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What's the cheapest way to link a few microcontrollers wirelessly at low speeds over short distances

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What's the cheapest way to link a few microcontrollers wirelessly at low speeds over short distances.

I'm looking to keep it ultra-cheap, use common discrete parts and keep it physically small. I don't care about bands and licensing so long as it works.

802.15.4/ZigBee, Bluetooth and WiFi all require an expensive coprocessor, so aren't an option.

Alternatively, are there very cheap radio modules available to hobbyists? The kind of things you find in car keyfobs and wireless thermometers, perhaps?

Would building a simple transceiver on a homebrew PCB even be practical, or will I be plagued by tuning, interference and weirdy analogue stuff?

Could something like this be driven from a microcontroller? http://www.kynix.com/Product/Cate/35.html

What about receive?
asked Jul 28, 2016 in IEEE 802.11 (Wi-Fi) by jecci New to the Community (0 points)
recategorized Jul 28, 2016 by michaelt
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2 Answers

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answered Jul 28, 2016 by michaelt Veteran of the Digi Community (758 points)
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The problem with what you are looking for is that you would still be required to pass FCC or other regulatory approvals which are very costly. Up around 10K. Instead, using a simple UART connection to send and receive data wireless can be done using the XBee 802.15.4 modules relatively cheep.
answered Jul 29, 2016 by mvut Veteran of the Digi Community (11,300 points)
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