Thursday 1 May 2014

Turn old laptop monitor/screen lcd to make a external monitor

Source: RedFathom ( https://www.youtube.com/watch?v=r_lm1kRa1Fs&list=PL5xraSSdWblzadOLVWeN4_n3uh4AEigfe )



His sources:

Teensyduino microcontroller
http://www.pjrc.com/store/teensy.html

LVDS controller
http://www.ebay.com/sch/m.html?_odkw=&_ssn=goldpart&_nkw=gm5621

Bongofish
http://wiki.bongofish.co.uk/doku.php?id=bongofish:penenabled

Waxbee code
http://code.google.com/p/waxbee/

Teensyduino is used for serial-usb conversion of the tablet. (RedFathom)

The tablet uses a teensyduino 2.0 loaded with the waxbee script. it's just wired between D1&D2 on the teensy and 9-Rxd&10-Txd on the tablet. of course gnd-gnd vcc-vcc. i'll have to post my configuration file probably. you can find everything you need on the bongofish website it's where i found most of the info to do this. you'll probably have to take the tape off the cable since the colors vary. (RedFathom)


Model : HP TC4400 tablet

May 1, 2014:
Ordered LVDS controller (gm5621) off ebay.
Ordered teensy (2.0 without pin) off www.pjrc.com/store/teensy.html

Studied bongofish website, corresponding WACOM model# :  SU-025-C02
there are 2 types for the pins, 10 or 14 pins.

For 14 pins, identify gnd(P1 or P2), vcc(P13), usb data+(P4), usb data -(P3).
For 10 pins, identify gnd(P6), vcc(P1), rxd tab->host @19200baud (P2), txd tab<-host (P3)
**txd description is different in bongofish website, but i believe this is the correct way.


TBC...

2 comments:

  1. Hi,

    How did you do with this project? I have got an HP TX2500 and am planning to do the same thing with its penabled monitor.
    have you got any other sourcess you had discovered since writnig this blog?

    Thanks,

    ReplyDelete
  2. This project went down since the cost of project exceeded getting a small lcd made specifically for raspberry pi.

    Try one of these full kits which will save you time in looking for cables and correct power supply.
    http://www.ebay.ca/itm/M-NT68676-2A-HDMI-DVI-VGA-Audio-LCD-Controller-Board-DIY-Kit-Power-Adapter-/121059321784?hash=item1c2fb2a7b8
    You can PM the seller and specifically ask about the compatibility.
    Good luck!

    ReplyDelete