which rf module to use?

Projects Networking, Protocols, and Devices
1

hi,
i need to receive one English alphabet at a time from a vb.net application on computer.
obviously it is possible right now through the rs232 serial ports on both my laptop and my Arduino board.
i was wanting to know which rf module should i use in order to achieve the same functionality.
thanx.

2

i was wanting to know which rf module should i use in order to achieve the same functionality.

Any of them, if your goal is to send one letter a day, 3 inches, and it's OK that the character gets mangled occasionally.

If you have different range, speed, and/or reliability requirements, the answer could (will) be different.

3

PaulS:
If you have different range, speed, and/or reliability requirements, the answer could (will) be different.

range: 10 meters (minimum)
speed: 80 bps (minimum)
reliability requirements:

  1. i cant afford to lose a single bit.
  2. i cant afford to get the bit sequence mangled.
4

Have a look at Xbee modules, well supported by the Arduino community.

5
  1. i cant afford to lose a single bit.

Then, you can't afford wireless.

6
  1. i cant afford to lose a single bit.

that translates to:
it would be preferable not to receive gibberish most of the times.

PaulS:
Then, you can't afford wireless.

that is so not true. even if i meant what i said literally.

anyway,
lets refine it.
i could not get my hands on xbees
so got cc2500 series 2 rf modules by robosoft systems instead
had a real experience with them
first they were too resistive to interfacing then to communicating
i tried pc to pc only to discover they are sending utter gibberish to each other and that too not all the time
ive spend a good amount of time and resources and do not wish to repeat the process
i have tried, re tried, re retried making them work, they dont want to, simple.
i am now looking at link rf modules or their likes
433 mhz
100 m range etc
will they solve the purpose?

Bajdi:
Have a look at Xbee modules, well supported by the Arduino community.

thanks, i know
that was the intent
the problem is now they are seemingly expensive here
cant get into it right now.
maybe the next project.

7

An excellent low cost solution with up to 2Mbps throughput and 50 to 70m range is the nrf24l01+ transceiver. Check them out.

8

dhunt:
An excellent low cost solution with up to 2Mbps throughput and 50 to 70m range is the nrf24l01+ transceiver. Check them out.

looks good..
thanks