{"id":662,"date":"2021-06-25T23:32:04","date_gmt":"2021-06-25T23:32:04","guid":{"rendered":"https:\/\/mc.scsiraidguru.com\/?page_id=662"},"modified":"2024-03-03T15:31:55","modified_gmt":"2024-03-03T15:31:55","slug":"lcd-16x2-i2c","status":"publish","type":"page","link":"https:\/\/mc.scsiraidguru.com\/index.php\/i2c\/lcd-16x2-i2c\/","title":{"rendered":"LCD 16\u00d72 I2C"},"content":{"rendered":"\t\t
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The LCD 16\u00d72 I2C device also shared 0x27<\/p><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/section>

I had to find the soldering iron and solder shut A0, A1, or A2.<\/p>

A0 = 1
A1 = 2
A2 = 4<\/p>

I did A2.\u00a0 The address changed from 0x27 to 0x23.\u00a0<\/p><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/section>

Scanning\u2026
I2C device found at address 0x01 !
I2C device found at address 0x02 !
I2C device found at address 0x03 !
I2C device found at address 0x04 !
I2C device found at address 0x23 !
I2C device found at address 0x27 !<\/p><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/section>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Each I2C LCD screen has three pads: A0, A1, and A2.\u00a0 Below is the table that shows how to solder the pads to change the address.\u00a0\u00a0 Below the table is a picture of the I2C LCD screen pads on the right side.\u00a0\u00a0 Soldering them can be tricky to do.\u00a0\u00a0<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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A0<\/td>A1<\/td>A2<\/td>Hex<\/td><\/tr>
open<\/td>open<\/td>open<\/td>0x27<\/td><\/tr>
closed<\/td>open<\/td>open<\/td>0x26<\/td><\/tr>
open<\/td>closed<\/td>open<\/td>0x25<\/td><\/tr>
closed<\/td>closed<\/td>open<\/td>0x24<\/td><\/tr>
open<\/td>open<\/td>closed<\/td>0x23<\/td><\/tr>
closed<\/td>open<\/td>closed<\/td>0x22<\/td><\/tr>
open<\/td>closed<\/td>closed<\/td>0x21<\/td><\/tr>
closed<\/td>closed<\/td>closed<\/td>0x20<\/td><\/tr><\/tbody><\/table>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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#include <LiquidCrystal.h>
#include <Wire.h>

Is missing from the code below due to WordPress formatting<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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\/\/ Include the required Wire library for I2C
\/\/ Include the libraries:
\/\/ LiquidCrystal_I2C.h: https:\/\/github.com\/johnrickman\/LiquidCrystal_I2C
#include <LiquidCrystal.h> \/\/ Library for I2C communication
#include  <Wire.h> \/\/ Library for LCD<\/pre>
\u00a0<\/p><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/section>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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\/\/ Wiring: SDA pin is connected to A4 and SCL pin to A5.
\/\/ Connect to LCD via I2C, default address 0x27 (A0-A2 not jumpered)
LiquidCrystal_I2C lcd16x2_23 = LiquidCrystal_I2C(0x23, 16, 2); \/\/ Change to (0x23,16,2) for 16\u00d72 LCD.
LiquidCrystal_I2C lcd20x4_27 = LiquidCrystal_I2C(0x27, 20, 4); \/\/ Change to (0x27,20,4) for 20\u00d74 LCD.

#include
int x = 0;
int LED = 13;

void setup()
{

\/\/ Initiate the LCD:
lcd16x2_23.init();
lcd16x2_23.backlight();

lcd20x4_27.init();
lcd20x4_27.backlight();

\/\/ I2C counter for LEDs 
pinMode (LED, OUTPUT);
\/\/ Start the I2C Bus as Master
Wire.begin();
\/\/ I2C counter for LEDs

\/*
\/\/ I2C Scanner Code
Serial.begin(9600);
while (!Serial); \/\/ wait for serial monitor
Serial.println(\u201c\\nI2C Scanner\u201d);
\/\/ I2C Scanner Code
*\/

}

void loop() {
\/\/LCD I2C 160X2_23
lcd16x2_23.setCursor(3, 0); \/\/ 4th column 1st row
lcd16x2_23.print(\u201cI am 0x23\u201d);

