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Re: Newb looking for some guidance

 by elevator4 ¦  Sun Nov 02, 2014 3:14 pm ¦  Forum: Wireless/RF ¦  Topic: Newb looking for some guidance ¦  Replies: 2 ¦  Views: 1090

Re: Too confusing to do this myself, perhaps simple for you

 by elevator4 ¦  Mon Oct 20, 2014 4:53 am ¦  Forum: AVR Microcontrollers ¦  Topic: Too confusing to do this myself, perhaps simple for you $$$? ¦  Replies: 2 ¦  Views: 2108

Hi,
having done this before (on a different micro, and analog) I don't see any problem. You may contact me via PM.
-e

Re: Long Distance Mail Notifier

 by elevator4 ¦  Thu Aug 21, 2014 4:24 pm ¦  Forum: Projects ¦  Topic: Long Distance Mail Notifier ¦  Replies: 7 ¦  Views: 1092

Agree with Stevech. You may want to look at their -LR models, still sub-GHz, for longest range at a slower data rate, which I assume is of no concern in your application. As for the on/off switching, you want to wire the box so that the mailman turns it on, the Arduino latches it on until its job is...

Re: need resonator part number

 by elevator4 ¦  Thu Nov 14, 2013 6:07 pm ¦  Forum: PCB Design Questions ¦  Topic: need resonator part number ¦  Replies: 3 ¦  Views: 1454

Hi,
here's what i found on mouser:
http://it.mouser.com/Passive-Components ... r&FS=True

-E

Re: Read data from SIGMA heart belt via wireless...?

 by elevator4 ¦  Tue Apr 09, 2013 2:24 pm ¦  Forum: Wireless/RF ¦  Topic: Read data from SIGMA heart belt via wireless...? ¦  Replies: 1 ¦  Views: 431

Hi bubbolo,
Judging from the product description the protocol must substantially differ from the Polar one; must be proprietary to SIGMA, so I suggest you contact them.

Re: Real World Mag/Compass Sensors

 by elevator4 ¦  Mon Feb 18, 2013 4:38 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Real World Mag/Compass Sensors ¦  Replies: 11 ¦  Views: 1120

fkatzenb wrote: Thoughts?
You know, I completely misread your OP. I thought you were interested in angular position only, regardless of any Z displacement. :doh: (thinking...)

Re: 9V switched mode power supply & relay from 110 VAC outle

 by elevator4 ¦  Thu Feb 07, 2013 6:16 pm ¦  Forum: SparkFun Product Questions ¦  Topic: 9V switched mode power supply & relay from 110 VAC outlet. ¦  Replies: 1 ¦  Views: 378

Hi,
depending on idle/peak current consumption:
through a capacitor-rectifier-zener, or a chip like power integration's ICs (www.powerint.com)
-E

Re: PowerScope

 by elevator4 ¦  Wed Feb 06, 2013 7:08 am ¦  Forum: MSP Microcontrollers ¦  Topic: PowerScope ¦  Replies: 4 ¦  Views: 2782

Neat!

Re: Real World Mag/Compass Sensors

 by elevator4 ¦  Tue Feb 05, 2013 2:07 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Real World Mag/Compass Sensors ¦  Replies: 11 ¦  Views: 1120

Hi, I assumed the magnet was never going to be 100% perpendicular. You can also do it with discrete components: An LC relaxation oscillator, frequency changes with field force. At any rate, at some point I'd do some real-hardware testing. Check these out (unfortunately, "coming soon"): http://www.al...

Re: Real World Mag/Compass Sensors

 by elevator4 ¦  Fri Feb 01, 2013 5:40 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Real World Mag/Compass Sensors ¦  Replies: 11 ¦  Views: 1120

Frank, assuming your sensors are able to resolve both field polarities, two (X and Y) would suffice. Imagine rotating the sleeve through 360 egrees: The X sensor will give you a reading proportional to cos(angle), while the Y will give you sin(angle). by these two measures (the relation between the ...

Re: Capacitor as a timer

 by elevator4 ¦  Tue Jan 29, 2013 4:43 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Capacitor as a timer ¦  Replies: 2 ¦  Views: 454

Hi,
here's a nice page on calculating the required capacitor given current draw and time-to-discharge. Enjoy,
-E
http://www.elna.co.jp/en/capacitor/doub ... ation.html

Re: Can't find an answer

 by elevator4 ¦  Tue Jan 29, 2013 4:38 pm ¦  Forum: Arduino ¦  Topic: Can't find an answer ¦  Replies: 4 ¦  Views: 565

Hi, You can always try :) but to somewhat level out the differences in Vf I would at least use (for an 8x8 matrix) 8 resistors at the cathodes and 8 at the anodes, then tie all the cathode R's together, same for the Anode's. Calculate the Rs to provide current for 8 parallel LEDs each (eg 20mA*8=160...

Re: headphone wire into wireless

 by elevator4 ¦  Tue Jan 29, 2013 1:51 pm ¦  Forum: Wireless/RF ¦  Topic: headphone wire into wireless ¦  Replies: 1 ¦  Views: 361

Hi, if you are looking for a small form factor (read small batteries), nothing beats FM radio. Unfortunately, in the past cheap transmitters (most were based on a crappy transmitter IC from Holtek) have given the solution a bad name. More recently however, ICs have been developed with far better sou...

Re: power rail help

 by elevator4 ¦  Thu Jan 24, 2013 2:59 pm ¦  Forum: PCB Design Questions ¦  Topic: power rail help ¦  Replies: 8 ¦  Views: 1276

The p-fet should work. What sort of isolation are you looking for?
There are also ICs for the purpose, eg TI TPS2111
-E

Re: Trying to make a tiny, wearable, simple button to log da

 by elevator4 ¦  Thu Jan 24, 2013 7:06 am ¦  Forum: SparkFun Product Questions ¦  Topic: Trying to make a tiny, wearable, simple button to log data ¦  Replies: 5 ¦  Views: 533

Wow, that would be really great! Please let me know how much you want for one? I don't know. I'm more concerned with the development setup you'd need. Here's what I am using: - the final coin battery is not mounted on the logger at that stage: first, to allow measuring current draw. Second, to save...

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