Turning 0.91" display on command

Other Hardware Displays
1

I made a voltmeter and thermometer using the Atmega 328P - AU but a problem appeared! I want to provide power to the display by using the PB5 pin. However, no image is displayed here is my code:

// 128x32_OLED_Hello_World_u8glib
// based on the Olikraus u8glib library supporting I2C graphic displays
// public domain

#include <U8glib.h>

U8GLIB_SSD1306_128X32 u8g(U8G_I2C_OPT_NONE | U8G_I2C_OPT_DEV_0);

void setup(void)
{
pinMode(5, OUTPUT); //configure PD5 pin as output
//Set font.
u8g.setFont(u8g_font_unifont);
u8g.setColorIndex(1); // display draws with pixel on
}
void loop(void)
{
digitalWrite(5, HIGH); //turn the display on
u8g.firstPage();
do {
draw();
} while (u8g.nextPage());
delay(50);
}
void draw(void)
{
u8g.setFont(u8g_font_helvB14); // font change – helvB14
u8g.drawStr(20, 13, "Hello");
u8g.setFont(u8g_font_unifont); // font change – standard
u8g.drawStr(20, 28, "World");

u8g.drawCircle (110, 15, 15); // contour
u8g.drawCircle (105, 14, 4); // left eye
u8g.drawCircle (115, 14, 4); // right eye

u8g.drawPixel (103,22); // mouth
u8g.drawPixel (118,22); // mouth
u8g.drawPixel (104,23); // mouth
u8g.drawPixel (117,23); // mouth
u8g.drawPixel (105,24); // mouth
u8g.drawPixel (116,24); // mouth
u8g.drawLine (106, 25, 115,25); // mouth
}

Can someone spot my mistake because it compiles just perfectly but there is no display output :slight_smile:?

2

PB5 != 5 according to this

image
image1242×1283 103 KB

3

be sure your oled display is 5v tollerant
(most newer one's are, but some older ones use 3v3)

1 Like
4

I tried changing the pin number and reuploading the sketch but nothing changed :frowning:

5

put a LED with resistor on that pin and make sure it lights up

1 Like
6

Hi net_worker,

You appear to be missing a couple of items for the display -

1. The display "begin" command in the Setup

 u8g2.begin();

You will need to issue this "begin" command after applying power to the display.

2. The Wire library for the I2C

#include <Wire.h>

HTH?

7

Thank you very much ! The problem is solved :grin:!

8

Your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with (nor for advice on) your project.

9

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