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Re: RFM22B - why only 433MHz sold by SFE?

 by motopic ¦  Thu Jan 12, 2012 6:13 am ¦  Forum: Wireless/RF ¦  Topic: RFM22B - why only 433MHz sold by SFE? ¦  Replies: 2 ¦  Views: 555

IIRC you can get 915Mhz from
They are in the NE USA and ship fast.

Re: free toolchain for stm32f405/407

 by motopic ¦  Thu Jan 12, 2012 6:11 am ¦  Forum: Everything ARM and LPC ¦  Topic: free toolchain for stm32f405/407 ¦  Replies: 20 ¦  Views: 7951

Thanks UhClem for the reference. I will have to see how their examples are setup. I am curious how you are using the usb, ethernet and other advanced stuff without their libs? I am using the mthomas code setups for M3, which I understand after using it a long time, but this means we have to make lin...

Re: SD library - improve performance?

 by motopic ¦  Thu Jan 12, 2012 6:05 am ¦  Forum: Arduino ¦  Topic: SD library - improve performance? ¦  Replies: 11 ¦  Views: 3371

uh, ok, well just reading your post I have no idea wtf you are talking about. What chip? What library are you using, there is more than 1 sd lib out there. Most likely to get the fastest speed would be to just dump the files on there in binary at known offsets. Forget about using a filesystem. That ...

Re: free toolchain for stm32f405/407

 by motopic ¦  Wed Jan 11, 2012 10:51 am ¦  Forum: Everything ARM and LPC ¦  Topic: free toolchain for stm32f405/407 ¦  Replies: 20 ¦  Views: 7951

The codesourcery free toolchain will work. BUT, there are the required startup and linker scripts that have to be made. The STM32F4 demos that come with the Discovery board are all for $$$ compilers. I was going to start from the STM32M3 (aka stm32f10x) tools and try to get to F4, but have not gotte...

Re: HELP Cheap/Interchangable Bread Boarded Arduino

 by motopic ¦  Wed Jan 11, 2012 6:05 am ¦  Forum: Arduino ¦  Topic: HELP Cheap/Interchangable Bread Boarded Arduino ¦  Replies: 5 ¦  Views: 993

I concur on the RBBB. You can buy them as a kit, assembled or just the pcb. Kit contains more parts than you listed for only $13 each. RBBB will work in a breadboard just fine. moderndevice is in the usa, and ships very fast. He also carries pre-programmed 328 w/bootloader. There is...

Re: Moving away from Arduino....

 by motopic ¦  Tue Dec 13, 2011 6:34 am ¦  Forum: AVR Microcontrollers ¦  Topic: Moving away from Arduino.... ¦  Replies: 6 ¦  Views: 2596

teensys aren't cheaper. (ok they are, but not too much cheaper) Look at RBBB. At $13 each, you can still use your arduino sw, and the hw is already designed. Also you can mod the kits quite a bit, and since he posts the design, you can study it and see how to make your own even more...

Re: component availability

 by motopic ¦  Mon Dec 05, 2011 6:25 am ¦  Forum: SparkFun Product Questions ¦  Topic: component availability ¦  Replies: 4 ¦  Views: 468

Thanks, just what I was looking for. I wish there was a US source though. EDIT: ugh, sorry, totally skipped the 2x5 part...ignore. should have them: moderndevice is a great shop, and does fast shipp...

Re: Hand soldering of SMDs

 by motopic ¦  Fri Nov 18, 2011 11:06 am ¦  Forum: SparkFun Product Questions ¦  Topic: Hand soldering of SMDs ¦  Replies: 2 ¦  Views: 405

Glue the part upside down to a piece of perfboard. Remember you are pinning out in reverse! Run small bell wire from each lead to a .1 pin. Jump this header to your other devices. Use a tiny bit of solder paste. Iron at 350F or so, you need a adj temp iron and a fine tip. 1 sec heat time, 2 at most.

Re: Solder paste syringe dispenser (via compressed air) woes

 by motopic ¦  Thu Nov 17, 2011 6:12 am ¦  Forum: PCB Design Questions ¦  Topic: Solder paste syringe dispenser (via compressed air) woes... ¦  Replies: 2 ¦  Views: 2268

Look at Zeph products.
They have tools, paste (leadfree too), and tips and nozzles of all sizes.

Re: TQFP-48

 by motopic ¦  Thu Nov 03, 2011 5:28 am ¦  Forum: PCB Design Questions ¦  Topic: TQFP-48 ¦  Replies: 6 ¦  Views: 3704

All you need is paste and a good iron. A good paste makes the world of difference. You dont need a mask, but a good syringe helps a ton as well. See: Adjust your layout for the part like others said, and also layout the pcb so you can use a hand iron (not too close ...

Re: Xbee/Wireless

 by motopic ¦  Thu Nov 03, 2011 5:22 am ¦  Forum: Wireless/RF ¦  Topic: Xbee/Wireless ¦  Replies: 18 ¦  Views: 3028

I used 2 series1 in a project for the house. Once set to the same settings they talk to each other ok. There is a 'connect' time thats several seconds, so if your system goes to sleep, the wake time is several seconds. The low power units work within my 2 story, 2800sqft house with no issues (chip a...

Re: Breakaway female headers

 by motopic ¦  Mon Oct 31, 2011 5:27 am ¦  Forum: SparkFun Product Questions ¦  Topic: Breakaway female headers ¦  Replies: 4 ¦  Views: 698

SF will probably ban me for this, but o well. - female .1 strip headers are like 1/6 the cost of SF parts.
alas you will wait at least 2 weeks to get them. is middle ground, try them (also US based).

Re: “Selling Your Widget on SparkFun” Advanced Version 2

 by motopic ¦  Fri Oct 14, 2011 5:20 am ¦  Forum: New Product Ideas ¦  Topic: “Selling Your Widget on SparkFun” Advanced Version 2 ¦  Replies: 5 ¦  Views: 1883

try seeedstudio

Re: Beginner Atmega328 Shield Design (EDIT)

 by motopic ¦  Wed Oct 12, 2011 5:43 am ¦  Forum: PCB Design Questions ¦  Topic: Beginner Atmega328 Shield Design (EDIT) ¦  Replies: 2 ¦  Views: 1660

Go look at ModernDevice's RBBB. I believe he posts the schematic in his docs, and you can purchase JUST the pcbs from him if you want to mod a build. I bought like 10 of these, they are super easy to build and use, program using the FTDI. And they are reasonably priced.

Re: ARM development board for DC motor control and Linux

 by motopic ¦  Tue Oct 11, 2011 6:21 am ¦  Forum: Everything ARM and LPC ¦  Topic: ARM development board for DC motor control and Linux ¦  Replies: 9 ¦  Views: 3303

To control 1 motor(relays really?) and a few sensors Linux OS is WAY overkill, and you'll spend a ton of time and effort just getting the OS set. Arduino or ARM7 are easy to get going. STM32 is a bit harder to setup (fewer examples and such). How are you planning to control the motor, or does it alr...

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