    radio.setChannel(i);
    radio.write( & text, sizeof(text));
  }

}

void renderGraph() {
  memset(values, 0, sizeof(values));

  // Scan all channels num_reps times
  int rep_counter = num_reps;
  while (rep_counter--) {
    int i = num_channels;
    while (i--) {
      // Select this channel
      radio.setChannel(i * 2);
      // Listen for a little
      radio.startListening();
      delayMicroseconds(50);
      radio.stopListening();

      // Did we get a carrier?
      if (radio.testCarrier())
        ++values[i];
    }
  }
  // Clear the buffer
  display.clearDisplay();
  display.drawLine(0, 50, 127, 50, WHITE);

  // Adjusting the bars to correct resolution of the display
  for (int i = 0; i < 64; i++) {
    display.fillRect((1 + (i * 2)), (50 - values[i]), 2, values[i], WHITE);
  }

  // Drawing the bottom lines
  display.drawLine(0, 55, 0, 60, WHITE);
  display.drawLine(15, 55, 15, 60, WHITE);
  display.drawLine(31, 55, 31, 60, WHITE);
  display.drawLine(47, 55, 47, 60, WHITE);
  display.drawLine(63, 55, 63, 60, WHITE);
  display.drawLine(80, 55, 80, 60, WHITE);
  display.drawLine(95, 55, 95, 60, WHITE);
  display.drawLine(111, 55, 111, 60, WHITE);
  display.drawLine(127, 55, 127, 60, WHITE);

  // Show selected channel to start jam
  display.setTextSize(1); // Normal 1:1 pixel scale
  display.setTextColor(WHITE); // Draw white text
  display.setCursor(10, 10); // Start at top-left corner
  display.print("channel: " + String(channel + 1));
  display.display();
}

void pressBt01() {
  static unsigned long last_interrupt_time = 0;
  unsigned long interrupt_time = millis();
  if (interrupt_time - last_interrupt_time > 200) {
    if (channel < 13) {
      channel++;
    } else {
      channel = 0;
    }
  }
  last_interrupt_time = interrupt_time;
}

void pressBt02() {
  jamming = !jamming;
  delay(200);
}