Memorial day is 05/25/2015 – Orders will ship out on May 26th. There will not be any deliveries or shipping on Monday. Any order placed after 11am ET on Friday May 22nd will not start to ship out until Tuesday May 26th.

Using 16 x 2 LCD with RGB LCD shield kit and R3 Uno
Moderators: adafruit_support_bill, adafruit

Using 16 x 2 LCD with RGB LCD shield kit and R3 Uno

by PierrePaul on Thu Dec 06, 2012 12:17 am

I am trying to use a blue and white 16 x 2 LCD (pid 181) with a RGB LCD shield kit (pid 715) mounted to a R3 Uno. The upper row lights (squares) but the lower row doesn't. Am I using the wrong shield for the blue & white LCD ? Should I be using another sketch instead of the one below ? I have attached a pic of my project. Thank you.

[Edit - moderator - please use the 'code' button when submitting code]

Code: Select all | TOGGLE FULL SIZE
/*********************

Example code for the Adafruit RGB Character LCD Shield and Library

This code displays text on the shield, and also reads the buttons on the keypad.
When a button is pressed, the backlight changes color.

**********************/

// include the library code:
#include <Wire.h>
#include <Adafruit_MCP23017.h>
#include <Adafruit_RGBLCDShield.h>

// The shield uses the I2C SCL and SDA pins. On classic Arduinos
// this is Analog 4 and 5 so you can't use those for analogRead() anymore
// However, you can connect other I2C sensors to the I2C bus and share
// the I2C bus.
Adafruit_RGBLCDShield lcd = Adafruit_RGBLCDShield();

// These #defines make it easy to set the backlight color
#define RED 0x1
#define YELLOW 0x3
#define GREEN 0x2
#define TEAL 0x6
#define BLUE 0x4
#define VIOLET 0x5
#define WHITE 0x7

void setup() {
  // Debugging output
  Serial.begin(9600);
  // set up the LCD's number of rows and columns:
  lcd.begin(16, 2);

  // Print a message to the LCD. We track how long it takes since
  // this library has been optimized a bit and we're proud of it :)
  int time = millis();
  lcd.print("Hello, world!");
  time = millis() - time;
  Serial.print("Took "); Serial.print(time); Serial.println(" ms");
  lcd.setBacklight(BLUE);
}

uint8_t i=0;
void loop() {
  // set the cursor to column 0, line 1
  // (note: line 1 is the second row, since counting begins with 0):
  lcd.setCursor(0, 1);
  // print the number of seconds since reset:
  lcd.print(millis()/1000);

  uint8_t buttons = lcd.readButtons();

  if (buttons) {
    lcd.clear();
    lcd.setCursor(0,0);
    if (buttons & BUTTON_UP) {
      lcd.print("UP ");
      lcd.setBacklight(RED);
    }
    if (buttons & BUTTON_DOWN) {
      lcd.print("DOWN ");
      lcd.setBacklight(YELLOW);
    }
    if (buttons & BUTTON_LEFT) {
      lcd.print("LEFT ");
      lcd.setBacklight(GREEN);
    }
    if (buttons & BUTTON_RIGHT) {
      lcd.print("RIGHT ");
      lcd.setBacklight(TEAL);
    }
    if (buttons & BUTTON_SELECT) {
      lcd.print("SELECT ");
      lcd.setBacklight(VIOLET);
    }
  }
}
Attachments
P1020109.JPG
Shield with R3, view 1
P1020109.JPG (116.77 KiB) Viewed 640 times
P1020106.JPG
Shield with R3, view 2
P1020106.JPG (90.58 KiB) Viewed 640 times
PierrePaul
 
Posts: 1
Joined: Wed Dec 05, 2012 11:22 pm

Re: Using 16 x 2 LCD with RGB LCD shield kit and R3 Uno

by adafruit_support_bill on Thu Dec 06, 2012 7:15 am

The shield works with all of our 16x2 LCDs. Post clear photos of the front & back of the shield & we'll check the assembly. If you can size them a bit larger that what you have posted here, we can see the soldering a little better.

adafruit_support_bill
 
Posts: 37497
Joined: Sat Feb 07, 2009 10:11 am

Re: Using 16 x 2 LCD with RGB LCD shield kit and R3 Uno

by Hackoholic on Fri Dec 28, 2012 7:51 am

Not sure if this was resolved privately or not but I saw something very similar to what was described. After building the shield and plugging it in, I adjusted the contrast pot almost all the way up and saw just the top row of cells and no backlight. Once I downloaded the library, properly renamed it and loaded up the "Hello World" sketch everything worked great and both rows displayed properly with a bright backlight. Before I loaded the sketch I was thinking something was wrong with the LCD but this appears to be normal behavior until a proper sketch is loaded to activate the backlight and display text on both rows.
Hackoholic
 
Posts: 7
Joined: Fri Mar 16, 2012 12:50 pm