Good morning,
yesterday I’ve tried using cable as short as possible to connect the Si570 to
arduino (more or less 20mm) but I have the same problem.
Now I won’t be at home until Christmas an I can’t work on it. I will try to
rebuild the manhattan circuit board using shor wire, I will use a new Si570 and
I’ll build the space variation of the Si570 schematic because it has some extra
filtering. What about if I’ll let sda and scl exit from two holes on the pcb to
the other side and connect the arduino from there? In this manner I will get
very short connecting wires and also some shielding provided by the pcb.
I also wondering if it’s better to put the 3.3V regulator near the arduino and
just feeding the Si570 board (using decoupling capacitors).
Thank you all very much for your support
Riccardo
Il giorno 10/dic/2015, alle ore 12:58, Ben Aupperlee <beninturkye@xxxxxxxxx>
ha scritto:
Hello Riccardo,
If the length of the wires between processor and synthesizer is of influence,
then those wires might form a resonater and disturb all communications, i had
the same with an usb cable with some unused connected wires. In your case
terminate those wires close to the receiver, the synthesizer wil discurage
those resonances. Or place the pul up resistors close to the synthesizer.
That might help.
Regards Ben (in Turkije)
-------- Origineel bericht --------
Van:Riccardo Montaguti
Verzonden:Thu, 10 Dec 2015 10:56:10 +0200
Aan:minima@xxxxxxxxxxxxx
Onderwerp:[minima] Re: Sweeperino problem
Yes all correct,
The unconnected cap was a try to get it working sightly decoupling the I2C
lines with 100pf capacitors, I've also added the electrolytic cap to try get
it working correctly with no luck
Today I've noticed that when I run the sweep command the sweeperino is trying
to sweep in fact on the scope the 56.32Mhz became a bit unstable and switch
off for a fraction of second but is not able to sweep correctly.
This problems seems to be a mistery
Riccardo
Il giorno 10/dic/2015, alle ore 00:01, Richard Hayter
<richardshayter@xxxxxxxxx <mailto:richardshayter@xxxxxxxxx>> ha scritto:
Hi Riccardo
the only difference between our two Si570 versions relates to the
Temperature Stability and the Total Stability. Mine = 50ppm and 61.5ppm.
Yours = 7ppm and 20ppm respectively. Reference pg 32 of the specification.
Looking at the pic I seem to see an electrolytic cap on pin 6 of the Si570?
Should not make a difference but maybe it does?. Also a longer unshielded
lead from the Pad? Also seems to be a cap hanging in the air off the pad? I
assume you are feeding 3.3V to the Si570 rail? Correct?
72 Dick N4HAY
On Wed, Dec 9, 2015 at 5:05 PM, Riccardo Montaguti <ricky451@xxxxxxxxxx
<mailto:ricky451@xxxxxxxxxx>> wrote:
Hi Richard,
First of all thank you very much for your patience!
I've attached the photo of my build,
My Si570 number is 570CCC000141DG purchased directly from SiLabs is a CMOS
20ppm version could be this difference the problem?
<image1.JPG>
Il giorno 09/dic/2015, alle ore 22:52, Richard Hayter
<richardshayter@xxxxxxxxx <mailto:richardshayter@xxxxxxxxx>> ha scritto:
Hi Riccardo,
some additional comments may assist. I was very careful to avoid ground
loops with my prototype. If you look at the pics I have a single point
ground post with a ground wire to that post from the Si570, the pots, the
LCD and the UNO.
Not sure if that makes a difference but I do note that the output level of
the Si570 with a 3.3V rail is quite significant. Recognizing that it is a
squarewave and thus calibration is off, I measured something like a +15dBm
output signal level on my separate AD8307 Power Meter.
73 de Dick N4HAY.
ZS6RSH.blogspot.com <http://zs6rsh.blogspot.com/>
On Wed, Dec 9, 2015 at 4:43 PM, Richard Hayter <richardshayter@xxxxxxxxx
<mailto:richardshayter@xxxxxxxxx>> wrote:
Hi Riccardo,
in my prototype SWEEPERINO I am using Arduino UNO.
IDE is 1.6.5.
CMOS Si570. DIGIKEY P/N 336-2518-ND. Mfg P/N 570CAC000141DG
PULLUP Resistor values = 4.7K Ohms to the 3.3V power supply.