\/\/LCD I2C 20X4
lcd20x4_27.setCursor(3, 0); \/\/ 4th column 1st row
lcd20x4_27.print(\u201cWelcome aboard\u201d);

lcd20x4_27.setCursor(8, 1); \/\/ 9th column 2nd row
lcd20x4_27.print(\u201cthe\u201d);

lcd20x4_27.setCursor(6, 2); \/\/ 7th column 3rd row
lcd20x4_27.print(\u201cHeart of\u201d);

lcd20x4_27.setCursor(2, 3); \/\/ 3rd column 4th row
lcd20x4_27.print(\u201cStainless Steel\u201d);
\/\/LCD I2C 20X4

\/\/ I2C counter for LEDs 
x++; \/\/ Increment x

\/\/From Left to Right
\/\/ First UNO
Wire.beginTransmission(1); \/\/ transmit to device #1
Wire.write(x); \/\/ sends x
Wire.endTransmission(); \/\/ stop transmitting

\/\/Second UNO
Wire.beginTransmission(2); \/\/ transmit to device #2
Wire.write(x); \/\/ sends x
Wire.endTransmission(); \/\/ stop transmitting

\/\/Mega in the Middle

\/\/Third UNO
Wire.beginTransmission(3); \/\/ transmit to device #3
Wire.write(x); \/\/ sends x
Wire.endTransmission(); \/\/ stop transmitting

\/\/Fourth UNO
Wire.beginTransmission(4); \/\/ transmit to device #4
Wire.write(x); \/\/ sends x
Wire.endTransmission(); \/\/ stop transmitting

if ( (x == 3) || (x == 6)) {
digitalWrite(LED, HIGH);
}
else {
digitalWrite(LED, LOW);
}

if (x == 7) x = 0; \/\/ `reset x once it gets 6
delay(1000);
\/\/ I2C counter for LEDs

\/*
\/\/ I2C Scanner Code
byte error, address;
int nDevices;

Serial.println(\u201cScanning\u2026\u201d);

nDevices = 0;
for(address = 1; address < 127; address++ )
{
\/\/ The i2c_scanner uses the return value of
\/\/ the Write.endTransmisstion to see if
\/\/ a device did acknowledge to the address.
Wire.beginTransmission(address);
error = Wire.endTransmission();

if (error == 0)
{
Serial.print(\u201cI2C device found at address 0x\u201d);
if (address<16)
Serial.print(\u201c0\u201d);
Serial.print(address,HEX);
Serial.println(\u201d !\u201d);

nDevices++;
}
else if (error==4)
{
Serial.print(\u201cUnknown error at address 0x\u201d);
if (address<16)
Serial.print(\u201c0\u201d);
Serial.println(address,HEX);
} 
}
if (nDevices == 0)
Serial.println(\u201cNo I2C devices found\\n\u201d);
else
Serial.println(\u201cdone\\n\u201d);

delay(5000); \/\/ wait 5 seconds for next scan
\/\/ I2C Scanner Code
*\/

}

\/\/ Include the required Wire library for I2C
\/\/ Include the libraries:
\/\/ LiquidCrystal_I2C.h: https:\/\/github.com\/johnrickman\/LiquidCrystal_I2C
#include \/\/ Library for I2C communication
#include \/\/ Library for LCD

\/\/ Wiring: SDA pin is connected to A4 and SCL pin to A5.
\/\/ Connect to LCD via I2C, default address 0x27 (A0-A2 not jumpered)
LiquidCrystal_I2C lcd16x2_23 = LiquidCrystal_I2C(0x23, 16, 2); \/\/ Change to (0x23,16,2) for 16\u00d72 LCD.
LiquidCrystal_I2C lcd20x4_27 = LiquidCrystal_I2C(0x27, 20, 4); \/\/ Change to (0x27,20,4) for 20\u00d74 LCD.

#include
int x = 0;
int LED = 13;

void setup()
{

\/\/ Initiate the LCD:
lcd16x2_23.init();
lcd16x2_23.backlight();

lcd20x4_27.init();
lcd20x4_27.backlight();

\/\/ I2C counter for LEDs 
pinMode (LED, OUTPUT);
\/\/ Start the I2C Bus as Master
Wire.begin();
\/\/ I2C counter for LEDs

\/*
\/\/ I2C Scanner Code
Serial.begin(9600);
while (!Serial); \/\/ wait for serial monitor
Serial.println(\u201c\\nI2C Scanner\u201d);
\/\/ I2C Scanner Code
*\/

}

void loop() {
\/\/LCD I2C 160X2_23
lcd16x2_23.setCursor(3, 0); \/\/ 4th column 1st row
lcd16x2_23.print(\u201cI am 0x23\u201d);

