- WIRE.H LIBRARY ARDUINO DOWNLOAD HOW TO
- WIRE.H LIBRARY ARDUINO DOWNLOAD INSTALL
- WIRE.H LIBRARY ARDUINO DOWNLOAD CODE
The display connects to Arduino using only four wires – two for power and two for data, making the wiring very simple.
WIRE.H LIBRARY ARDUINO DOWNLOAD HOW TO
Libraries are then installed and some example programs run which show how to use the display in an Arduino sketch. Upon execution of the program, the “Hello World” message should appear on your display, as shown in figure 3.įigure 3 – Hello World message drawn on the display.In this tutorial a 0.96 inch monochrome OLED display from Geekcreit is connected or interfaced to an Arduino. To test the code, simply compile it and upload it to your ESP32 board using the Arduino IDE, after performing the connections specified in the diagram of figure 1. The string we just drawn will then stay on the display as long as it is connected. Since we are not going to change the content of the display, we may leave an empty Arduino loop function. This method receives as first and second arguments the x and y coordinates where the string will be drawn on the display, and as third argument it receives a String with the actual content.įinally, to send the content to the display to be effectively drawn, we need to call the display method on our object. To do so, we can call the drawString method of the display object.
For this simple example, we will draw a very simple “Hello World” message. Next we can start drawing on the display. This method receives no arguments and returns void.
Now, on the setup function, we will initialize the display by calling the init method of the display object. In our case, as shown in the schematic diagram, we are using pins 21 and 22 of the ESP32. As second and third parameters, the constructor receives the number of the SDA and SCL pins, respectively. The constructor for the mentioned class receives as first parameter the I2C address of the device, which is 0x3c. Next, we will need to declare an object of class SSD1306, which will make available the functions needed to draw in the display. We will also need to include the SSD1306.h library, which we will use to interact with the device. To get started, we will need to include the Wire.h library, which is needed for the I2C communication with the OLED display.
WIRE.H LIBRARY ARDUINO DOWNLOAD CODE
The code for this tutorial will be very simple since the library we have just installed has a very easy to use API. You should consult the pin mapping of your board to confirm, before proceeding with the actual connections.įigure 2 – Electric diagram between the ESP32 and the SSD1306 OLED display. Please note that depending on your development board, the names or numbers labeled on the pins may not directly match with the ones of the ESP32 microcontroller. Since the SSD1306 can operate at 3.3 V, we can use the the 3.3 V supply pin that most ESP32 boards have to power the display. We are using the ESP32 pins 21 and 22 as I2C SDA and SCL, respectively. The electric diagram can be seen below at figure 2. Thus, besides the power supply, we will only need two wires between the devices. The ESP32 will interact with the SSD1306 display via I2C. It can also be obtained as part of this starter kit. You can check here the GitHub page of the library, which details the API available to interact with the display.įor this tutorial an Elecrow’s version of the OLED was used. You can check below at figure 1 the library, which can be installed via Arduino IDE library manager.
WIRE.H LIBRARY ARDUINO DOWNLOAD INSTALL
In order to facilitate the interaction with the display, we will need to install a library that supports the mentioned display model and can be used on the ESP32.
The objective of this post is to explain how to connect the ESP32 to a SSD1306 OLED display and show a “Hello World” message, using the Arduino core. The objective of this post is to explain how to connect the ESP32 to a SSD1306 OLED display and print a “Hello World” message, using the Arduino core. For this tutorial, an Elecrow’s version of the OLED was used.
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