Propeller Platform board for the $10 3.5" touchscreens (driver works!)

Rayman

We·just finished the layout for a Prop Platform style board to drive our $10 touchscreens!

Here are·the main features:

Prop (6 unused pins)
3.5" LCD 60-pin connector
Full size SD card socket
amplified stereo heaphone jack
mounting holes for 4x AAA battery pack (on bottom)

Hope to have a prototype ready for UPEC...

Here's what the layout looks like (It was very difficult with just 2 layers!):

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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm

My Prop Products:· http://www.rayslogic.com/Propeller/Products/Products.htm

Post Edited (Rayman) : 5/9/2010 9:28:58 AM GMT

Bill Henning

I like it!

Rayman said...
We just finished the layout for a Prop Platform style board to drive our $10 touchscreens!


Here are the main features:



Prop (6 unused pins)

3.5" LCD 60-pin connector

Full size SD card socket

amplified stereo heaphone jack

mounting holes for 4x AAA battery pack (on bottom)



Hope to have a prototype ready for UPEC...



Here's what the layout looks like (It was very difficult with just 2 layers!):

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www.mikronauts.com E-mail: mikronauts _at_ gmail _dot_ com
My products: Morpheus / Mem+ / PropCade / FlexMem / VMCOG / Propteus / Proteus / SerPlug
and 6.250MHz Crystals to run Propellers at 100MHz & 5.0" OEM TFT VGA LCD modules
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Unknown

Looks good.

Rayman

Here's my schematic for the LCD power supply.

It's probably very similar to the STK1000 [noparse]:)[/noparse]

Will find out in a few days if it works or not...


Update:· There's one major bug in this schematic!·· The VCOM output to the LCD should connect to the left side of R9 instead of the right side...· I.e., I should connect directly to Pin 1 of the LM8261.

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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm

My Prop Products:· http://www.rayslogic.com/Propeller/Products/Products.htm

Post Edited (Rayman) : 5/9/2010 5:53:19 PM GMT

Rayman

Finally had a chance to test out the LCD power supply section of this board and... It works!

Now, we have the +18, -8 and +5 voltages required to make it work.

Well, seems I forgot to order a few capacitors it needs and had to improvise.
Also, I made a horrible layout error and had to solder in the schottky diodes upside down.
And, the voltages are a little off, maybe because I'm using 5% resistors instead of 1%.

But, I'm just happy to get these voltages.· That was the major hurdle for getting these 3.5" touchscreens working...

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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm

My Prop Products:· http://www.rayslogic.com/Propeller/Products/Products.htm

Post Edited (Rayman) : 5/2/2010 7:25:41 PM GMT

Nick McClick

That's awesome! I like the headphone amplifier - I've never been able to find a decent through hole headphone amp, putting it onboard is really helpful.

It would be interesting to use this on top of another microcontroller... have the Prop handle the display, audio, etc., while another ucontroller does logic. I'll have to give it a whirl when these are ready.

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Rayman

Nick:· I'm also thinking about populating just the right side of the board...· That would make it just a "shield" for the touchscreen for use with a regular·Propeller Platform board.· Cost should be much lower that way.·

Not completely sure if that will work or not though...


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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm

My Prop Products:· http://www.rayslogic.com/Propeller/Products/Products.htm

WBA Consulting

Rayman, don't feel too bad about the SOT23 mixup. I have been doing contract manufacturing for 11 years and I can't tell you how many times I have had to mount SOT23s upside down or rotated with a jumper on one leg due to the same exact thing.

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Andrew Williams
WBA Consulting
WBA-TH1M Sensirion SHT11 Module
Special Olympics Polar Bear Plunge, Mar 20, 2010

rjo_

Rayman...

Obsolutely perfect!!!

I've been trying to figure out what to use for my PropPhone audio.
I built a nice amplifier and it worked for everything... except my PropPhone[noparse]:)[/noparse]

Rich

Rayman

More progress...· Now have enough stuff on the board to be able to show video.

Just started work on the driver and made the backlight come on at least...

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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm

My Prop Products:· http://www.rayslogic.com/Propeller/Products/Products.htm

Rayman

Getting real close now!

Display is rock solid and colors look good.

Just need to get rid of that one yellow line at the bottom...

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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm

My Prop Products:· http://www.rayslogic.com/Propeller/Products/Products.htm

Rayman

Got the Graphics Demo working!· The driver is in pretty good shape now.

Here's a revised LCD power supply schematic too.

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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm

My Prop Products:· http://www.rayslogic.com/Propeller/Products/Products.htm

Rayman

Look, no wires!

Battery works, SD and audio appear to work...

Need to do some more code work to check things out, but things are looking pretty good now!

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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm

My Prop Products:· http://www.rayslogic.com/Propeller/Products/Products.htm