Reading from the LK204-7T-1U Intelligent I2C LCD requires a little more setup: reporting mode should be set to I2C and auto-transmit of key presses should be turned off. Text as simple strings and commands as character arrays can be passed with their lengths directly to the I2C write function.
With reading and writing sorted, it becomes quite easy to create functions to send data to and read information from a Matrix Orbital Intelligent I2C LCD.
Additional information regarding this wire library code can be found at /en/Reference/WireWrite and /en/Reference/WireRead. Reading can also take three steps: a request, followed by a recommended check for available data, and finally the actual read. Writing is a three step process: the write function is nestled between begin and end transmission calls. To convert addresses, simply shift them one bit to the right: the default 0x50 becomes 0x28.Īll I2C transactions begin with the begin function, which can be added to your setup routine. Please note that Arduino uses a 7bit I2C address while your Matrix Orbital Intelligent I2C LCD uses 8 bits. The Arduino software environment offers a built in I2C library, which can be accessed by including Wire.h in your project. The cable used was again modified, this time from a BBPDC parallel development cable, connections are shown above. The Arduino Uno board offers SDA and SCL connections via analogue input pins A4 and A5 respectively revision 3.0 also has dedicated I2C pins above AREF. No pull-up resistors were used in this demo, but if necessary there are pads below the I2C block. This required that the protocol select resistors be moved from the RS232 serial block to the I2C setting. The display chosen for this demo is an I2C version of the External HMI LCD ELK204-7T which uses the LK204-7T 1U HMI LCD. References for all functions used below can be found on the Arduino website.Ĭonnecting an Intelligent I2C LCD to Arduino Uno Once installed, the Arduinodevelopment environment will centre on a simple, C-based language. Additional information regarding the Arduino Uno development board and compiler used for this project can be found at Our Uno hardware was purchased from the good folks at Solarbotics here in Calgary, The compiler and installation instructions can both be found under the Downloads heading. This application note was created to showcase the ease of use offered by a Matrix Orbital I2C Intelligent LCD in the open source Arduino hardware/software environment.
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