Oled Written is deleted

Projects General Guidance
1

My Oled show text like that deletd(look in the photo)
image

My code is:


#include <Adafruit_GFX.h>
#include <Adafruit_GrayOLED.h>
#include <Adafruit_SPITFT.h>
#include <Adafruit_SPITFT_Macros.h>
#include <gfxfont.h>

#include <Adafruit_SSD1306.h>
#include <splash.h>


/*
  Arduino Wireless Communication Tutorial
        Indoor unit  - Receiver

  by Dejan Nedelkovski, www.HowToMechatronics.com
 Libraries:
 DS3231 - http://www.rinkydinkelectronics.com/library.php?id=73
 U8G2 - https://github.com/olikraus/u8g2
*/
#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>
#include <dht.h>
#include <DS3231.h>

#include <U8g2lib.h>
#include <Wire.h>

#define dataPin 8 // DHT22 sensor
dht DHT; // Creats a DHT object
DS3231 rtc(SDA, SCL);
U8G2_SSD1306_128X64_NONAME_1_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);

RF24 radio(10, 9); // CE, CSN
const byte address[6] = "00001";

char text[6] = "";
int readDHT22, t, h;
String inTemp, inHum, outTemp, outHum;
String rtcTime, rtcDate;
int draw_state = 0;
unsigned long previousMillis = 0;
long interval = 3000;

#define Temperature_20Icon_width 27
#define Temperature_20Icon_height 47
static const unsigned char Temperature_20Icon_bits[] U8X8_PROGMEM = {
  0x00, 0x00, 0x00, 0x00, 0x00, 0x3f, 0x00, 0x00, 0x80, 0x7f, 0x00, 0x00,
  0xc0, 0xe1, 0x00, 0x00, 0xe0, 0xc0, 0x01, 0x00, 0x60, 0x80, 0xf9, 0x03,
  0x60, 0x80, 0x01, 0x00, 0x60, 0x80, 0x01, 0x00, 0x60, 0x80, 0x79, 0x00,
  0x60, 0x80, 0x01, 0x00, 0x60, 0x80, 0x01, 0x00, 0x60, 0x80, 0xf9, 0x03,
  0x60, 0x80, 0x01, 0x00, 0x60, 0x80, 0x01, 0x00, 0x60, 0x8c, 0x79, 0x00,
  0x60, 0x9e, 0x01, 0x00, 0x60, 0x9e, 0x01, 0x00, 0x60, 0x9e, 0xf9, 0x03,
  0x60, 0x9e, 0x01, 0x00, 0x60, 0x9e, 0x01, 0x00, 0x60, 0x9e, 0x79, 0x00,
  0x60, 0x9e, 0x01, 0x00, 0x60, 0x9e, 0x01, 0x00, 0x60, 0x9e, 0xf9, 0x03,
  0x60, 0x9e, 0x01, 0x00, 0x60, 0x9e, 0x01, 0x00, 0x60, 0x9e, 0x01, 0x00,
  0x70, 0x9e, 0x03, 0x00, 0x38, 0x1e, 0x07, 0x00, 0x18, 0x3e, 0x0e, 0x00,
  0x1c, 0x3f, 0x0c, 0x00, 0x0c, 0x7f, 0x18, 0x00, 0x8c, 0xff, 0x18, 0x00,
  0x8e, 0xff, 0x38, 0x00, 0xc6, 0xff, 0x31, 0x00, 0xc6, 0xff, 0x31, 0x00,
  0xc6, 0xff, 0x31, 0x00, 0x8e, 0xff, 0x38, 0x00, 0x8c, 0xff, 0x18, 0x00,
  0x0c, 0x7f, 0x1c, 0x00, 0x3c, 0x1c, 0x0e, 0x00, 0x78, 0x00, 0x06, 0x00,
  0xe0, 0x80, 0x07, 0x00, 0xe0, 0xff, 0x03, 0x00, 0x80, 0xff, 0x00, 0x00,
  0x00, 0x1c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};


#define Humidity_20Icon_width 27
#define Humidity_20Icon_height 47
static const unsigned char Humidity_20Icon_bits[] U8X8_PROGMEM = {
  0x00, 0x00, 0x00, 0x00, 0x00, 0x70, 0x00, 0x00, 0x00, 0x70, 0x00, 0x00,
  0x00, 0x70, 0x00, 0x00, 0x00, 0xf8, 0x00, 0x00, 0x00, 0xdc, 0x00, 0x00,
  0x00, 0xdc, 0x01, 0x00, 0x00, 0x8e, 0x01, 0x00, 0x00, 0x86, 0x03, 0x00,
  0x00, 0x06, 0x03, 0x00, 0x00, 0x03, 0x07, 0x00, 0x80, 0x03, 0x06, 0x00,
  0x80, 0x01, 0x0c, 0x00, 0xc0, 0x01, 0x1c, 0x00, 0xc0, 0x00, 0x18, 0x00,
  0xe0, 0x00, 0x38, 0x00, 0x60, 0x00, 0x30, 0x00, 0x70, 0x00, 0x70, 0x00,
  0x30, 0x00, 0xe0, 0x00, 0x38, 0x00, 0xc0, 0x00, 0x18, 0x00, 0xc0, 0x01,
  0x1c, 0x00, 0x80, 0x01, 0x0c, 0x00, 0x80, 0x03, 0x0e, 0x00, 0x80, 0x03,
  0x06, 0x00, 0x00, 0x03, 0x06, 0x00, 0x00, 0x03, 0x07, 0x00, 0x00, 0x07,
  0x03, 0x00, 0x00, 0x06, 0x03, 0x00, 0x00, 0x06, 0x03, 0x00, 0x00, 0x06,
  0x63, 0x00, 0x00, 0x06, 0x63, 0x00, 0x00, 0x06, 0x63, 0x00, 0x00, 0x06,
  0xe3, 0x00, 0x00, 0x06, 0xc7, 0x00, 0x00, 0x06, 0xc6, 0x01, 0x00, 0x07,
  0x86, 0x03, 0x00, 0x03, 0x0e, 0x1f, 0x00, 0x03, 0x0e, 0x1e, 0x80, 0x01,
  0x1c, 0x00, 0xc0, 0x01, 0x38, 0x00, 0xe0, 0x00, 0x78, 0x00, 0x70, 0x00,
  0xf0, 0x00, 0x38, 0x00, 0xe0, 0x07, 0x1f, 0x00, 0x80, 0xff, 0x0f, 0x00,
  0x00, 0xff, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00
};

