Hi everybody,
I have a strange behaviour of small SSD1306 OLED 128x64 displays using them on different processors with exactly the same code.
I am using a simple example code to test a bme680 sensor with output on an OLED. I load the code on a ESP32C mini processor and everything OK. I can even switch between 128x64 and 128x32 resolution. If I load the same code on a NANO or UNO the 128x64 mode does not work, means the display doesn´t get allocated. If I change to 128x32 it gets work fine.
here is the code:
#include <Wire.h>
#include <Adafruit_Sensor.h>
#include "Adafruit_BME680.h"
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define BME_SCK 13
#define BME_MISO 12
#define BME_MOSI 11
#define BME_CS 10
#define SEALEVELPRESSURE_HPA (1013.25)
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
Adafruit_BME680 bme; // I2C
//Adafruit_BME680 bme(BME_CS); // hardware SPI
//Adafruit_BME680 bme(BME_CS, BME_MOSI, BME_MISO, BME_SCK);
//Adafruit_SSD1306 display = Adafruit_SSD1306();
Adafruit_SSD1306 display = Adafruit_SSD1306(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
void setup() {
//Serial.begin(9600);
//Serial.println(F("BME680 test"));
// by default, we'll generate the high voltage from the 3.3v line internally! (neat!)
//display.begin(SSD1306_SWITCHCAPVCC, 0x3C); // initialize with the I2C addr 0x3C (for the 128x32)
//display.begin(0x3C, false);
if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C))
{
//Serial.println(F("SSD1306 allocation failed"));
for(;;);
}
// init done
display.display();
delay(100);
display.clearDisplay();
display.display();
display.setTextSize(1);
display.setTextColor(WHITE);
if (!bme.begin()) {
//Serial.println("Could not find a valid BME680 sensor, check wiring!");
while (1);
}
// Set up oversampling and filter initialization
bme.setTemperatureOversampling(BME680_OS_8X);
bme.setHumidityOversampling(BME680_OS_2X);
bme.setPressureOversampling(BME680_OS_4X);
bme.setIIRFilterSize(BME680_FILTER_SIZE_3);
bme.setGasHeater(320, 150); // 320*C for 150 ms
}
void loop() {
display.setCursor(0,0);
display.clearDisplay();
if (! bme.performReading()) {
//Serial.println("Failed to perform reading :(");
return;
}
//display.println("--------------------");
//display.println("** Sensor BME680 **");
//display.println("--------------------");
//Serial.print("Temperature = "); //Serial.print(bme.temperature); //Serial.println(" *C");
display.print("Temp: "); display.print(bme.temperature); display.println(" *C");
//Serial.print("Pressure = "); //Serial.print(bme.pressure / 100.0); //Serial.println(" hPa");
display.print("Pres: "); display.print(bme.pressure / 100); display.println(" hPa");
//Serial.print("Humidity = "); //Serial.print(bme.humidity); //Serial.println(" %");
display.print("Humi: "); display.print(bme.humidity); display.println(" %");
//Serial.print("Gas = "); //Serial.print(bme.gas_resistance / 1000.0); //Serial.println(" KOhms");
display.print("Gas : "); display.print(bme.gas_resistance / 1000.0); display.println(" KOhms");
display.println("--------------------");
//Serial.println();
display.display();
delay(2000);
}
this is how it looks like
I suspect it might be a memory issue but the Adafruit examples work all fine even when I add more code to them to fill up the memory for testing.
actionally many times I have some problems with the Adafruit libraries for OLED and in these cases I need to switch to other libraries.
Has somebody an idea what makes these Adafruit libraries so unreliable?