need transeivers for system development

[T. Rooks]

Hello,

Please be gentle. This is my first time;) .

I am a retired computer/medical electronics/electromechanical device field engineer.

A friend got me interested in developing an idea he had. It involves having various separate units performing precise high speed operations in a time and security critical network.

I have developed several modules and have them working as intended in a 'hard wired' ring topology configuration. What I now need is to get them converted to wireless using as small packages as possible to get no less than 100 meters range in the outdoors. They must also have an operating temperature range of -50 to +85 C. They will spend most of the time waiting for very short transmissions and will respond with very short transmissions.

I am prepared to develop my own protocols for them to sync up and accept commands/data to and from each other as I already have a rudimentary system doing that task. However I would not mind modules that have embedded 16/32 bit processors if I can get documentation and be able to use Basic or C programming and if it can add an extra level of security with minimal time overhead.

Any and all recommendations, suggestions or ideas will be greatly appreciated and acknowledged.

Thanking all in advance for your help,

Tim

[Brian]

Wow Tim, looks like you have quite a beast to tackle! These don't have the ideal included MCU, but I've just been playing with the nRF24L01+, and they can handle almost all of the protocol for you. A poke around the datasheet will give you a great idea of how useful they will be to you. With two-way payloads, one could easily keep these time-synchronized, and a decent antenna (biquad, perhaps) would increase the range, as well as choosing an open 2.4 GHz channel, but it may require amplification to get your 100 meters. I'm not sure of the true limits of their range, that's up to testing.

I've not done anything of the standard you've described, this is just where I would start out of the gate. Good luck!

-Brian