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Re: Uploading Sketch to ADXL345 Eval Board

 by coyote20000 ¦  Sun Aug 26, 2012 2:33 am ¦  Forum: SparkFun Product Questions ¦  Topic: Uploading Sketch to ADXL345 Eval Board ¦  Replies: 1 ¦  Views: 250

What are you uploading? I don't own one of these, but from what I can tell, you can program the board via an ICSP programmer if need be. The Arduino example sketches on the SF page appear to use an external Arduino to communicate with the board via I2C. If you are using the example sketches, upload ...

Re: Pro Micro - 5V/16MHz newbie question

 by coyote20000 ¦  Sun Aug 19, 2012 2:27 am ¦  Forum: Arduino ¦  Topic: Pro Micro - 5V/16MHz newbie question ¦  Replies: 2 ¦  Views: 427

Vcc to Gnd

Re: Advice / help: FT232RL USB to Serial

 by coyote20000 ¦  Sun Jul 22, 2012 11:30 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Advice / help: FT232RL USB to Serial ¦  Replies: 2 ¦  Views: 442

What do you have it connected to that's telling you the data isn't correct?

You can go into XP and open HyperTerminal to the assigned com port. Put a jumper between Rx and Tx and the data typed should be echoed back to hyperterminal.

Re: Level converter RX/TX issue

 by coyote20000 ¦  Sat Jul 07, 2012 12:53 am ¦  Forum: Arduino ¦  Topic: Level converter RX/TX issue ¦  Replies: 16 ¦  Views: 2808

Joeisi,
He's converting a 5v data line to 3.3v. He's not looking for a supply rail.
The level shifter is dropping his data line to 2.5v which might be where he's having issues.

Re: Level converter RX/TX issue

 by coyote20000 ¦  Fri Jul 06, 2012 12:58 am ¦  Forum: Arduino ¦  Topic: Level converter RX/TX issue ¦  Replies: 16 ¦  Views: 2808

HV to R1 (10K) to R2 (20K) to GND

Tap the point between R1 and R2 for 2/3 the HV. Approx 3.3v
LV = HV * (R2 / (R1+ R2))
LV = 5 * (20) / (30)
LV = 5 * (2/3)
LV = 3.333333333

Re: Level converter RX/TX issue

 by coyote20000 ¦  Wed Jul 04, 2012 12:39 pm ¦  Forum: Arduino ¦  Topic: Level converter RX/TX issue ¦  Replies: 16 ¦  Views: 2808

Yes that looks correct. The level converter has (2x) voltage dividers on it so if you ever need a converter to go from HV to LV that's all there is to it. I still don't really know what a TP-Link is, except that it's a router. I'm not sure how you are tapping into a 3.3v serial line with that.. Supp...

Re: Level converter RX/TX issue

 by coyote20000 ¦  Tue Jul 03, 2012 10:37 pm ¦  Forum: Arduino ¦  Topic: Level converter RX/TX issue ¦  Replies: 16 ¦  Views: 2808

It's alright,
I just figured he might have the level shifter hooked up wrong or it's just not working..

Re: Level converter RX/TX issue

 by coyote20000 ¦  Tue Jul 03, 2012 5:11 pm ¦  Forum: Arduino ¦  Topic: Level converter RX/TX issue ¦  Replies: 16 ¦  Views: 2808

pots wrote: I have a TP-Link mr3040 (3.3v) with a serial connection to the arduino uno. Common ground, the 3.3v on the LV side RX to TX to the HV on the arduino side.
Look again... He's connecting 5vdc Arduino TX to a 3.3vdc RX. All you need is a voltage divider...

Re: Level converter RX/TX issue

 by coyote20000 ¦  Tue Jul 03, 2012 12:37 pm ¦  Forum: Arduino ¦  Topic: Level converter RX/TX issue ¦  Replies: 16 ¦  Views: 2808

Just put a voltage divider between the HV and LV sides. Arduino TX to 10Kohm resistor to 10Kohm resistor to ground. Then... 3.3v RX side to the middle of the two 10Kohm resistors. (All common ground) (Yeah yeah yeah, before everyone complains, I know it will be 2.5v on the LV side) It works fine for...

Re: Unsure how shield works

 by coyote20000 ¦  Thu Jun 28, 2012 11:25 am ¦  Forum: Arduino ¦  Topic: Unsure how shield works ¦  Replies: 2 ¦  Views: 513

One idea that might help you out. For temporary circuits (developing/testing) use a breadboard. For semi-permanent circuits (the testing is done, and you want to use what you made but don't want parts falling out all the time AND you want to reuse the board/interface/shield again and again, try wire...

Re: Getting the ProMicro to work on Win7x64

 by coyote20000 ¦  Mon Jun 04, 2012 3:18 pm ¦  Forum: Arduino ¦  Topic: Getting the ProMicro to work on Win7x64 ¦  Replies: 4 ¦  Views: 970

Doh! I have the promini not the promicro. Sorry man..

Re: Getting the ProMicro to work on Win7x64

 by coyote20000 ¦  Sat Jun 02, 2012 11:26 pm ¦  Forum: Arduino ¦  Topic: Getting the ProMicro to work on Win7x64 ¦  Replies: 4 ¦  Views: 970

No problems occured with my system.
I'm not even sure I needed the FTDI drivers. Sounds like you have some sort of corruption.
Try uninstalling the drivers. Do you see the ftdi device at all before the blue screen occurs?

Re: Arduino Pro Mini - suitable as a first board?

 by coyote20000 ¦  Sat Apr 14, 2012 1:42 am ¦  Forum: Arduino ¦  Topic: Arduino Pro Mini - suitable as a first board? ¦  Replies: 7 ¦  Views: 1128

That depends on what you will be connecting to it. If most of the items are 5v then go with the 5v version. If they are 3.3 then it's easier to use the 3.3v version. You can always level shift, but if high speed communication is required, level shifting the data could cause a problem and slow you do...

Re: Arduino not powering up over USB

 by coyote20000 ¦  Sat Apr 14, 2012 1:34 am ¦  Forum: Arduino ¦  Topic: Arduino not powering up over USB ¦  Replies: 3 ¦  Views: 1099

If you have an atmega in a dip package, I would start by removing the chip and see if the regulator gets hot.

Re: Arduino Pro Mini - suitable as a first board?

 by coyote20000 ¦  Sun Apr 01, 2012 10:21 pm ¦  Forum: Arduino ¦  Topic: Arduino Pro Mini - suitable as a first board? ¦  Replies: 7 ¦  Views: 1128

I think it's a good choice. I have both types and haven't fried either. The shields for the standard make trying certain projects easier but other than that it's the same.
The pro-mini fits in a breadboard nicely too!

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