raspberry pi lcd module 20x4 in stock

This module plugs right onto the GPIO connector of your Raspberry Pi, and provides it with a 20x4 character display, 6 pushbuttons, a temperature sensor, and an analog input. A version with a built-in real-time clock is also available, so that your Pi always knows the exact time, internet acces or not.

A 20 x 4 LCD display means it can display 20 characters per line and there are 4 such lines. In this LCD each character is displayed in 5x7 pixel matrix.

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This module is an Arduino compatible LCD display module with high speed I²C interface. It can display 20×4 characters (white characters on a blue background).

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When we talk about interfacing displays with microcontrollers for an embedded project, alpha numeric Liquid Crystal Displays (LCD) are the most commonly used displays which are usually based on Hitachi HD44780 Driver. They are low powered, robust LCDs that are capable of displaying various characters in 5X8 or 8X10 pixel matrix. In this article, we will be interfacing an HD44780 based 20x4 alpha numeric LCDwith raspberry pi 4, also, we will try to print a string, scroll text, create new custom characters, and a lot more.

In this tutorial, you will be learning the use of different functions of an open source library RPLCD from PyPI. Further, you can create your own custom functions like scrolling texts, custom Characters, etc.

Here is the list of components required. I am using raspberry pi 4 for this project you can use anyone, also while purchasing the LCD try to buy the original Hitachi HD44780 based LCD so that we can rely on the robustness of our components.

This LCD has an HD44780 driven circuit that behaves as the heart of the LCD. See Datasheet of HD44780 for more details. As far as the interfacing of this LCD is concerned, you can interface it with raspberry pi in both ways either in I2C based or direct pins based, but if you are using the direct pins, it will require 14 pins of raspberry pi, also it consumes the SPI port if you are using it in 8 bit mode for the transmission. Today we are using it in I2C mode for interfacing.

For the connections and raspberry pi settings for LCD in I2C mode, you can visit CircuitDigest official website. Also, for the GPIO connections of the raspberry pi in case of having no I2C module you can connect it as follows

RPLCD will take the necessary smbus automatically. Here as soon as you successfully install the library, you will be asked to set the address of the i2c and expender as usually i2c can be made using PCF8574 or MCP2308 or MCP23017. Here we will have PCF8574 I2C Expander at 0x27 address (learn how to find the i2c address of your device).

Here we are using LCD in 4bit Mode so i2c will be worked in that mode only, however, the i2c library is not available for using it in 8 bit mode, this can be done by avoiding use of i2c at this time, use GPIOs interfacing instead for using it in 8 bit mode.

Now it’s the time for printing ‘Hello world’ on your LCD, for doing that you need to create a new python file name it by your choice. Write the following code for printing your very first string on the LCD.

Here you can see that the RPLCD contains i2c.py and by importing it you are getting all the methods written in the "i2c.py". Now in the argument on CharLCD() you can pass the I2C name and the address of it, mine is 0x27, and m using PCF8574

By simply writing this you can print any string. You just pass the string in lcd.write_string(). You may change the position of the string by adjusting the cursor_pos(m,n) where m is the no. row (from 0 to 3 for 20x4 LCD) and n is the no. of column (from 0 to 19 for 20x2 LCD).

Remember that you can only print text in string format as lcd.write_string() function can only display string not the integer value. If you still want to display numbers then you can do it after converting the integer in string by any type casting method. It can display the long text in two lines of the LCD until auto_linebreak() is disabled.dd

In the above code, we are using the frame buffer method to display long strings. After creating the 2-dimensional list having rows and columns for 20x4 LCD.

Here location is the memory location of the character, and bitmap tuple is the binary information stored in 5 bits in each 8 Elements. Here 5 and 8 represents the 5X8 character sets as our LCD has 20x4 characters and each character is made up of 5x8 pixel matrics. Usually, 8x10 or 5x8 pixel matrix is used to represent all the possible English characters in an LCD.

Our LCD has a memory of creating 8 new custom characters as of now. Each of it can be stored in any of x00 to x07. For calling it we will directly call the created character.

First, we will create facial characters in four pieces i.e., Bottom Left LB, Left Top LT, Right Top RT, Right Bottom RB. Here I have used an online tool for creating this character. You can use any.

Hence, we have done with the initializing setup of interfacing 20x4 LCD with i2C with our Raspberry Pi, also we get to know about the character creation in the LCD, and also, we have created multiple pixel characters. We have seen how a long string can be displayed using the scrolling text technique.