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Deutsch / Re: Starterkit - Zoetrope - Mo...
Last post by MGOS - Today at 07:23 pm
Wenn das Geräusch als störend empfunden wird, kann man auch einfach die PWM-Frequenz erhöhen. Normalerweise liegt diese bei 490 bzw. 980 Hz, also im hörbaren Bereich. Lässt sich aber leicht umkonfigurieren, wie hier beschrieben. Alles über 16 kHz sollte nicht mehr zu hören sein. Du musst allerdings aufpassen, je nachdem welchen PWM-Kanal du benutzt veränderst du auch die Geschwindigkeit des millis-Timers und musst evtl. andere Stellen im Code entsprechend anpasssen (wenn du millis(), delay() oder Servos benutzt).

Gruß,
Marv
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sorry Coding Badly, I formulate better demand:
The compiler do not admit the instruction "serial.print". At the begin on the sketch  I wrote the instruction "#include SoftwareSerial.h" but the problem remains.
Can you help me ?
P.S. sorry for my bad english
Mario
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Project Guidance / A Large Project.. Multiple Ard...
Last post by VA3WPN - Today at 07:18 pm
I have plans for a project that will have an antenna rotator controller, SWR Meter, Frequency display, GPS, APRS Beacon, Morse  Code and RTTY decoder. There will be output to a 3.5" LCD screen, as well as USB connection for computer control. What I know is that this is A LOT for a single Arduino to do, but how about partitioning the processes out to multiple Arduino's? Or should I be looking at an other piece of equipment?
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Project Guidance / Re: Stock keeper (LCD)
Last post by Jekub - Today at 07:18 pm
Is there a particular way that this LCD needs to be connected to work with the LCD libraries?
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Okay, some news, both PCB have a hardware problem (bad soldering).
Now they both send me 0x000000, can I expect something?

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This usually means that the library has either not been installed or it's installed in the wrong place. The angle brackets means you have that library loaded in the default include directory, which is usually off the root install directory, in the libraries subdirectory.
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Arduino Due / Re: Test of the linear CCD TSL...
Last post by Simone72 - Today at 07:15 pm
Thanks Themavery,
I had already found the blog of Dave Erickson, really well done!

I tried to add to your code setting the REG_ADC_MR but it generates error ...
I still try ... >:(
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Have you got the MakeItRobotics library installed ?  If so where, and did you stop/start the IDE after installing it ?
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The wiring is right. I had the exact same problem. It's a voltage problem. Well, in fact it is a current problem.

You should NOT power up the SD module with 5V.

Instead, use Arduino's 3.3V pin to power up the SD module, so you will bypass it's voltage regulator. That voltage regulator is the source of the problem as it can't drive the current needed for writing. Maybe it can work in some SD cards. But in some cards it won't work.

That is, connect the 3.3V Arduino's pin into the 3.3V SD module's pin.

However you'll be facing a second problem:

MOSI, MISO SCK and CS should be working at 3.3V or you will kill the SD card. Not today but in a near future.

You have two options:
1) Use a voltage conversion chip in MOSI, MISO SCK and CS.
2) Operate the Arduino at 3.3V

Writing requires much more power than creating files, deleting files, create folders, navigate into folders... That's why you're facing this issue.
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Well, I see you didn't get any help on this one. People tend to be a little sensitized this time of the year, as this is when all the students show up wanting last-minute solutions for their class projects.

1. don't believe the figures like 1600m outdoor range with an Xbee at 2.4Ghz.  The best
    I ever got reliably was 100m with XBee Pro using the whip antenna.

2. I've used XBees on my robots for 7 or 8 years now, and am currently vacating their
    use completely. Where I live now, I can pick up 30 [wideband] wifi routers, and XBee
    has to compete with all of them. 7-8 years ago, there were relatively few routers in
    contention, so Xbee worked pretty good, now everyone has a router.

3. I am now going to 433 Mhz, although 915 might also be ok, and there is probably
    very little interference on either band, as compared with 2.4 Ghz. Also, all trans-
    missions are narrow bandwidth, and you have many more frequencies to choose
    from.

You might take a look at the Moteinos with RFM69HW radios. These might actually make 1600m under good conditions. Plus, the Moteino with radio, and including an Arduino chip, is about half the price of an XBee Pro.

https://lowpowerlab.com/shop/
https://lowpowerlab.com/shop/index.php?_route_=moteino-r4
https://lowpowerlab.com/shop/index.php?_route_=moteinomega

Note that the original jeelib library for the RFM12 [low-power] radios was a piece of junk full of bugs, but Felix adapted it and fixed many of the bugs. He also wrote the new library for the RFM69HW radios from scratch, and that seems ok.

EDIT:
One more point. If you go to radios with external antennas, try to avoid the uFL connector types, and go for the SMA types. The uFL connectors are extremely flimsy, and easy to ruin.
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