Adafruit 0.96 display won't work with my code

helio_phoebus · January 18, 2024, 5:03pm

I am using Arduino UNO R3,
pin connections to the display are:
Vcc - 5V
Ground - Ground
SDA - A4
SCL - A5

It doesn't work with this code:

#include <dht.h>
#include <PMsensor.h>
#include <RTClib.h>
#include <SD.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 32
#define SCREEN_ADDRESS 0x3C
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

int CS = 10;
File file;

RTC_DS1307 rtc;
char daysOfTheWeek[7][12] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};

dht DHT;
#define dht_apin A1 // Analog Pin sensor is connected to

PMsensor PM;

void setup() {
  Serial.begin(9600);
  Serial.println("NOTUS");

  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(CS, OUTPUT); // chip select pin is set as OUTPUT
  PM.init(9, A0);

  #ifndef ESP8266
  while (!Serial); // wait for serial port to connect. Needed for native USB
  #endif

  if (!rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    while (1) delay(10);
  }

  if (!SD.begin(CS)) {
    Serial.println("Could not initialize SD card.");
  }

  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;);
  }

  delay(100);
  display.clearDisplay();
}


void loop(){
  //Start of Program 
  DHT.read11(dht_apin); 
  Serialwrite();
  Filewrite();
  Displaywrite();
}

void Serialwrite()
{
  float filter_Data = PM.read(0.1);

  Serial.print("Humidity:");
  Serial.print(DHT.humidity);
  Serial.print(",");
  Serial.print("Temperature:");
  Serial.print(DHT.temperature); 
  Serial.print(",");
  Serial.print("PM 2.5:");
  Serial.println(filter_Data);
} 

void Filewrite()
{
  DateTime now = rtc.now();
  float filter_Data = PM.read(0.1);

  file = SD.open("notus.txt", FILE_WRITE);

  if (file) {
  file.print("| ");
  file.print(now.year(), DEC);
  file.print('/');
  file.print(now.month(), DEC);
  file.print('/');
  file.print(now.day(), DEC);
  file.print(" (");
  file.print(daysOfTheWeek[now.dayOfTheWeek()]);
  file.print(") ");
  file.print(now.hour(), DEC);
  file.print(':');
  file.print(now.minute(), DEC);
  file.print(':');
  file.print(now.second(), DEC);

  file.print(" | Current humidity = ");
  file.print(DHT.humidity);
  file.print("%");
  file.print(" Temperature = ");
  file.print(DHT.temperature); 
  file.print("°C ");

  file.print("| PM 2.5 : ");
  file.print(filter_Data);
  file.println("µg/m³ |");

  file.close();

  delay(800);
  }

  else {
  Serial.println("Could not open file");
  }
}

void Displaywrite()
{
  display.clearDisplay();

  display.setTextSize(1.5);
  display.setTextColor(SSD1306_WHITE);

  display.setCursor(0, 0);
  display.print("Humidity: ");
  display.print(DHT.humidity);

  display.setCursor(0, 10);
  display.print("Temperature: ");
  display.print(DHT.temperature);

  display.setCursor(0, 20);
  display.print("PM 2.5: ");
  display.print(PM.read(0.1));

  display.display();
}

But it does work with:

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

void setup() {
  Serial.begin(9600);

  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;);
  }

  delay(2000);  // Pause for 2 seconds
  display.clearDisplay();
}

void loop() {
  display.clearDisplay();

  display.setTextSize(1.5);
  display.setTextColor(SSD1306_WHITE);

  display.setCursor(0, 0);
  display.print("Humidity: ");


  display.setCursor(0, 10);
  display.print("Temperature: ");

  display.setCursor(0, 20);
  display.print("PM 2.5: ");


  display.display();
}

What am I doing wrong?
Please help

helio_phoebus · January 18, 2024, 5:05pm

Also, I receive 'SSD1306 allocation failed' on the serial monitor from my fail safe:

if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;);

van_der_decken · January 18, 2024, 5:24pm

This topic is a duplicate of Adafruit 0.96 display won't work with my code. Cross posting is not permitted in the forum, and has been reported.

helio_phoebus · January 18, 2024, 5:25pm

It was an accident, how do i delete one of them?
I'm new to the forum

helio_phoebus · January 18, 2024, 10:40am

#include <dht.h>
#include <PMsensor.h>
#include <RTClib.h>
#include <SD.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

int CS = 10;
File file;

