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Re: Serial I2C LCD 1602 Module (HCARDU0023)

Posted: Thu Jan 28, 2016 10:38 am
by colubridae
andrew wrote:Yes, the digital signals from your Arduino to the LCD need to have a ground reference. Similarly your power supply for the LCD needs a ground return path. As both the Arduino and the power supply will then be both grounded to your LCD, their grounds are effectively connected together.

Many thanks Andrew. :)

Re: Serial I2C LCD 1602 Module (HCARDU0023)

Posted: Fri Feb 05, 2016 11:42 pm
by Jon5
Hi,

I'm new to the world of Arduno and treated myself to an Uno+ and I2C after Xmas for a bit of a project.

I've had a problem trying to get the I2C to display text and up until now it would only power on, illuminate but no text displayed. I only just realised there's contrast adjustment on the back of the LCD and after turning it have managed to get text to be barely visible but nothing better. I've adjusted through the full range from one direction to the other but it's only visible at single narrow point.

Is there anything I can do to make the display contrast greater?


Thanks,
Jon

** Update
Disregard that, I'm an idiot and connected the VCC pin on the LCD to the 3.3V 3V3 pin... needless to say connecting it to the correct 5V pin resolves the above issue. :oops:

Re: Serial I2C LCD 1602 Module (HCARDU0023)

Posted: Sat Dec 16, 2017 8:40 am
by fusepop
Brilliant, finally got it working, thanks to this post.

Many thanks guys.

Al. :D

Re: Serial I2C LCD 1602 Module (HCARDU0023)

Posted: Sat May 12, 2018 2:16 pm
by hmjswt
Hallo,

I am working with the smart LCD module in AT mode.
When I wanted to print a variable it did not respond.
After some trial end error I did find the following solution:

Serial.println("AT+RC=0,2"); // Set cursor to first line position 3
Serial.println("AT+PR=Temperature");
Serial.println("AT+RC=1,2"); // Set cursor to second line position 3
Serial.print("AT+PR="); // Send AT print command
Serial.println( tempC, 1 ); // Print temperatue with one decimal
Serial.println("AT+PR= Celsius");

Is this the correct way to do it?

Thank you,
Henk Siewert

Re: Serial I2C LCD 1602 Module (HCARDU0023)

Posted: Mon May 14, 2018 8:39 am
by andrew
Yes, that's the correct.

Btw this is the product thread for the standard serial LCD, you can find the correct one for your LCD here:

http://forum.hobbycomponents.com/viewto ... =75&t=2203

Re: Serial I2C LCD 1602 Module (HCARDU0023)

Posted: Fri Sep 11, 2020 4:49 pm
by mike.bayliffe
I have a major difficulty getting access to the "Serial I2C LCD 1602 Module (HCARDU0023)" library download HCARDU0023_LiquidCrystal_I2C.zip

I've tried the link in the forum's posts all to no avail as I get an error from the broswer (Edge) that it's unable to open the link and download the information requested. I'm logged in to the forum and am somewhat fed up with all this hassle. Can someone please give a link that works....???

Mike Bayliffe

Re: Serial I2C LCD 1602 Module (HCARDU0023)

Posted: Sat Sep 12, 2020 8:36 am
by andrew
I've just checked the link and it seems to be working fine in both Chrome and Microsoft Edge so I have no idea why it's not working for you. I suspect if I just link to it from a different location you'll still have the same problem so I'm going to attempt to email it to you directly.

Edit: I notice you have two email address on file so I've just sent it to the one you used to register this account with. Please let me know if you have any further issues.

Re: Serial I2C LCD 1602 Module (HCARDU0023)

Posted: Sun Nov 07, 2021 6:19 pm
by steve001
Hi,

Is there a circuit diagram available please ?

Steve

Re: Serial I2C LCD 1602 Module (HCARDU0023)

Posted: Mon Nov 08, 2021 9:40 am
by andrew
A schematic for the backpack module has now been added to the first post of this thread

Re: Serial I2C LCD 1602 Module (HCARDU0023)

Posted: Sun Nov 14, 2021 8:36 am
by steve001
Thank you

Is J3 on the schematic the pin header with the link attached ?

Can you also advise a part number for the 4 core lead that is shown in the photo's ?

Regards

Steve