#Arduino lcd library qc2004a serial

So I find that the display has address 16 # 27.

With a simple ST program I execute the function call SysI2CWrRd trying to pass I2C addresses from 16 # 20 up and check the return of the function. Since looking at the characteristics of the 'PCF8574 Remote 8-bit I / O expander for I2C-bus' I find multiple indications on its range of addresses, I check if the chip actually has the address 16 # 3F or not. I receive a compatible Arduino display from YwRobot from a customer ( See photos), the customer sends it to me to test as with the example program of the previous post the display continues to show nothing.Д¬onnected to the CPU module SlimLine in fact I check that the display is not managed. Here is the display connected to a CPU Compact module ( See photos), I attach program download. To be able to send 8-bit commands in a simple way I created the function LCDOut8Bit.ДЇor the definition of the messages the HMI management integrated in LogicLab is used, which allows to configure the type of LCD used and to define the variables to be displayed in addition to the texts ( Screenshot). Upon power-up, the Hitachi controller is set up for a 4-bit interface and the 8-bit commands must be sent as a sequence of two consecutive 4-bit commands. In the project as seen from print, The function ArduinoLCD initialises and displays the data on the display.

P0 -> Rs, P1 -> R/W, P2 -> En, P3 -> Backlight, P4 -> D4, P5 -> D5, P6 -> D6, P7 -> D7.ДЄs you can see, all the display control signals are simulated with I / O pins of the I / O expander and the display is managed with a 4-bit interface. I have not found a wiring diagram, but given the extreme simplicity of the module I have obtained the connections between the I / O chip and the display. In these modules instead of an LCD display with native I2C interface, a PCF8574 'Remote 8-bit I / O expander for I2C-bus is used to manage the control signals of a QC2004A Systronix parallel interface display based on the Hitachi HD44780U controller.

#Arduino lcd library qc2004a serial

Following the interest raised by this topic, given the availability of Arduino compatible displays, I decided to create a project for the management of an LCD 4 * 20 IIC / I2C / TWI 1602 Serial LCD Module Display For Arduino UNO MEGA R3 by SainSmart.