0

16x2 RBG i2c Shield not working
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

16x2 RBG i2c Shield not working

by dvbellamy on Tue Nov 14, 2017 2:39 pm

Hi, I assembled my i2c 16x2 RGB LCD shield last night. I have some experience of soldering, but I'm not 100% confident yet.
I put it all together and plugged it into my Arduino Uno (R3 if that makes a difference), then I downloaded the example code from here (Adafruit RGB LCD Shield Library), and uploaded the "Hello World" example to the board.
Unfortunately it doesn't work. If I turn the contrast all the way to the left, I get a few white boxes in the top row of the LCD, but no text.
Help! What did I do wrong?
I've attached some photos below...
Thanks
20171114_182138.jpg
20171114_182138.jpg (99.25 KiB) Viewed 147 times

20171114_181729.jpg
Soldering...
20171114_181729.jpg (89.71 KiB) Viewed 147 times

20171114_181745.jpg
Soldering...
20171114_181745.jpg (90.98 KiB) Viewed 147 times

dvbellamy
 
Posts: 6
Joined: Tue Nov 14, 2017 2:22 pm

Re: 16x2 RBG i2c Shield not working

by dvbellamy on Thu Nov 16, 2017 3:16 pm

Bump... anyone?

dvbellamy
 
Posts: 6
Joined: Tue Nov 14, 2017 2:22 pm

Re: 16x2 RBG i2c Shield not working

by adafruit_support_bill on Thu Nov 16, 2017 3:28 pm

Please post a photo showing the back of the shield. Also, try running the i2c scanner and post the results here.

https://playground.arduino.cc/Main/I2cScanner

adafruit_support_bill
 
Posts: 62905
Joined: Sat Feb 07, 2009 10:11 am

Re: 16x2 RBG i2c Shield not working

by dvbellamy on Thu Nov 16, 2017 3:41 pm

Thanks, yeah I took one, but could only upload 3 photos. I should have posted again.
I'm going to have to Google the i2c scanner to find out what to do so bear with me on that.
Thanks
Edited: Now I see you provided a link, thank you. Give me a while, might be off out shortly.
20171114_181757.jpg
Back of shield
20171114_181757.jpg (101.49 KiB) Viewed 111 times

dvbellamy
 
Posts: 6
Joined: Tue Nov 14, 2017 2:22 pm

Re: 16x2 RBG i2c Shield not working

by franklin97355 on Fri Nov 17, 2017 4:12 am

It looks like some of your solder connections are not well made and the solder hasn't flowed between the pin and the pad. Try reflowing the connections and see if that helps.

franklin97355
 
Posts: 16849
Joined: Mon Apr 21, 2008 2:33 pm
Location: Lacomb, OR.

Re: 16x2 RBG i2c Shield not working

by dvbellamy on Sat Nov 18, 2017 7:35 am

Thanks Franklin. I've just reflowed everything, and checked it over and over again. I've done some continuity tests on the buttons and resistors (I don't know how to check the chip), and it still doesn't work.
I tried the i2c scanner and it keeps repeating "No I2C devices found".
I'm about ready to dump it and chalk it up to bad experience.
Last edited by dvbellamy on Sat Nov 18, 2017 7:38 am, edited 1 time in total.

dvbellamy
 
Posts: 6
Joined: Tue Nov 14, 2017 2:22 pm

Re: 16x2 RBG i2c Shield not working

by adafruit_support_bill on Sat Nov 18, 2017 7:38 am

There are only a few critical pins necessary for operation, and the solder on those looks OK.

Did you run the i2c scanner? https://playground.arduino.cc/Main/I2cScanner
What were the results.

adafruit_support_bill
 
Posts: 62905
Joined: Sat Feb 07, 2009 10:11 am

Re: 16x2 RBG i2c Shield not working

by dvbellamy on Sat Nov 18, 2017 7:40 am

Sorry I was editing my post above as you posted.
"No I2C devices found" repeated over and over again.

dvbellamy
 
Posts: 6
Joined: Tue Nov 14, 2017 2:22 pm

Re: 16x2 RBG i2c Shield not working

by adafruit_support_bill on Sat Nov 18, 2017 12:19 pm

Sounds like the GPIO expander chip is not responding. Please contact support@adafruit.com with a link to this thread and we can send a replacement kit.

adafruit_support_bill
 
Posts: 62905
Joined: Sat Feb 07, 2009 10:11 am

Re: 16x2 RBG i2c Shield not working

by dvbellamy on Sat Nov 18, 2017 3:19 pm

Wow. That's what I call fantastic customer support.
Thank you.

dvbellamy
 
Posts: 6
Joined: Tue Nov 14, 2017 2:22 pm

Please be positive and constructive with your questions and comments.