[ML-General] PhreakNIC badge materials group buy!

[James Fluhler]

Also keep in mind the nature of IR and issues( or potentially benefits) of blockage / alignment, due to LOS restrictions. You will want to keep the data size minimal, and ideally wrap the data in some error correction scheme. Still though for straight forward stuff like sharing an email address or phone number pretty effective. 



> On Oct 3, 2017, at 9:54 AM, Brian Oborn <linuxpunk at gmail.com> wrote:
> 
> Note that I looked into the IR receiver chip on the Playground Circuit Express and it's designed for IR remote control protocols (like for your TV) and as such has a very low bitrate. Using established IR protocols it would be around 500bits/s and if you hacked up your own protocol you might be able to get to 1000bits/s. Unless you changed the hardware (hook the IR receiver directly to the ARM's ADC?) you're not going to get much better than that.
> 
> Here's a reference on the NEC IR protocol for an example protocol: http://www.sbprojects.com/knowledge/ir/nec.php <http://www.sbprojects.com/knowledge/ir/nec.php>
> And here's a link to the datasheet for the receiver preamp: http://www.vishay.com/docs/82748/vsop383.pdf <http://www.vishay.com/docs/82748/vsop383.pdf>
> 
> Just throwing out the design constraints before people get too excited about IR applications.
> 
> Bobby Tables
> 
> On Mon, Oct 2, 2017 at 11:12 AM, Hunter Fuller <hfuller at pixilic.com <mailto:hfuller at pixilic.com>> wrote:
> Gang,
> 
> shapr and I think it would be neat to make our own electronic badges for PhreakNIC this year. We've settled on a recently-released platform from Adafruit, the Circuit Playground Express. This platform has IR communication, so we'd like to focus on in-person interaction between badges. (His suggestion was to show matching interests based on LED color, but the possibilities are endless.)
> 
> If you want one, it's going to cost $30. The default package will be this one:
> https://www.adafruit.com/product/3517 <https://www.adafruit.com/product/3517> 
> 
> So, you'll get the board, battery box, batteries, and belt clip.
> 
> If you prefer to use a Li-ion or Li-ion polymer battery, and you already know how to charge one of those, please email me separately. I can buy you the board for $25, and I'll also buy you a battery if you need one (I recommend this battery https://www.adafruit.com/product/1578 <https://www.adafruit.com/product/1578> as it'll fit behind the board while you're wearing the badge).
> 
> The order will be placed on Wednesday - that is TWO DAYS from now. PayPal or Square Cash me $30 at this email address and you'll get in on the fun! You don't have to hack the badge if you don't want to - you can always just let me or shapr download some fun code onto it for you. We promise there will be lots of blinking, and some optional beeping.
> 
> Cheers!
> 
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