Frequency measurement. I monitored the Si570 generated RF signal precisely
using my K2 receiver which was set across the room. This frequency compared
exactly the same as the LCD readout displayed. When I turned the tuning Pot
the frequency changed according to expectation as defined by Farhan in his
writeup. I attached a small wire (to act as an antenna) to the Si570
output BNC connector which was also terminated in a 50Ohm terminator. On
boot up the starting frequency was in the 14.2MHz range. I did not change
any calibration parameters in the Arduino Sketch.
I am now building prototype number 2 using the NANO. Initially I had issues
with the NANO Driver. Eventually I got the NANO to accept an upload once I
got the CH340 Driver correctly loaded in my Laptop. My NANO is one of the
newer ones that uses the CH340 driver as opposed to the FTDI of older
NANO's.
I had issues with running the exec on my Windows 7 machine. Eventually
Farhan sent me a different version of the exec than the one on GITHUB. This
version works perfectly.
So far I have the NANO working just with the LCD connected. It displays
Sweeperino V2.0 correctly.
This evening I will connect the Si570 to the NANO and will also simulate
the RF Power Meter input with a potentiometer.
I am also attaching some pics of prototype 1 (using the UNO). Can you see
the small handmade breakout board I fashioned for the Si570?.
Some additional comments. I get exactly the same readout on the serial
monitor as you are seeing: ie
*Sweeperino v0.02
*Testing for Si570
Successfully initialized Si570
*Si570 ON
However I don't know what you mean by the Radiono output. How do you get
that to show on the serial monitor?
You may also be interested to note that I was never able to change the
frequency using an 'f' command on the serial monitor command line. I was
able to change the Si570 frequency with the pot no problem. I was also
able to sweep the frequency no problem using the executable.
I will report back on findings on that.
Hopefully this information will assist?
72 de Dick N4HAY
ZS6RSH.blogspot.com <http://zs6rsh.blogspot.com/>
On Wed, Dec 9, 2015 at 11:53 AM, Riccardo Montaguti <ricky451@xxxxxxxxxx
<mailto:ricky451@xxxxxxxxxx>> wrote:
Farhan, no my sweeperino doesn’t work properly because I see the 14.5Mhz
frequency displayed on the LCD but by checking with scope the Si570 output
I get a 56.32Mhz wave.
Dick could you please explain to me some more detail? What is the pullups
value? and what version of the arduino IDE are you using? Did you check the
Si570 output with a scope?
Thank you for the help
Riccardo
Il giorno 09/dic/2015, alle ore 16:51, Richard Hayter
<richardshayter@xxxxxxxxx <mailto:richardshayter@xxxxxxxxx>> ha scritto:
Hello Riccardo,
I am also building a Sweeperino using CMOs version. I have a prototype of
it working. Startup frequency is in the 14mHz area. This is on the UNO.
Now I am also able to upload the code into the NANO. This evening I will
be connecting the Si570. I will let you know if I get it working.
73 Dick N4HAY
ZS6RSH.blogspot.com <http://zs6rsh.blogspot.com/>
On Wed, Dec 9, 2015 at 4:29 AM, Riccardo Montaguti <ricky451@xxxxxxxxxx
<mailto:ricky451@xxxxxxxxxx>> wrote:
Good morning,
I’m building a sweeperino because would be a very useful tool but I’m
having problems with the Si570.
I’ve uploaded an arduino nano with the code without getting errors but
when i connect the arduino to the si570 I can get only the 56.32Mhz
frequency even if the LCD display shows 14.5Mhz and also by tuning the
potentiometer.
I’ve checked by the arduino serial window and I get the following:
*Sweeperino v0.02
*Testing for Si570
Successfully initialized Si570
*Si570 ON
So I think the I2C is communicating but maybe there is a freeze in the
code.
By using the radiono program I have the same problem and I get in the
serial monitor this:
Radiono starting - Version: 0.4
Tests successful!
Successfully initialized Si570
--- Si570 Debug Info ---
Crystal frequency calibrated at: 20283316
Status: 1
Register[7] = e1
Register[8] = c2
Register[9] = b6
Register[10] = 2a
Register[11] = a5
Register[12] = 93
HsDivider = 11 N1 = 8
Reference Frequency (hex) : 0002b62aa593
Reference Frequency (double): 43.385
I’ve build the circuit exactly as the original schematic (I use 4.7K
pull-ups) and I’ve only changed the LCD pins to get it working properly.
Could someone please give me some advices? I’ve also tried to change the
Si570 but with no luck
Thank you for the kind attention
Riccardo Montaguti
