Hello everybody, im an enthusiast of Arduino for years, this is my first time to seek advice in one of my ongoing project, im building a distance range scanner using HC-SR 04 Ultrasonic Sensor, TFT 2.4 Screen and Arduino UNO.
The issue: when the sensor scans a distance range more than 10 cm i.e. 25, 50, 80 and when I scan back closer in a range of 1 cm to 9 cm, the second digit figure doesn’t disappears (see photo) remains the screen, I would highly appreciate someone can help me, thanks
NOTE: below code for guidance.
// IMPORTANT: Adafruit_TFTLCD LIBRARY MUST BE SPECIFICALLY
// CONFIGURED FOR EITHER THE TFT SHIELD OR THE BREAKOUT BOARD.
// SEE RELEVANT COMMENTS IN Adafruit_TFTLCD.h FOR SETUP.
////Technical support:goodtft@163.com
#include <Wire.h>
#include <NewPing.h>
#include <Adafruit_GFX.h> // Core graphics library
#include <Adafruit_TFTLCD.h> // Hardware-specific library
// *************************************
#define TRIGGER_PIN 12
#define ECHO_PIN 11
#define MAX_DISTANCE 200
NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE);
// ***************************************
// The control pins for the LCD can be assigned to any digital or
// analog pins...but we'll use the analog pins as this allows us to
// double up the pins with the touch screen (see the TFT paint example).
#define LCD_CS A3 // Chip Select goes to Analog 3
#define LCD_CD A2 // Command/Data goes to Analog 2
#define LCD_WR A1 // LCD Write goes to Analog 1
#define LCD_RD A0 // LCD Read goes to Analog 0
#define LCD_RESET A4 // Can alternately just connect to Arduino's reset pin
// When using the BREAKOUT BOARD only, use these 8 data lines to the LCD:
// For the Arduino Uno, Duemilanove, Diecimila, etc.:
// D0 connects to digital pin 8 (Notice these are
// D1 connects to digital pin 9 NOT in order!)
// D2 connects to digital pin 2
// D3 connects to digital pin 3
// D4 connects to digital pin 4
// D5 connects to digital pin 5
// D6 connects to digital pin 6
// D7 connects to digital pin 7
// For the Arduino Mega, use digital pins 22 through 29
// (on the 2-row header at the end of the board).
// Assign human-readable names to some common 16-bit color values:
#define BLACK 0x0000
#define BLUE 0x001F
#define RED 0xF800
#define GREEN 0x07E0
#define CYAN 0x07FF
#define MAGENTA 0xF81F
#define YELLOW 0xFFE0
#define WHITE 0xFFFF
Adafruit_TFTLCD tft(LCD_CS, LCD_CD, LCD_WR, LCD_RD, LCD_RESET);
// If using the shield, all control and data lines are fixed, and
// a simpler declaration can optionally be used:
// Adafruit_TFTLCD tft;
Adafruit_GFX_Button buttons[15];
//**************************
const int analogInPin = A5; // Analog input pin that the potentiometer is attached to
const int analogOutPin = 9; // Analog output pin that the LED is attached to
int sensorValue = 0; // value read from the pot
int outputValue = 0; // value output to the PWM (analog out)
// ******************************************************
void setup(void) {
Serial.begin(115200);
Serial.println(F("TFT LCD test"));
#ifdef USE_ADAFRUIT_SHIELD_PINOUT
Serial.println(F("Using Adafruit 2.4" TFT Arduino Shield Pinout"));
#else
Serial.println(F("Using Adafruit 2.4" TFT Breakout Board Pinout"));
#endif
Serial.print("TFT size is "); Serial.print(tft.width()); Serial.print("x"); Serial.println(tft.height());
tft.reset();
uint16_t identifier = tft.readID();
if(identifier==0x0101)
identifier=0x9341;
if(identifier == 0x9325) {
Serial.println(F("Found ILI9325 LCD driver"));
} else if(identifier == 0x4535) {
Serial.println(F("Found LGDP4535 LCD driver"));
}else if(identifier == 0x9328) {
Serial.println(F("Found ILI9328 LCD driver"));
} else if(identifier == 0x7575) {
Serial.println(F("Found HX8347G LCD driver"));
} else if(identifier == 0x9341) {
Serial.println(F("Found ILI9341 LCD driver"));
} else if(identifier == 0x8357) {
Serial.println(F("Found HX8357D LCD driver"));
} else {
Serial.print(F("Unknown LCD driver chip: "));
Serial.println(identifier, HEX);
Serial.println(F("If using the Adafruit 2.4" TFT Arduino shield, the line:"));
Serial.println(F(" #define USE_ADAFRUIT_SHIELD_PINOUT"));
Serial.println(F("should appear in the library header (Adafruit_TFT.h)."));
Serial.println(F("If using the breakout board, it should NOT be #defined!"));
Serial.println(F("Also if using the breakout, double-check that all wiring"));
Serial.println(F("matches the tutorial."));
return;
}
tft.begin(identifier);
tft.setRotation(3);
tft.fillScreen(BLACK);
tft.fillRect(15, 10, 290, 35, YELLOW);
tft.setTextColor(BLACK); tft.setTextSize(2);
tft.setCursor(33,20);
tft.println("RANGE FINDER");
tft.println("\r");
tft.setTextColor(WHITE); tft.setTextSize(2);
tft.setCursor(22,120);
tft.println("Distance:");
tft.println("\r");
tft.setTextColor(WHITE); tft.setTextSize(2);
tft.setCursor(223,120);
tft.println("cm");
tft.println("\r");
}
void loop(void) {
unsigned long start = micros();
tft.setCursor(0, 0);
tft.setTextColor(WHITE, BLACK); tft.setTextSize(5);
tft.setCursor(130,110);
tft.println(sonar.ping_cm());
tft.reset();
delay(10);
}
