1-year life with a CR2032 (at ~200mAh/3V) seems to me utopia, but I may be wrong. Vasile On Tue, Aug 11, 2015 at 10:09 PM, Neil wrote: > Okay, so more data on this... 433 Mhz is out, because the customer > really wants to use this from a smartphone. I've looked into other > things like mesh networks and all avenues point to $3-5 for a full node > (each node being a self-contained unit with it's own battery, and > bidirectional comms and LED). They would like a 1-year life with a > CR2032, but I did the math on that and sent them off with a realistic > estimate of battery-life, cost, and size, and see if they want to pursue > this any further. > > Thanks, > -Neil. > > > On 8/2/2015 11:23 PM, Bob Blick wrote: > > Hi Neil, > > > > Be aware that in the US, 433 MHz is not an ISM frequency so you have > > tighter restrictions on power, amount of time you can use it, and > > regularity of transmission/repeating transmissions. Don't let that scar= e > > you off, but if you're planning on a product, check the rules before yo= u > > lock in. It's a shared band and unlicensed use is quite restricted. For > > starters, think 1 milliwatt if you're using a real antenna, transmittin= g > > no more than one or two times a minute, and not regularly, you need to > > add a random component, not a fixed schedule. > > > > Bob > > > > On Sat, Aug 1, 2015, at 06:42 AM, Neil wrote: > >> Hi all, > >> > >> Alternate plan to the bluetooth project -- anyone have a recommendatio= n > >> for a small simple (and low-cost) short-range RF receiver? It would > >> need to operate very low power, and detect a simple code (say 16-bit) > >> from a transmitter. I can toss a small PIC10F behind it to do the > >> decoding if it does not have the capability. > >> > >> I've considered an rfPIC, but volume pricing is only down to US$2.xx, > >> and I'm hoping to find something much lower cost. Since I can find > >> 433Mhz receivers (assembled circuit on a PCB with the supporting > >> jellybean components for $2.95 retail), perhaps I can hope for under $= 1 > >> for the receiver? > >> > >> Cheers, > >> -Neil. > > > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .