Hello,
I'm have an 0.96 OLED Display (like this one).
I use the "Adafruit_SSD1306" library.
The example code works fine, but I can't seem to get it to work outside the "void setup"
I found a few examples, but most of them use code to display in there setup or use a different screen / library.
Sort intro what I'm trying to do:
Check 2 temperatures, compare them, turn a relay on or off and display the temperature and relay status to the LCD.
My Problem:
The display stays black, after it displayed the logo.
The Serial Monitor only outputs 3 blank lines, where it is suppose to show the Display content.
My code:
#include <OneWire.h>
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
// OneWire DS18S20, DS18B20, DS1822 Temperature Example
// http://www.pjrc.com/teensy/td_libs_OneWire.html
// The DallasTemperature library can do all this work for you!
// http://milesburton.com/Dallas_Temperature_Control_Library
// If using software SPI (the default case):
#define OLED_MOSI 9 //D1
#define OLED_CLK 10 //D0
#define OLED_DC 11 //DC
#define OLED_CS 12 //CS
#define OLED_RESET 13 //RES
Adafruit_SSD1306 display(OLED_MOSI, OLED_CLK, OLED_DC, OLED_RESET, OLED_CS);
#define NUMFLAKES 10
#define XPOS 0
#define YPOS 1
#define DELTAY 2
#define LOGO16_GLCD_HEIGHT 16
#define LOGO16_GLCD_WIDTH 16
#if (SSD1306_LCDHEIGHT != 64)
#error("Height incorrect, please fix Adafruit_SSD1306.h!");
#endif
OneWire ds(8); // on pin 8 (a 4.7K resistor is necessary)
const int relaispin = 5;
bool ticktock = TRUE;
float tempout, tempin, tempinzone;
float tempdiv = 2;
bool relais = FALSE;
String relaistxt = "off";
String firstline = "firstline";
String secondline = "secondline";
String thirdline = "thirdline";
void setup(void) {
Serial.begin(9600);
pinMode(relaispin, OUTPUT);
display.begin(SSD1306_SWITCHCAPVCC);
display.display(); // show splashscreen
delay(1000);
display.clearDisplay(); // clears the screen and buffer
}
void loop(void) {
byte i;
byte present = 0;
byte type_s;
byte data[12];
byte addr[8];
float celsius;
if ( !ds.search(addr)) {
ds.reset_search();
delay(250);
return;
}
if (OneWire::crc8(addr, 7) != addr[7]) {
Serial.println("CRC is not valid!");
return;
}
ds.reset();
ds.select(addr);
ds.write(0x44);
delay(1000);
present = ds.reset();
ds.select(addr);
ds.write(0xBE);
for ( i = 0; i < 9; i++) { // we need 9 bytes
data[i] = ds.read();
}
// Convert the data to actual temperature
// because the result is a 16 bit signed integer, it should
// be stored to an "int16_t" type, which is always 16 bits
// even when compiled on a 32 bit processor.
int16_t raw = (data[1] << 8) | data[0];
if (type_s) {
raw = raw << 3; // 9 bit resolution default
if (data[7] == 0x10) {
// "count remain" gives full 12 bit resolution
raw = (raw & 0xFFF0) + 12 - data[6];
}
} else {
byte cfg = (data[4] & 0x60);
// at lower res, the low bits are undefined, so let's zero them
if (cfg == 0x00) raw = raw & ~7; // 9 bit resolution, 93.75 ms
else if (cfg == 0x20) raw = raw & ~3; // 10 bit res, 187.5 ms
else if (cfg == 0x40) raw = raw & ~1; // 11 bit res, 375 ms
//// default is 12 bit resolution, 750 ms conversion time
}
celsius = (float)raw / 16.0;
if (ticktock) {
tempout = celsius;
ticktock = FALSE;
}
else {
tempin = celsius;
ticktock = TRUE;
}
tempinzone = tempin + tempdiv;
if (tempout > tempinzone) {
relais = TRUE;
digitalWrite(relaispin, HIGH);
}
else {
relais = FALSE;
digitalWrite(relaispin, LOW);
}
Serial.print(" Temperature = ");
Serial.print(tempin);
Serial.print(" Celsius insite and ");
Serial.print(tempout);
Serial.print(" Celsius outsite. The Relais is");
if (relais) {
Serial.println(" on.");
}
else {
Serial.println(" off.");
}
char buffer[5];
String tempintxt = dtostrf(tempin, 5, 1, buffer);
String tempouttxt = dtostrf(tempout, 5, 1, buffer);
String firstline = "IN: " + tempintxt;
String secondline = "OUT: " + tempouttxt;
if (relais) {
relaistxt = " on";
}
else {
relaistxt = "off";
}
String thirdline = "Fan: " + relaistxt;
Serial.println(firstline);
Serial.println(secondline);
Serial.println(thirdline);
// display text
display.setTextSize(2);
display.setTextColor(WHITE);
display.setCursor(0, 0);
display.println(firstline);
display.println(secondline);
display.println(thirdline);
display.display();
delay(2000);
display.clearDisplay();
}
And the Serial Output:
Temperature = 28.50 Celsius insite and 29.50 Celsius outsite. The Relais is off.
Temperature = 28.50 Celsius insite and 29.50 Celsius outsite. The Relais is off.
Temperature = 28.50 Celsius insite and 29.50 Celsius outsite. The Relais is off.
Thank you,
Alex
