Can this be used??? - Page 1
Forum section: electronics / beginners

author: skillz21
author_rank: Frequent Contributor
timestamp: February 04, 2017, 10:17:18 am
content: I had an old Epson printer. It stopped working so I decided to open it up. inside I found some cool things. One was a colour LCD display and another was a WLU3072 2.4Ghz Wireless LAN mini USB Module. With the Wi-Fi module, it has a stupid 4 pin connector (5 pin actually but it only uses 4). I tried a few combinations to power it but my computer never recognises the device. Does anyone know the pinout for it? With the display, I was wondering if I could get it to work with say.... an arduino or something? I tried to find a datasheet for it but I couldn't find one. I have some pictures attached.Thx

author: RGB255_0_0
author_rank: Frequent Contributor
timestamp: February 04, 2017, 11:12:35 am
content: Quote from: skillz21 on February 04, 2017, 10:17:18 amNo you don't.And the "few combinations" - at what voltages?

author: danadak
author_rank: Super Contributor
timestamp: February 04, 2017, 12:36:09 pm
content: If you just wired arbitrary voltages to the module good chance youtoasted it. Unless you set power supply up with a low value of currentlimiting.Regards, Dana.

author: skillz21
author_rank: Frequent Contributor
timestamp: February 04, 2017, 01:09:25 pm
content: Quote from: danadak on February 04, 2017, 12:36:09 pmoh...

author: skillz21
author_rank: Frequent Contributor
timestamp: February 04, 2017, 01:12:07 pm
content: Quote from: RGB255_0_0 on February 04, 2017, 11:12:35 am5v

author: RGB255_0_0
author_rank: Frequent Contributor
timestamp: February 04, 2017, 01:23:55 pm
content: Can you post the pictures. I hope it's not 3.3V and you put 5V through it.

author: skillz21
author_rank: Frequent Contributor
timestamp: February 04, 2017, 01:25:22 pm
content: Quote from: RGB255_0_0 on February 04, 2017, 01:23:55 pmfor some reason the pics dont work, i'll try again. it says mini usb, so im guessing its 5v

author: Isad
author_rank: Frequent Contributor
timestamp: February 04, 2017, 01:57:25 pm
content: It says it USB 2.0 so you probably havent fried anythingif you have conected power and ground correctlyIf anything the board was fried

author: skillz21
author_rank: Frequent Contributor
timestamp: February 05, 2017, 01:27:08 am
content: here's the pics

author: skillz21
author_rank: Frequent Contributor
timestamp: February 05, 2017, 03:38:23 am
content: also, what about the display?

author: ebastler
author_rank: Super Contributor
timestamp: February 05, 2017, 07:43:28 am
content: For the WLAN module, it's bound to have +5V and GND plus two data lines (as it claims to be a USB module, although with a non-standard connector). If you look at the connections on the bottom side of the PCB, and/or measure what the four pins are connected to, you should be able to identify GND and +5V quite easily. Then, I think it's safe to simply try the two possible pairings of the data lines, and see whether you can get a PC to recognize this as a USB device.For the display, it would be good to see the bottom side of the PCB, where the driver chip will be. Can you unclip the PCB from the white plastic frame and flip it over, then take another photo? (Careful with the flex cables!)

author: Monkeh
author_rank: Super Contributor
timestamp: February 05, 2017, 07:45:54 am
content: Quote from: ebastler on February 05, 2017, 07:43:28 amThe bluetooth module in my laptop is USB - but it surely does not take 5V. The only reason USB uses 5V is because of cable length - not an issue inside a device, 5V isn't used.

author: ebastler
author_rank: Super Contributor
timestamp: February 05, 2017, 08:15:08 am
content: Quote from: Monkeh on February 05, 2017, 07:45:54 amThanks Monkeh, good point. There is a "low-voltage inter-chip" supplement to the USB standard that I was not aware of. It defines five different "voltage classes" between 1.0V and 3.0V. So, the OP needs to look at the actual chips used and check their datasheets (and hope the WLAN adapter is not dead yet...).http://read.pudn.com/downloads74/doc/project/264538/usb_20/Inter-Chip%20USB%20Supplement%20to%20the%20USB%202.0%20Specification_1.0.pdfEDIT: fixed the link