RTC_DS1307 rtc;
char daysOfTheWeek[7][12] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};

dht DHT;
#define dht_apin A1 // Analog Pin sensor is connected to

PMsensor PM;

#define screen_width 128
#define screen_height 64

Adafruit_SSD1306 display(screen_width, screen_height);

void setup(){
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(CS, OUTPUT); // chip select pin is set as OUTPUT

  delay(500);//Delay to let system boot
  Serial.println("NOTUS");

  Serial.begin(9600);
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  PM.init(9, A0);
  
  #ifndef ESP8266
  while (!Serial); // wait for serial port to connect. Needed for native USB
  #endif

  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    while (1) delay(10);
  }

  if (! rtc.isrunning()) {
    Serial.println("RTC is NOT running, let's set the time!");
  }

  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    while (1) delay(10);
  }

  if (!SD.begin(CS)) { // Initialize SD card
    Serial.println("Could not initialize SD card."); // if return value is false, something went wrong.
  }
}

void loop(){
  // Start of Program 
  delay(200); // Update and writing interval basically.
  DHT.read11(dht_apin); 
  Serialwrite();
  Filewrite();
  displaywrite();
}

void displaywrite()
{
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);

  display.setCursor(0, 0);
  display.print("Humidity: ");
  display.print(DHT.humidity);
  display.print("%");

  display.setCursor(0, 10);
  display.print("Temperature: ");
  display.print(DHT.temperature);
  display.print("C");

  display.setCursor(0, 20);
  display.print("PM 2.5: ");
  display.print(PM.read(0.1));
  display.print("ug/m^3");

  display.display();
}

void Serialwrite()
{
  float filter_Data = PM.read(0.1);

  Serial.print("Humidity:");
  Serial.print(DHT.humidity);
  Serial.print(",");
  Serial.print("Temperature:");
  Serial.print(DHT.temperature); 
  Serial.print(",");
  Serial.print("PM 2.5:");
  Serial.println(filter_Data);
} 

void Filewrite()
{
  DateTime now = rtc.now();
  float filter_Data = PM.read(0.1);

  file = SD.open("notus.txt", FILE_WRITE);

  if (file) {
    file.print("| ");
    file.print(now.year(), DEC);
    file.print('/');
    file.print(now.month(), DEC);
    file.print('/');
    file.print(now.day(), DEC);
    file.print(" (");
    file.print(daysOfTheWeek[now.dayOfTheWeek()]);
    file.print(") ");
    file.print(now.hour(), DEC);
    file.print(':');
    file.print(now.minute(), DEC);
    file.print(':');
    file.print(now.second(), DEC);

    file.print(" | Current humidity = ");
    file.print(DHT.humidity);
    file.print("%");
    file.print(" Temperature = ");
    file.print(DHT.temperature); 
    file.print("°C ");

    file.print("| PM 2.5 : ");
    file.print(filter_Data);
    file.println("µg/m³ |");

    file.close();

    delay(800);
  } else {
    Serial.println("Could not open file");
  }
}

Please help

UKHeliBob · January 18, 2024, 10:43am

Which Arduino board are you using and how is the display connected to it ?

helio_phoebus · January 18, 2024, 4:22pm

Sorry for late reply

It's Arduino Uno R3, the pins are as follows
Vcc - 5v
Gnd - Gnd
SDA - A4
SCL - A5

It gives me error 'SSD1306 allocation failed'

helio_phoebus · January 18, 2024, 4:31pm

I dont know if this helps but,
the display works with this code

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

void setup() {
  Serial.begin(9600);

  if (!display.begin(SSD1306_ADDRESS, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;);
  }

  delay(2000);  // Pause for 2 seconds
  display.clearDisplay();
}

void loop() {
  display.clearDisplay();

  // Generate two random variables
  int randomVar1 = random(0, 100);
  int randomVar2 = random(0, 100);

  // Display the random variables on the OLED
  display.setTextSize(2);
  display.setTextColor(SSD1306_WHITE);

  display.setCursor(10, 10);
  display.print("Var1: ");
  display.print(randomVar1);

  display.setCursor(10, 40);
  display.print("Var2: ");
  display.print(randomVar2);

  display.display();

  delay(2000);  // Pause for 2 seconds before updating display
}

but not this code

#include <dht.h>
#include <PMsensor.h>
#include <RTClib.h>
#include <SD.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 32
#define SCREEN_ADDRESS 0x3C
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

int CS = 10;
File file;

