OK, so I picked up the package from HaoRan LCD company and examined
their LCDs. Two observations, one expected, the other unexpected:
The expected observation: the end of the FPC tail that is meant to go
into a connector has straight edges, the corners are sharp 90 deg, no
rounding.
The unexpect
> [...] this idea will NOT work for our FreeCalypso handset. Our PCB will
> have 8 layers with lots of traces on every layer (intricate 2+4+2 HDI
> structure with inner buried vias and two levels of staggered microvias
> on each side), and the width of the PCB will extend only slightly past
> the w
Hi Mychaela,
> * For the data and control lines, the other end of the wire would need
> to go to a pin on an FT2232D breakout board just like the ones we use
> for FCDEV3B UARTs - how would this connection be made?
Each Kynar wire would be soldered to a classic 2.54mm female wire that can
be plug
Hi Arsenijs!
> A common practice is also putting the connector on the other side of
> the PCB, then making a slot which the cable is supposed to go through.
> This way, you don't have to worry about LCD and the connector
> occupying the same space.
Startek folks (one of the two LCD vendors I am w
> At first I thought "OK, fine, I'll just put the needed FPC connector
> on our board", but then I realized that there is a problem: where will
> the body of the connector go? Two solid objects cannot occupy the
> same space at the same time... How can the LCD rest flat against the
> PCB surface if
Hi DS!
> A PCB will certainly be very useful for your testing. As a note, you
> may also consider the possibility of directly soldering some Kynar AWG30
> to your LCD's connector. While this is a bit delicate, it's very doable
> (I did this some time ago on a JTAG's flex cable). In this way you ca
Hi Mychaela,
A PCB will certainly be very useful for your testing. As a note, you
may also consider the possibility of directly soldering some Kynar AWG30
to your LCD's connector. While this is a bit delicate, it's very doable
(I did this some time ago on a JTAG's flex cable). In this way you can
Hi Serg!
> Probably should start looking into enclosure design.
I am taking a different approach:
Step 1: design and build the first prototype motherboard in such a way
that it can be comfortably used bare on a lab bench, without any kind
of case or enclosure. The LCD will be mounted in such a
Excellent!
https://www.thingiverse.com/thing:189940/#comments
Probably should start looking into enclosure design.
I can make small stuff, up to 120x120x300 mm single part.
On Sun, Apr 15, 2018, 7:17 PM Mychaela Falconia
wrote:
> Hello FC community,
>
> An update on the FreeCalypso handset pro
Hello FC community,
An update on the FreeCalypso handset project: I am still in the process
of evaluating candidate LCDs from different vendors. All of the
candidate LCD manufacturers I am evaluating are based in Shenzhen,
China - that city seems to be the world capital for fast-turn
electronic d
Hi Mychaela,
You are unfortunately correct, that trace is on L6. Looking at L7
and bottom layers, there are many traces and I can't see any easy way
that trace could be cut without a PhD in PCB microsurgery. :/
> > BTW is there an easter egg in the PCB layout? I can read "TimLee Allen
> > Shawn J
Hi DS!
> Looking at the project in Altium, it seems the signal trace from D5 to
> U201 sits at the bottom layer.
Do you have the ability to run Altium and open the PcbDoc natively?
If so, highlight the net named FDP. I don't have the ability to run
Altium myself (no Windows), but looking at the
On Sat, Apr 07, 2018 at 06:21:15PM -0800, Mychaela Falconia wrote:
> And we still need to fix and close the sleep mode bug. I have a high
> confidence in my current hypothesis that FDP driving the flash chip's
> reset line is the culprit, but it looks like we won't be able to test
> it empiricall
So I am progressing with the evaluation of candidate LCD modules for
our FreeCalypso Libre Dumbphone handset. So far I have received
sample LCD module pieces from two different Chinese manufacturers,
let's call them Vendor A and Vendor B, 5 sample pieces from each.
There is also a third manufactur
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