http://www.miniinthebox.com/mtdz006-rf- ... 473289.htm
having done this before (on a different micro, and analog) I don't see any problem. You may contact me via PM.
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...
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.
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...)
depending on idle/peak current consumption:
through a capacitor-rectifier-zener, or a chip like power integration's ICs (www.powerint.com)
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...
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 ...
here's a nice page on calculating the required capacitor given current draw and time-to-discharge. Enjoy,
http://www.elna.co.jp/en/capacitor/doub ... ation.html
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...
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...
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...