Wireless voice transmit and receive is not something you see used in many projects, normally this would be an entire project in itself. The helpful shortcut is to make use of pre-existing modules to get the job done, the SA828 Walkie-talkie module made by NiceRF will do just what you want.
The great thing about these modules is you can embed them into any project easily. Run them off battery power or from a wall wart. Having easy access to the audio input and audio output pins on the module opens up some interesting project ideas. For example you could speak into one Walkie-talkie, and have the output of the other Walkie sampled by something like a microcontroller or a Raspberry Pi to give your RC robot an unhuman voice. You could also do cool things with this like voice recognition and so on.
The output power of these modules is 1 Watt in the 400-480Mhz band which gives you 3km of range in open area. Various parameters can be changed by connecting the module to a computer via the supplied USB-to-serial converter board. Volume control is achieved by soldering on a simple variable resistor.
What would you make with a Walkie-talkie module? Tweet us @tindie