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Forum Index : Microcontroller and PC projects : Small VGA monitor
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TassyJim Guru  Joined: 07/08/2011 Location: AustraliaPosts: 6098 |
While looking for a suitable small VGA monitor for a project I was tempted by this 7 inch one. 
Having the controller separate suits my purpose and I decided to go for the one with touch screen in the hope that I can get it working. I haven't found any details on the touch screen yet but I am forever hopeful. I will have a month or so to wait for the display to arrive so there is time for more research. Search EBay for: VGA+2AV+Remote control Reversing driver board+7inch AT070TN92 800×480 with touch Jim VK7JH MMedit  MMBasic Help |
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| jdh2550 Regular Member  Joined: 16/07/2012 Location: United StatesPosts: 62 |
Cool find Jim - thanks. The used Liliputt I got from ebay isn't working very well - and I like the "minimalist nature" of the one you found (as well as the price) UPDATE: If you just search on "HCR-N1" you'll also turn up some other options. This appears to be the name of the VGA input to TFT panel controller board. I think the TFT 60 pin connector for bare TFT panels is standard. If so you could source the panel and the controller separately for even more flexibility (plus possibly scavenge an LCD from an otherwise dead source?) |
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| jdh2550 Regular Member Joined: 16/07/2012 Location: United StatesPosts: 62 |
Check out this one: http://www.ebay.com/itm/VGA-AV-signal-Driver-Borad-7inch-800 -600-resolution-4-3-A070SN02-tft-lcd-display-/170877360368?p t=LH_DefaultDomain_0&hash=item27c91598f0 It's a 4:3 aspect ratio 7" display (rather than the "widescreen" format you posted above). 4:3 will match the aspect ratio of the VGA output so you won't get "stretched" characters. That link also has a list of other sizes down the left hand side of the page. |
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| TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6098 |
The 4:3 would certainly be better but I couldn't see any with touch screen in 4:3 I am guessing that the one I have on order has a 4 wire resistive touch panel. If that IS the case, I will have a number of options for interfacing. I can live with the widescreen thanks to the ability to do user defined fonts. Jim The Maximite iPad is coming! VK7JH MMedit  MMBasic Help |
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| Zougie Newbie  Joined: 04/10/2012 Location: AustraliaPosts: 18 |
I just bought two of these off Ebay for around $72 US each: 
I haven't received them as yet, but I also liked the 4:3 aspect ratio and 800x600 resolution. I'll let you know how good they are once I receive them....a couple of weeks. I too was was quite excited about the LCD modules, but was concerned with mounting strategies and the fact that they're weren't that much cheaper than a complete housed unit. Resolution of these modules looks to be decent though. Cheers, George |
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jman Guru Joined: 12/06/2011 Location: New ZealandPosts: 711 |
Hi I have one of these mounted in my Pathfinder 
http://www.ebay.com/itm/271050767296?ssPageName=STRK:MEWAX:I T&_trksid=p3984.m1438.l2649 I have it mounted into a double Din housing Works really well I can post some pics if anybody is interested John |
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| jdh2550 Regular Member Joined: 16/07/2012 Location: United StatesPosts: 62 |
I'd be interested - one of my projects is to rip out the cassette (yes, remember them?) radio and CD from my Prius and replace it with a home made infotainment device. I plan on hacking into the AVLan bus for control purposes. |
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| jman Guru Joined: 12/06/2011 Location: New ZealandPosts: 711 |
Hi Picture of the above monitor installed in my Pathfinder 
John |
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| jdh2550 Regular Member Joined: 16/07/2012 Location: United StatesPosts: 62 |
John - very nice install. Where did you get the bezel from? Is the USB on the front panel for a USB host connection? What software are you running? Thanks. |
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| jman Guru Joined: 12/06/2011 Location: New ZealandPosts: 711 |
 Thanks for the kind comments
I got the bezel from here bybyte The usb is host so I can plugin my iPhone or flash drive in The Operating system is Windows 7 with Centrafuse as the frontend Centrafuse makes for a real cool touch friendly system. Centrafuse It is also connected the the cars OBDII port so i can see live data from the ECU The PC itself is mounted under the back set and uses a DC-DC PSU Lots of hours of setup time
I have also interfaced the steering wheel controls via A/D to USB HID Regards John |
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| jdh2550 Regular Member Joined: 16/07/2012 Location: United StatesPosts: 62 |
Can you explain this part a bit more? I'm still gathering options for how to upgrade my Prius - I'm thinking of an Android tablet. But may do an LCD hooked to an SBC running Android (rPI? or Olimex A13?). A big part of the puzzle is the best way to interface to the car. If I go tablet then I'll use ADK (an SBC acting as host talking to the tablet) - this will work but it seems like "one processor too many". Thanks! |
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| TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6098 |
My new toy arrived today. 
