<HTML><HEAD>
<META content="text/html; charset=UTF-8" http-equiv=Content-Type></HEAD>
<BODY dir=ltr bgColor=#ffffff text=#000000>
<DIV dir=ltr>
<DIV style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial'; COLOR: #000000">
<DIV>If you are asking what those other pins are, they are a standard Serial
Peripheral Interface (SPI) communications interface. It is a 3/4 wire
interface, usually between central processors and peripheral devices.</DIV>
<DIV> </DIV>
<DIV>SCK is the serial clock signal, generated by the master. MISO is the
Master In Slave Out signal, used by the slave/peripheral to communicate data
back to the MCU/master. MOSI is the opposite, Master Out Slave In, which
the MCU/master communicates data to the slave/peripheral. There is also a
Chip Enable, or Chip Select, or a lot of other names that indicate the
Master/MCU wants to talk to that device, by holding that pin low. Many
peripherals can share the same SPI bus, and the master only pulls down the CS or
CE or CSN of the one device it wants to talk to. There is usually only one
Chip Enable type signal per device, but your may have more. Google SPI for
more info.</DIV>
<DIV> </DIV>
<DIV>Hope that helps.</DIV>
<DIV>73, Terry, N4TLF</DIV>
<DIV> </DIV>
<DIV
style='FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: "Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; DISPLAY: inline'>
<DIV style="FONT: 10pt tahoma">
<DIV><FONT face=Arial></FONT> </DIV>
<DIV style="BACKGROUND: #f5f5f5">
<DIV style="font-color: black"><B>From:</B> <A title=beatnic@comcast.net
href="mailto:beatnic@comcast.net">Alex Fraser</A> </DIV>
<DIV><B>Sent:</B> Sunday, June 07, 2015 4:23 PM</DIV>
<DIV><B>To:</B> <A title=tacos@amrad.org href="mailto:tacos@amrad.org">TACOS</A>
</DIV>
<DIV><B>Subject:</B> Re: Syma X6 repair and mods</DIV></DIV></DIV>
<DIV> </DIV></DIV>
<DIV
style='FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: "Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; DISPLAY: inline'><FONT
face="Comic Sans MS">I tried to solder the broken traces, but just couldn't do
it. I've ordered a new main board. </FONT>I almost burned my nose
trying to solder using a jewelers loup. At 10x it focused at about an
inch. I always ask doctors if they are getting rid of any of their old
optics like they use in surgery, that stuff is expensive. I might be able
to salvage this board, I've a plan for using a ribbon cable, but for a while
this critter will sit on a shelf as I have two other builds on the table.
<BR><BR>I did look up the chips. The RF chip was buried in a black goo,
but I found a reference to it in a RC forum. It's a nRF24L1 which is a
transceiver on 2.4 GHZ. Very low power. In the picture it's on the
RF deck. Under the ROHS sticker is the main processor a STM8S00, 16 bit
and IIRC can communicate at 2 MHz. It has on board memory. In the
overall picture the chip to the left of the main processor is an Invensense
MPV-3050c which is the 3 axis gyroscope. It is used in cell phones so it
is fairly cheap and available. <BR><BR>I wonder if the labeled pins on the
RF deck are recognizable to some folks right off. Vdd and GND I got.
MISO, MOSI, SCK, CSN and CE even looking at the data sheet were strange to
me. Are these common to all processors?<BR><BR>Alex Fraser wrote on
6/5/2015 4:08 PM:
<BLOCKQUOTE type="cite"><FONT face="Comic Sans MS"> I have
to replace two motor assemblies on my Syma X6 quad copter. That is a
simple straight forward solder job. I thought while I had the board off
the frame I might modify the antenna for more range. In the first
picture you can see the layout. The board is 1.82" square</FONT>.
There was a small board I call the "RF deck" which laid flat on the main
board. I suppose that is so they can put whatever radio they want on the
main board. I pulled the RF deck upright to trace the ground so I could find a
pad to solder on the coax shield for the antenna, They had attached the
RF deck to the main board in the board construction, in an oven I guess, so
three connections on the bottom were soldered to traces under the board.
The traces of course broke when I pulled on the board. When I fix it
I'll leave it upright and just hope it don't cause an RF problem, pick up
noise or vibration etc.<BR><BR><IMG alt=""
src="wlmailhtml:{5E22FFF8-8C61-4CD0-831B-FC56155BB0C2}mid://00003902/!cid:part1.06060009.03030302@comcast.net"
width=800 height=600><BR><BR>I circled the injured traces. It is at 2.4
GHz. I have no idea what "RHOS" is but the label peeled off and I'm
going to search for that chip just for fun.,<BR><BR><IMG alt=""
src="wlmailhtml:{5E22FFF8-8C61-4CD0-831B-FC56155BB0C2}mid://00003902/!cid:part2.06090200.05000301@comcast.net"
width=800 height=600><BR><PRE class=moz-signature cols="72">--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
No electrons were harmed in the creation of this message
--------------------------------------------------------
~~~******************* Alex Fraser *******************~~~
--------------------------------------------------------
[[[[[[~~^^^#___=>>>```/\/\**O**/\/\```<<<=___#^^^~~]]]]]]
</PRE><BR>
<FIELDSET class=mimeAttachmentHeader></FIELDSET> <BR><PRE wrap="">_______________________________________________
Tacos mailing list
<A class=moz-txt-link-abbreviated href="mailto:Tacos@amrad.org">Tacos@amrad.org</A>
<A class=moz-txt-link-freetext href="https://lists.amrad.org/mailman/listinfo/tacos">https://lists.amrad.org/mailman/listinfo/tacos</A>
</PRE></BLOCKQUOTE><BR><BR><PRE class=moz-signature cols="72">--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
No electrons were harmed in the creation of this message
--------------------------------------------------------
~~~******************* Alex Fraser *******************~~~
--------------------------------------------------------
[[[[[[~~^^^#___=>>>```/\/\**O**/\/\```<<<=___#^^^~~]]]]]]
</PRE>
<P>
<HR>
_______________________________________________<BR>Tacos mailing
list<BR>Tacos@amrad.org<BR>https://lists.amrad.org/mailman/listinfo/tacos<BR></DIV></DIV></DIV></BODY></HTML>