void setup() {
  radio.begin();
  radio.openReadingPipe(0, address);
  radio.setPALevel(RF24_PA_MIN);
  radio.startListening();
  u8g2.begin();
  rtc.begin();

}
void loop() {
  if (radio.available()) {
    radio.read(&text, sizeof(text)); // Read incoming data
    outTemp = String(text[0]) + String(text[1]) + char(176) + "C"; // Outdoor Temperature
    outHum = String(text[2]) + String(text[3]) + "%"; // Outdoor Humidity
  }

  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis > interval) {
    previousMillis = currentMillis;
    u8g2.firstPage();
    do {
      switch (draw_state ) {
        case 0: drawDate(); break;
        case 1: drawInTemperature(); break;
        case 2: drawInHumidity(); break;
        case 3: drawOutTemperature(); break;
        case 4: drawOutHumidity(); break;
      }
    } while ( u8g2.nextPage() );
    draw_state++;
    if (draw_state > 4) {
      draw_state = 0;
    }
  }
}


void drawDate() {
  String dowa = rtc.getDOWStr();
  dowa.remove(3);
  rtcDate = dowa + " " + rtc.getDateStr();
  u8g2.setFont(u8g2_font_timB14_tr);
  u8g2.setCursor(0, 15);
  rtcTime = rtc.getTimeStr(); // DS3231 RTC time
  rtcTime.remove(5);
  u8g2.print(rtcDate);
  u8g2.setFont(u8g2_font_fub30_tf);
  u8g2.setCursor(8, 58);
  u8g2.print(rtcTime);
}

void drawInTemperature() {
  readDHT22 = DHT.read22(dataPin); // Reads the data from the sensor
  t = DHT.temperature; // Gets the values of the temperature
  inTemp = String(t) + char(176) + "C";
  u8g2.setFont(u8g2_font_helvR14_tr);
  u8g2.setCursor(24, 15);
  u8g2.print("INDOOR");
  u8g2.setFont(u8g2_font_fub30_tf);
  u8g2.setCursor(36, 58);
  u8g2.print(inTemp);
  u8g2.drawXBMP( 0, 17, Temperature_20Icon_width, Temperature_20Icon_height, Temperature_20Icon_bits);
}

void drawInHumidity() {
  h = DHT.humidity; // Gets the values of the humidity
  inHum = String(h) + "%";
  u8g2.setFont(u8g2_font_helvR14_tr);
  u8g2.setCursor(24, 15);
  u8g2.print("INDOOR");
  u8g2.setFont(u8g2_font_fub30_tf);
  u8g2.setCursor(36, 58);
  u8g2.print(inHum);
  u8g2.drawXBMP( 0, 17, Humidity_20Icon_width, Humidity_20Icon_height, Humidity_20Icon_bits);
}

void drawOutTemperature() {
  u8g2.setFont(u8g2_font_helvR14_tr);
  u8g2.setCursor(12, 15);
  u8g2.print("OUTDOOR");
  u8g2.setFont(u8g2_font_fub30_tf);
  u8g2.setCursor(36, 58);
  u8g2.print(outTemp);
  u8g2.drawXBMP( 0, 17, Temperature_20Icon_width, Temperature_20Icon_height, Temperature_20Icon_bits);
}
void drawOutHumidity() {
  u8g2.setFont(u8g2_font_helvR14_tr);
  u8g2.setCursor(12, 15);
  u8g2.print("OUTDOOR");
  u8g2.setFont(u8g2_font_fub30_tf);
  u8g2.setCursor(36, 58);
  u8g2.print(outHum);
  u8g2.drawXBMP( 0, 17, Humidity_20Icon_width, Humidity_20Icon_height, Humidity_20Icon_bits);
}

The project is from this website https://howtomechatronics.com/tutorials/arduino/arduino-wireless-weather-station-project/

What can I do in this state???

2

Write over the previous value on the screen with the background colour to erase it before writing another one to the screen or more clumsy, write spaces over the previous value before writing another one

3

When using u8g2 with a page buffer, the data being display must not be changed inside the firstPage/nextPage loop.

Not needed when using u8g2 with a page buffer, the old image on the display is completely overwritten.

Check the jumper wire connections going to the display, you might have a bad connection or jumper wire. Another possibility is the constructor for the display may be wrong - the code does not exhibit the problems here, but I do not have the radio module. Also possible that you are having a power problem, the radio modules do take a bit of current.

4

There is also no need for all the Adafruit libraries at the beginning of the code, you never use those and the code is compiling fine with the first eight lines commented out.

5

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