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By fll-freak
#165034
I am looking for a short range wireless solution to transmit a single bit of data. I am working with a team of kids on a project and they want a remotely sensed event to be trasmitted no more than 10 feet. Optical system is not possible as line of sight is broken. What might be the simplest and cheapest solution? A micro on both ends of the link would be available.

My current solution is the pair:
https://www.sparkfun.com/products/10534
https://www.sparkfun.com/products/10532

But I would still need to transmit bytes and to prevent false alarms and an ID code. Bit too much for elementary and middle school kids.

Looking for something like a key fob door unlocker for just a few dollars. Any ideas?
By waltr
#165041
The transmitter/receiver pair you linked to does require a processor at both ends of the link. This is to encode and decode the modulation to get reliable data transfer. Search the forums her for a number of discussions about using these parts.

How about one of these (all encoding/decoding is built in so very easy to use):
http://www.adafruit.com/products/1392
The transmitter button can be removed and wires solder on to trigger.

One bit of data (binary 0 or 1) or transmit bytes? Which is it?
By fll-freak
#165044
Thanks for the links. I will go off and read.

I just need to get a boolean sensor status from point A to B. So I just need one bit. But the reading I have done on many of these RF sensors is that you might need to send over an ID or something (along with your 'single bit') so that other transmissions at this frequency could be discarded.

-Skye
By waltr
#165051
The key-fob sender/receiver I linked to has all that built in. It actually does send an encoded address and key press data. The receiver decodes the address and then the data if the address matches.
These do have pins on the chip for strapping to a different address if you need more than one operating independently.