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| Parallax Forums > Public Forums > Propeller Chip > New 4.3" touchscreen LCD for Propeller: Breakout Boards Shipping! | Forum Quick Jump
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Rayman
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Date Joined Jul 2007
Total Posts : 2408
| Posted 9/14/2009 11:43 AM (GMT -8) |   | | | |
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JRetSapDoog
Registered Member
Date Joined Jul 2009
Total Posts : 62
| Posted 9/14/2009 9:14 PM (GMT -8) | | I had a harmless/superfluous connection dot in the LCD drawing, which I've now edited out.
When you say that the board draws 420mA with full backlight, at what voltage is the board (3.3V or 5V)? I'm curious about total power consumption.
For the actual LCD driver, how many cogs are involved, one or two? I'm also curious about your final frame rate and the degree of perceptible flicker. | | Back to Top | | |
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Rayman
Registered Member
Date Joined Jul 2007
Total Posts : 2408
| Posted 9/15/2009 5:27 AM (GMT -8) | | | 420 mA is total current from a 9V exteral supply...
Just one cog, just like the basic VGA driver from which it was derived...
I've played around with varying the dot clock all the way from 0.5 to 15 MHz...
I have to see if there's any power dependence...
Display is rock solid with no flicker at any frequency in this range....
I think I'll pick 8 or 10 MHz for the driving frequency.
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JRetSapDoog
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Date Joined Jul 2009
Total Posts : 62
| Posted 9/15/2009 8:29 AM (GMT -8) | | Sounds wonderful! You're the ray, eh...I mean the man. Okay, maybe both. Yeah, probably not the first time you've read that with your 2100+ posts.
In following your work, it seems like you take an open-minded and optimistic approach to your design experiments. I should learn from that. I would have thought that one would have had to have precisely calculated all that timing stuff--front porch, back porch, data hold times and what not--before conducting a test (and perhaps you did or estimated things), but you seem to be able to work magic by quickly varying things in code and just trying a range of parameters. Hmm...considering how flexible that display appears to be timing-wise, now I'm kind of wondering just a little bit if it's a standard "raw" RGB display. It seems like one of the pics showed it attached to its own PCB. Guess I should dig up one of your related threads for the display data and look into that, but I'm still assuming that it's a fairly standard display in terms of operation.
Anyway, let me go take a patience pill and stop distracting you from your work and progress (but please do keep us in the peanut gallery posted, as you've been doing).Post Edited (JRetSapDoog) : 9/15/2009 4:42:45 PM GMT | | Back to Top | | |
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max72
Registered Member
Date Joined Nov 2008
Total Posts : 64
| Posted 9/23/2009 10:54 PM (GMT -8) | | I'm interested in purchasing some displays (and maybe also connectors, if you will decide to sell a bundle).
While the displays are perfect for one shot projects, projects that might require more units in the future could require an alternative display.
Are there around similar displays (with the possibility to adapt the modified VGA code)? Probably I'm doing something wrong in the search, but I cannot find anything similar..
Massimo | | Back to Top | | |
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neoteric
Registered Member
Date Joined Dec 2005
Total Posts : 136
| Posted 9/24/2009 7:25 AM (GMT -8) | | | I would like to purchase two, when they are ready! | | Back to Top | | |
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Rayman
Registered Member
Date Joined Jul 2007
Total Posts : 2408
| Posted 9/24/2009 8:06 AM (GMT -8) | | | | |
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Rayman
Registered Member
Date Joined Jul 2007
Total Posts : 2408
| Posted 9/25/2009 8:55 AM (GMT -8) | | | | |
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max72
Registered Member
Date Joined Nov 2008
Total Posts : 64
| Posted 9/26/2009 1:45 AM (GMT -8) | | I already knew the price you proposed for the units is extremely good, but cross checking it with the PSP screens on sparkfun make it even more impressive.
Massimo | | Back to Top | | |
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Rayman
Registered Member
Date Joined Jul 2007
Total Posts : 2408
| Posted 9/26/2009 2:54 AM (GMT -8) | | | | |
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Rayman
Registered Member
Date Joined Jul 2007
Total Posts : 2408
| Posted 10/8/2009 2:20 PM (GMT -8) | | | | |
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microcontrolled
My head is SPINing.
