// Output Device Test Code - OLED I2C Telemetry Screen
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET    -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

const int SENSOR_PIN = 2; // GPIO2 Potentiometer Input

void setup() {
  Wire.begin(4, 5); // Initialize I2C on SDA=GPIO4, SCL=GPIO5
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // I2C address 0x3C
    for(;;); // Freeze if screen not detected
  }
  display.clearDisplay();
  display.setTextColor(SSD1306_WHITE);
  analogReadResolution(12);
}

void drawDashboard(int throttleVal) {
  display.clearDisplay();
  
  // Title
  display.setTextSize(1);
  display.setCursor(0, 0);
  display.print("GOKART TELEMETRY");
  
  // Speed display (dummy math based on throttle)
  int speed = map(throttleVal, 0, 4095, 0, 45); // Max 45 km/h
  display.setTextSize(2);
  display.setCursor(0, 16);
  display.print(speed);
  display.setTextSize(1);
  display.print(" km/h");
  
  // Draw Throttle Bar Graph
  int barWidth = map(throttleVal, 0, 4095, 0, 120);
  display.drawRect(0, 40, 120, 8, SSD1306_WHITE); // Outer border
  display.fillRect(0, 40, barWidth, 8, SSD1306_WHITE); // Filled bar
  
  // Battery status indicator (dummy)
  display.setCursor(0, 52);
  display.print("BATTERY: 42.1V");
  
  display.display();
}

void loop() {
  int sensorRead = analogRead(SENSOR_PIN);
  drawDashboard(sensorRead);
  delay(100);
}