RTC_DS1307 rtc;
char daysOfTheWeek[7][12] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};

dht DHT;
#define dht_apin A1 // Analog Pin sensor is connected to

PMsensor PM;

void setup() {
  Serial.begin(9600);
  Serial.println("NOTUS");

  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(CS, OUTPUT); // chip select pin is set as OUTPUT
  PM.init(9, A0);

  #ifndef ESP8266
  while (!Serial); // wait for serial port to connect. Needed for native USB
  #endif

  if (!rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    while (1) delay(10);
  }

  if (!SD.begin(CS)) {
    Serial.println("Could not initialize SD card.");
  }

  if (!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;);
  }

  delay(100);
  display.clearDisplay();

  Serial.println("Display initialization successful");
}


void loop(){
  //Start of Program 
  DHT.read11(dht_apin); 
  Serialwrite();
  Filewrite();
  Displaywrite();
}

void Serialwrite()
{
  float filter_Data = PM.read(0.1);

  Serial.print("Humidity:");
  Serial.print(DHT.humidity);
  Serial.print(",");
  Serial.print("Temperature:");
  Serial.print(DHT.temperature); 
  Serial.print(",");
  Serial.print("PM 2.5:");
  Serial.println(filter_Data);
} 

void Filewrite()
{
  DateTime now = rtc.now();
  float filter_Data = PM.read(0.1);

  file = SD.open("notus.txt", FILE_WRITE);

  if (file) {
  file.print("| ");
  file.print(now.year(), DEC);
  file.print('/');
  file.print(now.month(), DEC);
  file.print('/');
  file.print(now.day(), DEC);
  file.print(" (");
  file.print(daysOfTheWeek[now.dayOfTheWeek()]);
  file.print(") ");
  file.print(now.hour(), DEC);
  file.print(':');
  file.print(now.minute(), DEC);
  file.print(':');
  file.print(now.second(), DEC);

  file.print(" | Current humidity = ");
  file.print(DHT.humidity);
  file.print("%");
  file.print(" Temperature = ");
  file.print(DHT.temperature); 
  file.print("°C ");

  file.print("| PM 2.5 : ");
  file.print(filter_Data);
  file.println("µg/m³ |");

  file.close();

  delay(800);
  }

  else {
  Serial.println("Could not open file");
  }
}

void Displaywrite()
{
  display.clearDisplay();

  display.setTextSize(2);
  display.setTextColor(SSD1306_WHITE);

  display.setCursor(0, 0);
  display.print("Humidity: ");
  display.print(DHT.humidity);

  display.setCursor(0, 10);
  display.print("Temperature: ");
  display.print(DHT.temperature);

  display.setCursor(0, 20);
  display.print("PM 2.5: ");
  display.print(PM.read(0.1));

  display.display();
}

I'm in a hurry, please help

david_2018 · January 18, 2024, 5:25pm

The display library needs 1024 bytes of free ram for use as a buffer.

van_der_decken · January 18, 2024, 5:26pm

From How to get the best out of this forum

Don't bump!

Don't bump your topic after an hour. Because of the different time zones, the person who knows the answer may be asleep, or away for the day or maybe on holiday. Maybe after a couple of days, but even then think about whether you have provided enough information and asked a question that can be answered. You could even ask us 'what else can I provide in order to get some help?'.

helio_phoebus · January 18, 2024, 5:28pm

What do I do now?
Is there any other library that I can use that doesn't require buffer?

Coding_Badly · January 18, 2024, 5:30pm

Threads merged.

helio_phoebus · January 18, 2024, 5:30pm

Thank you

van_der_decken · January 18, 2024, 5:35pm

Had you used the forum search to look for SSD1306 allocation failed 7 hours ago, you might have discovered the answer for yourself back then, tried switching to a text only SSD1306 library and had things working already.

helio_phoebus · January 18, 2024, 5:51pm

I'm new, can you just be a bit more nice?

van_der_decken · January 18, 2024, 5:53pm

Pointing out how you could have saved yourself hours of waiting by displaying a little initiative and taking advantage of the available resources is inappropriate? Giving you the answer you were looking for is inappropriate? Very well then. Good luck and good bye.

helio_phoebus · January 18, 2024, 5:58pm

Sorry, man it's been a rough day
I apologize

helio_phoebus · January 18, 2024, 5:58pm

Thank you for a reply it saved a ton of efforts

system · July 16, 2024, 5:58pm

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.

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Adafruit 0.96 display won't work with my code

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