// STM32 Nucleo-C031C6 SPI LCD Example
// Simulation: https://wokwi.com/projects/365549388158011393

#include "SPI.h"
#include "Adafruit_GFX.h"
#include "Adafruit_ILI9341.h"
#include "stdlib.h"

// Pin definitions
int trigpin = 4;     // Trigger pin
int echopin = 5;     // Echo pin

#define TFT_DC 2
#define TFT_CS 3
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC);

int pingTraveltime;       // Echo travel time
float targetdistance;     // Measured distance
const float thresholdDistance = 50.0; // Threshold in cm

void setup() {

  pinMode(trigpin, OUTPUT);
  pinMode(echopin, INPUT);

  Serial.begin(115200);
  Serial.println("Hello, WOKWI");
  tft.begin();

  tft.setCursor(20, 120);
  tft.setTextColor(ILI9341_RED);
  tft.setTextSize(3);
  tft.println("Hello STM2");

  tft.setCursor(24, 160);
  tft.setTextColor(ILI9341_GREEN);
  tft.setTextSize(2);
  tft.println("I can do SPI :-)");
}
char ftext[30];
void loop() {
    // Trigger the ultrasonic pulse
  digitalWrite(trigpin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigpin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigpin, LOW);

  // Read echo time
  pingTraveltime = pulseIn(echopin, HIGH);

  // Convert time to distance
  targetdistance = (pingTraveltime * 0.0343) / 2;
  sprintf(ftext,"%d",(int)(targetdistance));
//  dtostrf(targetdistance, 4, 2, ftext);
  // Buzzer ON if object too close
  if (targetdistance > 0 && targetdistance <= thresholdDistance) {
    tft.fillScreen(ILI9341_BLACK);
    tft.setCursor(30, 260);
    tft.println("Hello Echo");
  } else {
    tft.fillScreen(ILI9341_BLACK);
    tft.setCursor(30, 260);
    tft.println("------------");
  }
    tft.println(ftext);
      Serial.println(ftext);
  delay(200);  // stable plotting
 }