The UBW32 is on the left. I really must get one of Mick's boards for the final installation! The display works well with the Maximite and I have a rough working touch program. Only two extra resistors were needed for a low parts count. I have to do a bit more fine tuning with the timing delays but I am pleased with a first attempt. See the XPT2046 or ADS7843 data sheets for a good description of how the resistive touch screen works. 
How the interrupt works: TouchIntEnable is set high Y2 is set low When the touch contact is made the low resistances of the X and Y resistors pulls TouchInt low. This triggers the interrupt. TouchIntEnable is then turned off to prevent it from interfering with the readings. X1 is driven High and X2 low and the mid point voltage read through Y1. The Y resistance has no effect on the reading due to the high input impedence. Y1 is then driven high and Y2 low and the Y positoin is read through X1. The delays are needed because of the high capacitance of the touchscreen and we need settling time. ***EDIT: In my real circuit, I have the Interrupt connected to the Y resistor and grounded X2. The theory is the same and it doesn't matter which way it's done. ' touch display demo
' by TassyJim ' 16 Nov 2012 ' see the XPT2046 or ADS7843 data sheets for a description ' of how the resistive touch screen works cls TouchY1=37 ' 4 analogue input pins for the resistors TouchY2=35 TouchX1=38 TouchX2=36 TouchIntEnable=34 ' any digital output pin TouchInt=28 ' digital interupt pin gosub _touchEnable _mainLoop: 'do stuff while waiting for a touch if t=1 then font 1, 4 print @(100, 40)"X ";Xhit;" ";@(100, 90)"Y ";Yhit;" " pause 100 gosub _touchEnable endif goto _mainLoop _touchEnable: setpin TouchY1, 1 setpin TouchY2, 1 setpin TouchX1, 1 setpin TouchX2, 8 Pin(TouchX2)=0 setpin TouchIntEnable, 8 pin(TouchIntEnable)=1 pause 100 setpin TouchInt, 7, _Touched t=0 return _Touched: pause 5 ' debounce time if pin(TouchInt)=0 then ' touch still there setpin TouchInt, 0 ' disable the interupt setpin TouchIntEnable,0 ' disable the interupt resistor setpin TouchX1, 8 ' Pin(TouchX1)=1 ' X1 is now high and X2 low pause 5 Xvolt=pin(TouchY1) ' read the X position using Y1 setpin TouchX1, 1 setpin TouchX2, 1 ' set the X as input setpin TouchY1, 8 ' and the Y as potential divider setpin TouchY2, 8 Pin(TouchY1)=1 Pin(TouchY2)=0 pause 5 Yvolt=pin(TouchX1) ' read the Y position using X1 Xhit=int(mm.hres*Xvolt/3.3) ' you can scale to any value here Yhit=int(mm.vres*Yvolt/3.3) if Xhit >470 or Yhit < 5 then 'reading is suspect Xhit=0 ' so set the results to zero Yhit=0 endif t=1 ' flag to indicate a touch decoded endif ireturn The next job is to get some working menus (and work out where in the caravan it is going to live) Jim VK7JH MMedit  MMBasic Help |
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