Hi all. I’m starting my first real Spark project and would like to add an LCD for feedback. The LCD I’m using came with an Arduino kit I bought and the backpack is a Serial IIC I2C Adapter Serial Interface Board Module For Arduino, Model: GY-IIC-LCD. I’ve read the existing I2C/LCD posts (very infor…

@Bruster , you now have 3 topics regarding this display. Can I ask you to kindly keep it to one so we don’t have to repeat our answers :stuck_out_tongue: I have the impression that something is not setup correctly with either the hardware or the code. On THIS topic, can you post the code your are …

[image] Hi all, I just got my new Spark and I’m trying to get it to work with my 1602 LCD with backpack. Unfortunately I can’t even get to 1st base (no backlight). The LCD came with the Arduino kit I bought and the backpack is a Serial IIC I2C Adapter Serial Interface Board Module For Arduino 1602…

@Bruster , first things first. You may need pull-up resistors (4.7K ohms) on the I2C lines if there are none on the backpack. Seconds, which library are you using? Third, I believe the backlight is turned on with software so that may explain that. :smile:

@peekay123 , I’m using code from a project called “lcd-buses-±weather-report” and trimmed out everything but the backlight command for now. I’ll try the pull-ups and see if that helps. Thanks.

Dang. Didn’t work. I added the 4.7k pull-ups from the +5v rail to D0 and D1. Is there a simple I2C LCD test sketch floating around? Something akin to “Hello Sparky!”? Bruster[image]

Hi @Bruster I can see that you don’t have any external pull-up resistors on the i2c lines. On Spark these always need a pull-up resistor (4.7k ohm is ideal) to 3.3V. Have you tried adding pull-up resistors on both lines?

Hi @bko . I didn’t at first but I read others discussing the pull-ups and added them but it didn’t make any difference. I put the 4.7k resistors from the +5 rail to D1 and D1. The code loads into the Spark, the main LED breaths cyan but the display remains blank. Thanks. D0 -> SDA D1 -> SCL Vin ->…

@Bruster , i have moved all the posts into this topic where the title better reflects what you need :smiley:

@Bruster : I have made a “tutorial” for i2c LCD. Maybe this could help you: [image] LCD i2c (Lib+Info+CustomCharacters) Hitchhikers Guide to run a i2c 16x2 LiquidCrystalDisplay . First, for all, and forever: All starships “Heart of Gold” goes to @sej7278: He helped me out and without…

I2C/LCD Hello World needed

Hardware

clyde June 12, 2014, 5:56am 11

@Bruster:
I have made a “tutorial” for i2c LCD.
Maybe this could help you:

Topic		Replies	Views
LCD i2c (Lib+Info+CustomCharacters) Tutorials	18	14373	July 4, 2015
I2C LCD display getting corrupted Troubleshooting	6	713	October 28, 2018
Using an I2C / SPI LCD on the Spark Core Hardware	124	21022	March 23, 2016
I2C enabled 16x2 LCD display	4	2871	June 15, 2014
Problem with Grove RGB LCD Getting Started	42	20397	March 24, 2020

I2C/LCD Hello World needed

Related topics