2004 20x4 I2C Serial LCD Module (HCMODU0010)

LCD, TFT, OLED, LED modules
bobkoytc
Posts: 3
Joined: Sun Apr 18, 2021 12:53 pm

Re: 2004 20x4 I2C Serial LCD Module (HCMODU0010)

Post by bobkoytc » Sun Apr 18, 2021 3:49 pm

I should have persevered a bit longer before making my previous post, above.
I have the backlight working now.
I had to short together two two pins on the rear of the module.

andrew
Site Admin
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Joined: Sun Aug 05, 2012 4:15 pm

Re: 2004 20x4 I2C Serial LCD Module (HCMODU0010)

Post by andrew » Mon Apr 19, 2021 8:27 am

Display works nicely, once I'd figured out the I2C address.
The instructions in the first post say "If there a 3 sets of pads labelled A0, A1, & A2 then the default address will be 0x3F. If there are no pads the default address will be 0x27."
My board has no pads but the address is 0x3F.
Sorry about that. It looks like this has changed in our latest stock. I've now updated the first post to reflect this.

I should have persevered a bit longer before making my previous post, above.
I have the backlight working now.
I had to short together two two pins on the rear of the module.
Yes this header is used to break the power to the backlight and git the option to control it from an external source. There should have been a jumper fitted to it. Sometimes this jumper can work loose in transit. You may want to check the packaging but also it can sometimes get lodged under the daughter board.
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bobkoytc
Posts: 3
Joined: Sun Apr 18, 2021 12:53 pm

Re: 2004 20x4 I2C Serial LCD Module (HCMODU0010)

Post by bobkoytc » Tue Apr 20, 2021 11:42 am

I've now checked the packaging and yes there's a little jumper in there!
Must have come off in transit.
The two pins are marked LED so I thought you must be able to connect some sort of LED to it. I've found no instructions to say what it was for.
Thanks for you help. All working nicely now.

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