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<font face="Comic Sans MS"> Thanks Louis, I counted the
connections to the gyro and it is not SPI, you are probably
correct. I'm probably going to box the carcass and all the new
parts and put this quad on the "latter" work bench cue. I will
fix the Syma X6, but I got a fixed wing almost done and 2 more on
the ways. I also got 4 brushless motors, 4 ESC's, 4 10" props,
an open source controller and all the RF gear for a more serious
quad. These parts are begging to be crucified...</font><br>
<font face="Comic Sans MS"> </font><br>
<font face="Comic Sans MS"> Louis Mamakos wrote on 6/7/2015 9:46 PM:
</font>
<blockquote type="cite">
<meta http-equiv="Content-Type" content="text/html;
charset=ISO-8859-1">
The nRF24L01 (if that's what it is vs. nRF24L1 you mentioned) is
widely available and there are data sheets trivially available for
it. See <a
href="http://www.nordicsemi.com/eng/Products/2.4GHz-RF/nRF24L01"
class="">http://www.nordicsemi.com/eng/Products/2.4GHz-RF/nRF24L01</a> if
you've not found something elsewhere. There's also a bunch of
Arduinio libraries and examples floating around out there. It has
a standard SPI interface, used to access the internal registers as
described in the datasheet.
<div class="">
<div class=""><br class="">
</div>
<div class="">However, there's all sorts of ways to frame
payload over the RF MAC layer, so you'll not get much help
from the data sheets there. You an get nRF24L01 modules in
various format for pretty cheap, less than $10.</div>
<div class=""><br class="">
</div>
<div class="">The Inversense MPU-3050 I think has only an I2C
interface. See <a
href="http://store.invensense.com/ProductDetail/MPU3050-InvenSense-Inc/25805/"
class="">http://store.invensense.com/ProductDetail/MPU3050-InvenSense-Inc/25805/</a>
This is a ~$5.00 part if you need to replace it, though you'll
really want a hot air rework tool deal with this SMD part.</div>
<div class=""><br class="">
</div>
<div class="">louie</div>
<div class="">wa3ymh<br class="">
<div class=""><br class="">
<div>
<blockquote type="cite" class="">
<div class="">On Jun 7, 2015, at 7:54 PM, Alex Fraser
<<a href="mailto:beatnic@comcast.net" class="">beatnic@comcast.net</a>>
wrote:</div>
<br class="Apple-interchange-newline">
<div class=""><span style="font-size: 12px; font-style:
normal; font-variant: normal; font-weight: normal;
letter-spacing: normal; line-height: normal;
text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; word-spacing: 0px;
background-color: rgb(255, 255, 255); float: none;
display: inline ! important;" class="">Thanks Terry,
that does help. I put "SPI" and "Syma" together in
the Google box and got some hits. Sparkfun has a
nice write up</span><a class="moz-txt-link-freetext"
href="https://learn.sparkfun.com/tutorials/serial-peripheral-interface-spi"
style="font-size: 12px; font-style: normal;
font-variant: normal; font-weight: normal;
letter-spacing: normal; line-height: normal;
text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; word-spacing: 0px;
background-color: rgb(255, 255, 255);">https://learn.sparkfun.com/tutorials/serial-peripheral-interface-spi</a><br
style="font-size: 12px; font-style: normal;
font-variant: normal; font-weight: normal;
letter-spacing: normal; line-height: normal;
text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; word-spacing: 0px;
background-color: rgb(255, 255, 255);" class="">
<span style="font-size: 12px; font-style: normal;
font-variant: normal; font-weight: normal;
letter-spacing: normal; line-height: normal;
text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; word-spacing: 0px;
background-color: rgb(255, 255, 255); float: none;
display: inline ! important;" class="">I also found
a guy in Hong Kong who reverse engineered another
quad <span class="Apple-converted-space"> </span></span><a
class="moz-txt-link-freetext"
href="https://learn.sparkfun.com/tutorials/serial-peripheral-interface-spi"
style="font-size: 12px; font-style: normal;
font-variant: normal; font-weight: normal;
letter-spacing: normal; line-height: normal;
text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; word-spacing: 0px;
background-color: rgb(255, 255, 255);">https://learn.sparkfun.com/tutorials/serial-peripheral-interface-spi</a><br
style="font-size: 12px; font-style: normal;
font-variant: normal; font-weight: normal;
letter-spacing: normal; line-height: normal;
text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; word-spacing: 0px;
background-color: rgb(255, 255, 255);" class="">
<br style="font-size: 12px; font-style: normal;
font-variant: normal; font-weight: normal;
letter-spacing: normal; line-height: normal;
text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; word-spacing: 0px;
