![]() ![]() Inspect your code for invalid display instructions Check for the missing command, if your display is not getting updated. This statement should be executed every time whenever changes are made in the display contents. Check program for display.display() commandįor programming of OLED display, display.display() is a necessary command in order to display the contents. OLED display needs input voltage around 3.7v to 6v. If you are powering your OLED display by an onboard power source and the board itself powered by Computer/Laptop USB, then try powering it with the external power source. Resolution definitions in the library file Power source of your OLED Display ![]() You need to uncomment the statement which defines the resolution of your display and comment all other statements.From the library folder, open Adafruit_SSD1306.h file.Open “My Computer” > Documents > Arduino > libraries > Adafruit_SSD1306.To make necessary changes, follow the steps below: In the library file, you need to change the header file. #define OLED_RESET -1 // Reset pin # (or -1 if sharing Arduino reset pin)Īdafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET) #define SCREEN_HEIGHT 64 // OLED display height, in pixels #define SCREEN_WIDTH 128 // OLED display width, in pixels The following code snippet shows the block where we declare size and executes the command for OLED display. Depending on the resolution of the OLED display, you may need to make necessary changes in the program. Resolution is also defined in the library of the OLED display. It will find the address of the connected peripheral. If both of the above addresses won’t work, you should try using the I2C device scanner program. #define OLED_ADDR 0x3C // here address is 0x3C for 128x32 display #define OLED_ADDR 0x3D // here address is 0x3D for 128圆4 display Following are the two addresses for the OLED displays currently available in the market. Here, address I2C address is different for different resolutions of the display. Before programming, make sure the address of your I2C display is proper. Most of the time, the address may be the main cause of the failure of your OLED display. In one of the variants, it comes with a reset pin and another one is without a reset pin.Ĭode statement for displays with Reset pin: #define OLED_RESET 4 //if reset pin is connected to pin 4 Address of your I2C OLED display OLED Display pin connection with different boards Type of OLED displayĪs mentioned in the previous post, I2C OLED comes with different variants. If you have the wrong connections, then the display will not even start! So following is a pin connection for some popular development boards. Possible reasons behind non-working OLED display Pin Connection of OLED DisplayĬheck the proper pin-out. Whether you interface OLED with Arduino, NodeMCU, or any other board, there are some common checks you should do before thinking your OLED is dead. You bought an OLED display, made connections, uploaded a demo code, BUT the display did not light up! You did try a lot of different things but no luck? Then you are in right place. 2.7 Inspect your code for invalid display instructions. ![]() 2.6 Check program for display.display() command.2 Possible reasons behind non-working OLED display. ![]()
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