- #ARDUINO I2C EXAMPLE TWO WAY DATA COMMUNICATION HOW TO#
- #ARDUINO I2C EXAMPLE TWO WAY DATA COMMUNICATION SERIAL#
- #ARDUINO I2C EXAMPLE TWO WAY DATA COMMUNICATION CODE#
However, these displays have a small problem. These values can be either a simple text or numerical values read by the sensors, such as temperature or pressure, or even the number of cycles that the OSOYOO Basic Board is performing. The integration of an LCD display greatly facilitates the interactivity of the project you are developing, allowing the user to directly read some output parameters.
#ARDUINO I2C EXAMPLE TWO WAY DATA COMMUNICATION HOW TO#
Finally you will see how to program it with a simple example showing how to display text on the display.
In this lesson we will show how to mount a LCD display on your Arduino using the I2C communication. If you have difficulty setting up I2C communication between different devices, don’t hesitate to leave us a comment or contact us.Note: ALL OSOYOO Products for Arduino are Third Party Board which is fully compatitable with Arduino Contentĭuring the building of your projects for Arduino, you’ll often need to read the output data directly from a LCD display.
Wire.requestFrom () handles the request receive function.Wire.write () allows you to send bytes.Function argument may be empty for master devices Wire.begin () initializes the device address.
#ARDUINO I2C EXAMPLE TWO WAY DATA COMMUNICATION SERIAL#
The functions are similar to the Serial library. The Wire.h library allows you to easily define the serial communication on the I2C bus. Generally, one card will send information (Writer) and another will receive it (Reader).
#ARDUINO I2C EXAMPLE TWO WAY DATA COMMUNICATION CODE#
In order for the two cards to communicate with each other, they must be connected correctly (A4 with A4 and A5 with A5) and do not forget to connect the earths (GND) as shown in the following diagram.Ĭaution: If pins A4 and A5 are connected to the pins of a non-powered card, the code will freeze at the time of transmission. In this example we use an Arduino Uno board, so the pins A4 and A5. One on which the data is sent (SDA Serial Data Line) and on the other the synchronization clock (SLC Serial Clock Line). The pins used by I2C communication are usually fixed for each device. For that, we have to write at least two programs, one for the “Mistress” card (Master) and the other for the “Slaves” cards.Īn I2C communication is defined by a two-wire bus (sometimes called TWI, Two Wire Interface) and an address. An interesting example is the communication between several Arduino boards. With the I2C protocol, it is also possible to communicate between different systems (sensors, LCD screen, Raspberry Pi, etc.).
We had seen the communication via the Serial port (called UART) which is used to send the code to the Arduino by a computer or to connect two devices in particular in Bluetooth. It allows asynchronous connections between several components to share information via a “common bus”. The I2C protocol is a method which makes it possible to connect several “Master” cards and several “Slave” cards and to communicate up to 128 devices. One of the commonly used techniques is the I2C (or TWI) protocol. It can be practical, especially in home automation projects, to communicate between several devices.