Date Joined Oct 2008
Total Posts : 867
| Posted 10/8/2009 2:39 PM (GMT -8) | | No.  I will get the breakout board when it comes out and 1 or 2 displays.
Computers are microcontrolled.
Robots are microcontrolled.
I am microcontrolled.
But you can call me micro.
Want to experiment with the SX or just put together a cool project?
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JRetSapDoog
Registered Member
Date Joined Jul 2009
Total Posts : 62
| Posted 10/10/2009 10:52 PM (GMT -8) | | Congratulations! That's exciting progress.
I think that the VGA and TV-Out plans are good features for a Prop-based board, even with the integrated LCD...because that would allow one to more directly play/experiment with the VGA/TV objects (if cutting one's teeth on the Propeller using such a board), in addition to the obvious expanded output options. I built a small connector board and cable to connect to the PSM's 10-pin header area to add such functionality. However, I get a bit of ghosting when attached to one monitor and more when attached to another. My connection cable between the two boards is apparently too long and I perhaps unwisely twisted the wires as well (the cable was fashioned of individual wires, not ribbon cable), the length and twisting of the cable likely contributing to some unwanted noise due to extra capacitance and so on (anyone know with more certainty?). Anyway, having the resistors and connectors integrated onto the same board with the Prop would probably eliminate noise, as well as add connectivity options and convenience.
Regarding the PSM's accelerometer, I haven't actually played with it. I suppose it could be interesting for a game of some sort, but I'm not really seeking a board to act like an iPhone. And I kind of doubt that most uses would be using such a board in a robotic application, wherein such capability might have a more practical use. However, I can see how it is kind of cool, and just because I haven't used it, doesn't mean that it doesn't have its applications (maybe I'll yet discover one of interest to me). I'm just not sure about the cost of the chip (maybe five bucks or more), and I forget the particulars of the connectivity in terms of Prop pins. I guess if you need the I2C for other things (such as ADC or whatever), then there's no loss. Incidentally, in my case, I don't actually have much need to control the back light intensity (on and off would be enough for me, or just always on to save a pin). Anyway, accelerometer or not, I'd be interested in seeing some kind of audio amplifier capable of driving a speaker with around a watt of power being added to the new board (combined with or in addition to the headphone amplifier), but maybe that's just me. Of course I realize the board can't do everything, and, at least in the case of the PSM, you added pads/through-holes in the unused area for adding functionality.
Speaking of I2C, is that a real time clock (RTC) you're considering for the revision beyond the current prototype? If so, that's sounds useful/interesting. Hmm...wonder if battery backup would be provided for it (and how large such a battery might be in terms of board real estate).
Oh, and when you speak of adding an LCD header to allow the board to double as a breakout board, pardon my ignorance, but does that mean one would connect an external CPU/LCD driver to the 4.3" LCD, bypassing the rest of the board, or would that mean that the board could be connected to an external raw LCD panel, by passing the integrated 4.3" panel? I guess it's the former possibility, since the board already has a decent LCD, touch-screen, no less, but just checking.
Oh, and while I'm at it, in what sense did you mean "USB keyboard/mouse input (PS2 mode only)"? For anyone that's been following this forum's threads, obvioulsy that wouldn't involve the USB data protocol (not without an additional chip, anyway). So does that refer to, for example, attachment of those keyboards that have USB physical connectors and signaling capability but that can automatically sense PS/2 connectivity on the PC-end (after passing through a "dumb" adapter)? That is, do you envision USB connectors on such a board as opposed to the PS/2 connectors that we've seen on some of the other boards? I guess that could help us avoid using ugly adapters. I'm not sure how such mice/keyboards are advertised in terms of the automatic sensing and switching capability, something involving PS/2 undoubtedly, but apparently not all of them have it if I recall correctly.
Anyway, congratulations again, and thanks for the update on your terrific progress.
--Jim | | Back to Top | | |
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Forrest
Registered Member
Date Joined Aug 2004
Total Posts : 1222
| Posted 10/11/2009 3:27 AM (GMT -8) | | Looks great.
My opinion - you should put the RTC and Accelerometer on a seperate daughterboard to keep the base system cost lower.
Gadget Gangster is selling your original PSM for $99. What do you expect this version to sell for?
Forrest | | Back to Top | | |
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