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16x2 RGB backlit LCD + Backpack not working. Help!
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16x2 RGB backlit LCD + Backpack not working. Help!

by ronaldpizza on Mon Aug 03, 2020 9:56 pm

Hi there -

I recently purchased a 16x2 RGB backlit LCD + USB backpack (https://www.adafruit.com/product/784). I've completed the soldering and have been trying to connect via USB to both my Mac (OSX 10.13.6) and a Raspberry Pi running Raspian linux. In both cases, the power light on the device lights up and I am able to see the chip (AT90USB162) as a USB connection, but can't find anything under `/dev/` that corresponds to it. There is also no change to the display itself when I plug it in.

Shots of the soldering job + USB devices on OSX: https://imgur.com/a/YCPuoW3

On osx
Code: Select all | TOGGLE FULL SIZE
$ (imac) ls -l /dev/cu.*
crw-rw-rw-  1 root  wheel   21,   5 Aug  3 09:08 /dev/cu.Bluetooth-Incoming-Port
crw-rw-rw-  1 root  wheel   21,   3 Aug  3 09:08 /dev/cu.BoseAE2SoundLink-SPPDev-2
crw-rw-rw-  1 root  wheel   21,   7 Aug  3 09:08 /dev/cu.BoseAE2SoundLink-SPPDev-3
crw-rw-rw-  1 root  wheel   21,   1 Aug  3 09:08 /dev/cu.XXXXXXXX-SPPDev
crw-rw-rw-  1 root  wheel   21,   9 Aug  3 09:08 /dev/cu.XXXXXXXX-SPPDev-7


On my raspberry pi:
Code: Select all | TOGGLE FULL SIZE
$ (raspberrypi) sudo tail -f /var/log/syslog
Aug  4 01:21:57 raspberrypi kernel: [88435.650984] usb 1-1.4: new full-speed USB device number 7 using dwc_otg
Aug  4 01:21:57 raspberrypi kernel: [88435.766833] usb 1-1.4: New USB device found, idVendor=03eb, idProduct=2ffa
Aug  4 01:21:57 raspberrypi kernel: [88435.766855] usb 1-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Aug  4 01:21:57 raspberrypi kernel: [88435.766868] usb 1-1.4: Product: AT90USB162 DFU
Aug  4 01:21:57 raspberrypi kernel: [88435.766880] usb 1-1.4: Manufacturer: ATMEL
Aug  4 01:21:57 raspberrypi kernel: [88435.766892] usb 1-1.4: SerialNumber: 1.0.5


Any ideas on additional things to try / look at? Help would be greatly appreciated!

ronaldpizza
 
Posts: 2
Joined: Mon Aug 03, 2020 9:12 pm

Re: 16x2 RGB backlit LCD + Backpack not working. Help!

by ronaldpizza on Thu Aug 06, 2020 9:21 pm

Decided to try to see if I had any luck by hooking it up to an Arduino. Connected to an Arduino Uno via the wiring directions here (https://learn.adafruit.com/usb-plus-ser ... ttl-serial) and loaded the sample code. Code verifies and uploads successfully to the Arduino, and again -- power LED on the backpack lights up but the LCD itself shows nothing.

Any ideas? Concerned at this point that my unit might be defective. Any thoughts?

ronaldpizza
 
Posts: 2
Joined: Mon Aug 03, 2020 9:12 pm

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