china i2c iic oled lcd module free sample

This article shows how to use the SSD1306 0.96 inch I2C OLED display with the Arduino. We’ll show you some features of the OLED display, how to connect it to the Arduino board, and how to write text, draw shapes and display bitmap images. Lastly, we’ll build a project example that displays temperature and humidity readings.

The organic light-emitting diode(OLED) display that we’ll use in this tutorial is the SSD1306 model: a monocolor, 0.96-inch display with 128×64 pixels as shown in the following figure.

The OLED display doesn’t require backlight, which results in a very nice contrast in dark environments. Additionally, its pixels consume energy only when they are on, so the OLED display consumes less power when compared with other displays.

The model we’re using here has only four pins and communicates with the Arduino using I2C communication protocol. There are models that come with an extra RESET pin. There are also other OLED displays that communicate using SPI communication.

Because the OLED display uses I2C communication protocol, wiring is very simple. You just need to connect to the Arduino Uno I2C pins as shown in the table below.

To control the OLED display you need the adafruit_SSD1306.h and the adafruit_GFX.h libraries. Follow the next instructions to install those libraries.

After wiring the OLED display to the Arduino and installing all required libraries, you can use one example from the library to see if everything is working properly.

This is an example for our Monochrome OLEDs based on SSD1306 drivers. Pick one up today in the adafruit shop! ------> http://www.adafruit.com/category/63_98

The Adafruit library for the OLED display comes with several functions to write text. In this section, you’ll learn how to write and scroll text using the library functions.

First, you need to import the necessary libraries. The Wire library to use I2C and the Adafruit libraries to write to the display: Adafruit_GFX and Adafruit_SSD1306.

Then, you define your OLED width and height. In this example, we’re using a 128×64 OLED display. If you’re using other sizes, you can change that in the SCREEN_WIDTH, and SCREEN_HEIGHT variables.

The (-1) parameter means that your OLED display doesn’t have a RESET pin. If your OLED display does have a RESET pin, it should be connected to a GPIO. In that case, you should pass the GPIO number as a parameter.

To draw a pixel in the OLED display, you can use the drawPixel(x, y, color) method that accepts as arguments the x and y coordinates where the pixel appears, and color. For example:

In this section we’ll build a project that displays temperature and humidity readings on the OLED display. We’ll get temperature and humidity using the DHT11 temperature and humidity sensor. If you’re not familiar with the DHT11 sensor, read the following article:

Note:if you’re using a module with a DHT sensor, it normally comes with only three pins. The pins should be labeled so that you know how to wire them. Additionally, many of these modules already come with an internal pull up resistor, so you don’t need to add one to the circuit.

The code starts by including the necessary libraries. The Wire, Adafruit_GFX and Adafruit_SSD1306 are used to interface with the OLED display. The Adafruit_Sensor and the DHT libraries are used to interface with the DHT22 or DHT11 sensors.

The (-1) parameter means that your OLED display doesn’t have a RESET pin. If your OLED display does have a RESET pin, it should be connected to a GPIO. In that case, you should pass the GPIO number as a parameter.

In this case, the address of the OLED display we’re using is 0x3C. If this address doesn’t work, you can run an I2C scanner sketch to find your OLED address. You can find the I2C scanner sketch here.

After wiring the circuit and uploading the code, the OLED display shows the temperature and humidity readings. The sensor readings are updated every five seconds.

The I2C address for the OLED display we are using is 0x3C. However, yours may be different. So, make sure you check your display I2C address using an I2C scanner sketch.

The OLED display provides an easy and inexpensive way to display text or graphics using an Arduino. We hope you’ve found this guide and the project example useful.

In this tutorial a 0.96 inch monochrome OLED display from Geekcreit is connected or interfaced to an Arduino. Libraries are then installed and some example programs run which show how to use the display in an Arduino sketch.

The display connects to Arduino using only four wires – two for power and two for data, making the wiring very simple. The data connection is I2C (I²C, IIC or Inter-Integrated Circuit). This interface is sometimes called TWI (Two Wire Interface).

The first and most important thing to note is that some of the displays may have the GND and VCC power pins swapped around. Check your display to make sure that it is the same as the image below. If the pins are swapped, make sure to change the connections to the Arduino – OLED VCC connects to 5V on the Arduino, OLED GND to GND on the Arduino.

