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bantri
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« Reply #1 on: March 24, 2008, 06:45:15 PM » |
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bantri
Intrigued
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« Reply #2 on: March 24, 2008, 06:47:52 PM » |
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ultrajosh
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« Reply #3 on: March 24, 2008, 06:51:33 PM » |
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Those hi-rez bar-graphs look really sweet!
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"Well you touch it and it makes sounds."
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bantri
Intrigued
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« Reply #4 on: March 24, 2008, 11:08:56 PM » |
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ohhhh yessss.... my eyes shine when looking for those high res serial controled led bargraphs... i surfed a lot to find those... and that 40 led one is selling for 5.49 at ebay which seems a reasonable price.  |
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bantri
Intrigued
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« Reply #5 on: March 24, 2008, 11:16:12 PM » |
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there is also the fact that at primelet they sell the led arrays already grid (rolxcol) hardwired which can help minimize tracks on the pcb... see the grid encoding presenting only a few pins outside the module:  |
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bantri
Intrigued
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« Reply #6 on: March 24, 2008, 11:30:29 PM » |
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As for an smt pcb solution there ARE smd leds that can be soldered side by side. they even come already in 10 toghether packs, touching close to each other and ready to be aplied in an smt pcb. (although the soldering process may require solder paste reflowing assembly) like these ones with a ceramic base(see the datasheet for the 10pack packaging) http://optoelectronics.perkinelmer.com/catalog/Product.aspx?ProductID=CR60B |
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bantri
Intrigued
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« Reply #7 on: March 25, 2008, 12:55:58 AM » |
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ultrajosh
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« Reply #8 on: March 25, 2008, 07:29:02 AM » |
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This is some great research! The 40-segment does seem like a good deal. The microcontroller circuit to control the LEDs is probably quie simple, but you still have to add touch to it. A good find and good to look at how people put these together.
I think making something like this brings us into patent-land, though.
Were you able to find just the hi-rez LED bar without the supporting electronics? Any idea of the pin out configuration?
This would be a cool way to make a 1 or 2-strip version of the stribe, but it couldn't be kitted if it requires surface mount.
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"Well you touch it and it makes sounds."
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ultrajosh
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« Reply #9 on: March 25, 2008, 08:02:55 AM » |
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Another issue to keep in mind is power consumption. I was just looking at the Primeled part (sweeet! especially the 137mm one) but then noticed this:
"The DDV-53 module operates two bargraphs with a single +5V supply at approximately 300 mA; the DDV-106 requires 600 mA. Current consumption is for a set of DDV- and ALI- modules, including bargraph drive current at normal brightness."
One two-bar 137mm unit already takes you over USB spec... maybe you could turn down the brightness (like I did) to reduce current draw.
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"Well you touch it and it makes sounds."
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bantri
Intrigued
Posts: 39
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« Reply #10 on: March 25, 2008, 12:45:04 PM » |
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for power consumption this may be an option: WD-C2401P LCD Panel Driver http://www.serialwombat.com/channel_mode_lcd111.htm it has a high 24 chars x 5 pixels resolution, very low consuption, serial interface and can present text messages. |
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bantri
Intrigued
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« Reply #11 on: March 25, 2008, 01:00:18 PM » |
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it´s also selling here at 1.85 (very atractive cost, already assembled, serial interface) http://www.allelectronics.com/cgi-bin/category.cgi?item=LCD-111&type=store&review=all besides having a 120 line resolution, it can present graphical cursors like circles, squares, arrows, musical note letters, drum patterns, text messages, dithered gray patterns (for simulating higher resolution) having a 24x (5x7) pixel lcd grid can be an atractive option against 64 led dots. visually is less atractive but it has the versatility mentioned above... |
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bantri
Intrigued
Posts: 39
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« Reply #13 on: March 25, 2008, 01:22:09 PM » |
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this other one could be an extreme option presenting 40x2 chars of 5x7 pixels in terms of a bargraph it can present 200 lines stereo and have no problems of current consumption even with all pixels activated, and with an easy serial interface, custom characters, etc... at 5.50 it can present much more information than a led row still having the same cost of a led display. http://www.allelectronics.com/cgi-bin/item/LCD-105/365/40_CHARACTER_X_2_LINE_LCD_.html |
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