background-color: rgb(255, 255, 255);" class="">
<span style="font-size: 12px; font-style: normal;
font-variant: normal; font-weight: normal;
letter-spacing: normal; line-height: normal;
text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; word-spacing: 0px;
background-color: rgb(255, 255, 255); float: none;
display: inline ! important;" class="">When I looked
up the<span class="Apple-converted-space"> </span></span><font
style="font-size: 12px; font-style: normal;
font-variant: normal; font-weight: normal;
letter-spacing: normal; line-height: normal;
orphans: auto; text-align: start; text-indent: 0px;
text-transform: none; white-space: normal; widows:
auto; word-spacing: 0px; -webkit-text-stroke-width:
0px; background-color: rgb(255, 255, 255);" class="">nRF24L1
RF chip it said it had on board processing. I guess
that circuitry manages the SPI interface. <span
class="Apple-converted-space"> </span></font><span
style="font-size: 12px; font-style: normal;
font-variant: normal; font-weight: normal;
letter-spacing: normal; line-height: normal;
text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; word-spacing: 0px;
background-color: rgb(255, 255, 255); float: none;
display: inline ! important;" class="">I'll have to
go back and look at the board again. Maybe the
gyroscope chip is on the same bus too. I'll also
have to open up the transmitter again to look at
that board with my newly gained insights.</span><br
style="font-size: 12px; font-style: normal;
font-variant: normal; font-weight: normal;
letter-spacing: normal; line-height: normal;
text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; word-spacing: 0px;
background-color: rgb(255, 255, 255);" class="">
<br style="font-size: 12px; font-style: normal;
font-variant: normal; font-weight: normal;
letter-spacing: normal; line-height: normal;
text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; word-spacing: 0px;
background-color: rgb(255, 255, 255);" class="">
<font style="font-size: 12px; font-style: normal;
font-variant: normal; font-weight: normal;
letter-spacing: normal; line-height: normal;
orphans: auto; text-align: start; text-indent: 0px;
text-transform: none; white-space: normal; widows:
auto; word-spacing: 0px; -webkit-text-stroke-width:
0px; background-color: rgb(255, 255, 255);" class="">WB4JFI
wrote on 6/7/2015 4:36 PM:
<blockquote type="cite" class="">
<div dir="ltr" class="">
<div style="font-size: 10pt;" class="">
<div class="">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 class=""> </div>
<div class="">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 class=""> </div>
<div class="">Hope that helps.</div>
<div class="">73, Terry, N4TLF</div>
<div class=""> </div>
<div style="font-size: small; text-decoration:
none; font-weight: normal; font-style:
normal; display: inline;" class="">
<div style="font-style: normal;
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font-size: 10pt; line-height: normal;"
class="">
<div class=""> </div>
<div style="background-color: rgb(245,
245, 245); background-position: initial
initial; background-repeat: initial
initial;" class="">
<div class=""><b class="">From:</b><span
class="Apple-converted-space"> </span><a
title="beatnic@comcast.net"
href="mailto:beatnic@comcast.net"
class="">Alex Fraser</a></div>
<div class=""><b class="">Sent:</b><span
class="Apple-converted-space"> </span>Sunday,
June 07, 2015 4:23 PM</div>
<div class=""><b class="">To:</b><span
class="Apple-converted-space"> </span><a
title="tacos@amrad.org"
href="mailto:tacos@amrad.org"
class="">TACOS</a></div>
<div class=""><b class="">Subject:</b><span
class="Apple-converted-space"> </span>Re:
Syma X6 repair and mods</div>
</div>
</div>
<div class=""> </div>
</div>
<div style="font-size: small; text-decoration:
none; font-weight: normal; font-style:
normal; display: inline;" class=""><font
class="">I tried to solder the broken
traces, but just couldn't do it. I've
ordered a new main board. <span
class="Apple-converted-space"> </span></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.<span class="Apple-converted-space"> </span><br
class="">
<br class="">
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. <span
class="Apple-converted-space"> </span><br
class="">
<br class="">
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 class="">
<br class="">
Alex Fraser wrote on 6/5/2015 4:08 PM:
<blockquote type="cite" class=""><font
class=""> <span
class="Apple-converted-space"> </span>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 class="">
<br class="">
<br class="">
<br class="">
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
class="">
<br class="">
<br class="">
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