1602 LCD Hat for Raspberry Pi

Description

Raspberry Pi Hat LCD Plate includes a 16-line and 2-column alphanumeric LCD display, an RGB LED, contrast-trimmer trimmer and keyboard.

This board has an I2C interface, based on the integrated MCP3017 circuit board, an I / O expansion chip that allows control of the 2-pin LCD from Raspberry Pi.

Specifications

• 16-line, 2-column alphanumeric LCD
• Integrated RGB LED
• Trimmer to adjust contrast
• Keyboard
• I2C interface

Instructions for use

We recommend using the Raspibian operating system for this LCD.

First we update packages:

sudo apt-get update

sudo apt-get upgrade

Install git:

sudo apt-get install git-core

Download Wiring Pi:

git clone git://git.drogon.net/wiringPi

We compile Pi Wiring:

cd wiringPi

/build

We enable the I2C interface from the advanced options menu of raspi-config:

sudo raspi-config

Now the board must be reset to start with I2C enabled. After restart I2C load the I2C driver and scan the I2C bus:

sudo modprobe i2c-dev

sudo i2cdetect -y -a 1

Now a device identified on I2C at 0x20 has to appear.

To test the LCD, write the following code in the lcd1602.c file:

#include <stdio.h>                                                                        
#include <wiringPi.h>                                                             
#include <mcp23017.h>
#include <lcd.h>
 
int main ()
{
        int display, i, count;
        wiringPiSetup ();
        mcp23017Setup (100, 0x20);
        printf ("Raspberry Pi - MCP23017 Test");
        for (i = 0; i <16; i ++)
          pinMode (100 + i, output);
        digitalWrite (114.0);
        display = lcdInit (2,16,4,115,113,112,111,110,109,0,0,0,0);
        lcdHome (display);
        lcdClear (display);
        lcdPosition (display, 0.0);
        lcdPuts (display, "Hello World");
        while (1)
        {
                lcdPosition (display, 0.1);                                                                                       
                lcdPrintf (display "% d", count ++);
                delay (300);
                printf ( "lcd1602n");
        }
}

We compile the program:

gcc lcd1602.c /home/pi/wiringPi/devLib/lcd.o -lwiringPi -o lcd1602

We run the program and we should see a text on the screen:

./lcd1602

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