Hi, I am currently working on a project where I am using an Arduino Mega, a Bosch temperature/pressure sensor and a 2.23" Waveshare SSD1306 display.
At the moment I am having the problem that after a few minutes the text on the screen starts to glitch or is moving a few pixels randomly. Is my screen broken or is my code just shit?
Attached are some pictures and the code.
How it should be:
How it is after a few minutes:
//Import von Librarys
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
//Pixel Anzahl vom Display definiert
#define SCREEN_WIDTH 132 // OLED display width, in pixels
#define SCREEN_HEIGHT 32 // OLED display height, in pixels
//Declaration for SSD1306 display connected using software SPI (default case):
#define OLED_MOSI 13
#define OLED_CLK 12
#define OLED_DC 10
#define OLED_CS 11
#define OLED_RESET 9
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT,
OLED_MOSI, OLED_CLK, OLED_DC, OLED_RESET, OLED_CS);
//Pin vom Drucksensor
const int sensorPin = A5;
//Pin vom Temperatursensor
#define TempSensorDivider 2000 //defines the resistor value that is in series in the voltage divider
#define TempSensorPin A0 //defines the analog pin of the input voltage from the voltage divider
#define NUMSAMPLES 20 //defines the number of samples to be taken for a smooth average
//Steinhart Werte Bosch Sensor
const float steinconstA = 0.00129206139224324; //steinhart equation constant A, determined from wikipedia equations
const float steinconstB = 0.000260792592983294; //steinhart equation constant B, determined from wikipedia equations
const float steinconstC = 0.00000016891624679306; //steinhart equation constant C, determined from wikipedia equations
int samples[NUMSAMPLES];
void setup() {
Serial.begin(9600);
// SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
if(!display.begin(SSD1306_SWITCHCAPVCC)) {
Serial.println(F("SSD1306 allocation failed"));
for(;;); // Don't proceed, loop forever
}
display.clearDisplay();
display.drawLine(66,0,66,32, SSD1306_WHITE);
}
void loop() {
//Feste Werte im Display
display.setTextSize(1);
display.setTextColor(WHITE);
display.setCursor(5, 20.5);
display.print("Oil T:");
display.setCursor(70, 20.5);
display.print("Oil P:");
display.setCursor(126, 20.5);
display.print("B");
ZahlenLoop();
}
void ZahlenLoop() {
while (true) {
uint8_t i; //integer for loop
float average; //decimal for average
for (i=0; i<NUMSAMPLES; i++) {
samples[i] = analogRead(TempSensorPin); //takes samples at number defined with a short delay between samples
delay(10);
}
average = 0;
for (i=0; i< NUMSAMPLES; i++) {
average += samples[i]; //adds all number of samples together
}
average /= NUMSAMPLES; //divides by number of samples to output the average
average = (TempSensorDivider*average)/(1023-average); //conversion equation to read resistance from voltage divider
float steinhart; //steinhart equation to estimate temperature value at any resistance from curve of thermistor sensor
steinhart = log(average); //lnR
steinhart = pow(steinhart,3); //(lnR)^3
steinhart *= steinconstC; //C*((lnR)^3)
steinhart += (steinconstB*(log(average))); //B*(lnR) + C*((lnR)^3)
steinhart += steinconstA; //Complete equation, 1/T=A+BlnR+C(lnR)^3
steinhart = 1.0/steinhart; //Inverse to isolate for T
steinhart -= 273.15; //Conversion from kelvin to celcius
Serial.print("Temperature = ");
Serial.print(steinhart); //prints final temp in celcius
Serial.println(" *C");
int sensorValue = analogRead(sensorPin); // Lese den Wert vom Sensor
float voltage = sensorValue * (5.0 / 1023.0); // Wandelt den Sensorwert in Spannung um
// Umrechnung der Spannung in Druck (Bar)
float pressure = (voltage - 0.5) * 10.0 / 4.0;
// Sicherstellen, dass der Druck nicht negativ wird (falls Spannung unter 0.5V fällt)
if (pressure < 0) {
pressure = 0;
}
// Ausgabe des Drucks im seriellen Monitor
Serial.print("Druck: ");
Serial.print(pressure, 1); // Ausgabe mit einer Nachkommastelle
Serial.println(" Bar");
//Ausgaben im Display
display.setTextColor(WHITE, BLACK);
display.setCursor(41,20.5);
int Temp = int(steinhart);
display.print((String)Temp+"C");
display.setCursor(106,20.5);
display.print(pressure,1);
display.display();
delay(1000);
}
}