\/\/LCD I2C 20X4
lcd20x4_27.setCursor(3, 0); \/\/ 4th column 1st row
lcd20x4_27.print(\u201cWelcome aboard\u201d);

lcd20x4_27.setCursor(8, 1); \/\/ 9th column 2nd row
lcd20x4_27.print(\u201cthe\u201d);

lcd20x4_27.setCursor(6, 2); \/\/ 7th column 3rd row
lcd20x4_27.print(\u201cHeart of\u201d);

lcd20x4_27.setCursor(2, 3); \/\/ 3rd column 4th row
lcd20x4_27.print(\u201cStainless Steel\u201d);
\/\/LCD I2C 20X4

\/\/ I2C counter for LEDs 
x++; \/\/ Increment x

\/\/From Left to Right
\/\/ First UNO
Wire.beginTransmission(1); \/\/ transmit to device #1
Wire.write(x); \/\/ sends x
Wire.endTransmission(); \/\/ stop transmitting

\/\/Second UNO
Wire.beginTransmission(2); \/\/ transmit to device #2
Wire.write(x); \/\/ sends x
Wire.endTransmission(); \/\/ stop transmitting

\/\/Mega in the Middle

\/\/Third UNO
Wire.beginTransmission(3); \/\/ transmit to device #3
Wire.write(x); \/\/ sends x
Wire.endTransmission(); \/\/ stop transmitting

\/\/Fourth UNO
Wire.beginTransmission(4); \/\/ transmit to device #4
Wire.write(x); \/\/ sends x
Wire.endTransmission(); \/\/ stop transmitting

if ( (x == 3) || (x == 6)) {
digitalWrite(LED, HIGH);
}
else {
digitalWrite(LED, LOW);
}

if (x == 7) x = 0; \/\/ `reset x once it gets 6
delay(1000);
\/\/ I2C counter for LEDs

\/*
\/\/ I2C Scanner Code
byte error, address;
int nDevices;

Serial.println(\u201cScanning\u2026\u201d);

nDevices = 0;
for(address = 1; address < 127; address++ )
{
\/\/ The i2c_scanner uses the return value of
\/\/ the Write.endTransmisstion to see if
\/\/ a device did acknowledge to the address.
Wire.beginTransmission(address);
error = Wire.endTransmission();

if (error == 0)
{
Serial.print(\u201cI2C device found at address 0x\u201d);
if (address<16)
Serial.print(\u201c0\u201d);
Serial.print(address,HEX);
Serial.println(\u201d !\u201d);

nDevices++;
}
else if (error==4)
{
Serial.print(\u201cUnknown error at address 0x\u201d);
if (address<16)
Serial.print(\u201c0\u201d);
Serial.println(address,HEX);
} 
}
if (nDevices == 0)
Serial.println(\u201cNo I2C devices found\\n\u201d);
else
Serial.println(\u201cdone\\n\u201d);

delay(5000); \/\/ wait 5 seconds for next scan
\/\/ I2C Scanner Code
*\/

}<\/pre>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"
The LCD 16\u00d72 I2C device also shared 0x27 I had to find the soldering iron and solder shut A0, A1, or A2. A0 = 1A1 = 2A2 = 4 I did A2.\u00a0 The address changed from 0x27 to 0x23.\u00a0 Scanning\u2026I2C device found at address 0x01 !I2C device found at address 0x02 !I2C device found at […]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":653,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"ocean_post_layout":"","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"0","ocean_second_sidebar":"0","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"custom","ocean_center_header_left_menu":"0","ocean_custom_header_template":"7100","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"0","ocean_menu_typo_font_family":"0","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"default","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"0","osh_disable_topbar_sticky":"default","osh_disable_header_sticky":"default","osh_sticky_header_style":"default","osh_sticky_header_effect":"","osh_custom_sticky_logo":0,"osh_custom_retina_sticky_logo":0,"osh_custom_sticky_logo_height":0,"osh_background_color":"","osh_links_color":"","osh_links_hover_color":"","osh_links_active_color":"","osh_links_bg_color":"","osh_links_hover_bg_color":"","osh_links_active_bg_color":"","osh_menu_social_links_color":"","osh_menu_social_hover_links_color":"","footnotes":""},"class_list":["post-662","page","type-page","status-publish","hentry","entry"],"yoast_head":"\nLCD 16\u00d72 I2C -<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mc.scsiraidguru.com\/index.php\/i2c\/lcd-16x2-i2c\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"LCD 16\u00d72 I2C -\" \/>\n<meta property=\"og:description\" content=\"The LCD 16\u00d72 I2C device also shared 0x27 I had to find the soldering iron and solder shut A0, A1, or A2. 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