The image below shows how to connect the Geekcreit 0.96 inch OLED I2C display to Arduino. Pin connections are as follows for wiring the OLED display to an Arduino Uno.

The SSD1306 driver isn"t set up for the Geekcreit OLED display by default. The display size must be changed in the driver before it can be used. If it is not changed, an error message will appear when attempting to verify the example sketch (see the section below) in the Arduino IDE:

If the libraries for the display were installed correctly, example programs for the display will be found in the Arduino IDE under File → Examples → Adafruit SSD1306 – open the ssd1306_128x64_i2c sketch under this menu.

The I²C address must be changed in this sketch in order for it to work with the Geekcreit display. Change the address from 0x3D to 0x3C as shown in the code below. This address is not 0x78 or 0x7A as printed on the back of the OLED board.

If the changes to the driver and example sketch were made correctly and the OLED display is wired to the Arduino correctly, the sketch should start running. The example program starts by showing the Adafruit logo, it then turns on a single pixel. Various graphics and text functions are then displayed.

This section of the tutorial shows how to quickly start using the I2C OLED display with the Adafruit libraries. A quick start Arduino template sketch, text display demo and various graphics functions follow.

The template file below can be used to quickly start new OLED projects. It includes the necessary header files and initialization code for the display. Copy the code and use it as a basis for starting new OLED display projects.

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AZDelivery 0.96 Inch OLED Display I2C SSD1306 Chip 128 x 64 Pixels I2C Display Module with White Characters Compatible with Arduino and Raspberry Pi with E-Book Included!

✔️️ Easy screen connection with Raspberry Pi and other microcontrollers by I2C interface via only four pins! Thanks to the integrated display adapter, the module can be connected to the I2C bus immediately.

✔️️ By changing the I2C direction and soldering a third contact, two displays can be operated simultaneously. The OLED module can be connected to 3.3 V.

Select from the drop-down the device you want to add, in this case «Display - OLED SSD1306» (or, better yet, the «Display - OLED SSD1306 / SH1106 Framed», as I indicate below -recommended-)

If you still want more display options, I recommend that when you select the display in the ESP Easy drop-down menu, you try the «Display - OLED SSD1306 / SH1106 Framed" (instead of "Display - OLED SSD1306» that we have used before).

Note that "Display - OLED SSD1306 / SH1106 Framed» takes some more memory from ESP8266 that the «Display - OLED SSD1306«, so on devices with many sensors connected or many rules long lines could give you memory problems (normally it shouldn"t give you any problems).

If you want you can write directly on the screen from the rules using the command oledframedcmd, , (command must be a single parameter so if it includes spaces or commas you will have to write it between parentheses, as in the following example), which gives you much more control.

Here you can see a CO2 meter prototype with two 1.3 ″ OLED displays, in one it shows the CO2 concentration permanently and in the other it can show different data, such as temperature, humidity, etc.

As we have seen before, the OLED display has an I2C address that the ESP8266, ESP32 or another microcontroller uses to communicate with it. What we need to connect two displays to a single microcontroller is that each display has its own I2C address and simply, we will connect them in parallel and we will use them as if they were two completely independent screens.

IMPORTANT: It is particularly important that you make sure to use OLED displays that allow changing the I2C address (many do not allow it), if not, you will not be able to do it this way (you would need an I2C multiplexer, which complicates things a bit). A little further down I leave you the links to the screens that I use and that allow I2C address change.

For example, this 1.3 ″ OLED screen (larger than the normal ones, which are 0.96″) allows to change I2C addresses, between 0x78 and 0x7A, by moving a resistance:

You can find this 1.3″ SSD1306 display in AliExpress by clicking here. If you prefer a display 0.96 ″ SSD1306 that allows to change the I2C address, I have bought this. Both allow to change the I2C address.

You simply have to add in the configuration (Devices tab) two devices «Display - OLED SSD1306 / SH1106 Framed» (exactly the same as we have seen before with a single screen) and configure each one independently, with the data we want:

Sometimes I2C addresses may not match what you put on the screen (For example, in this screen that I have used, in the silkscreen it says that the addresses are 0x78 and 0x7A but the real addresses are 0x3C and 0x3D.