If your project only needs to transmit data at a certain frequency, then a simple RF transmitter is perfect. Pair it with a receiver of the same frequency and you're set.
SKU: WRL-10534| Brand: SparkfunThese wireless transmitters work with our 434MHz receivers. They can easily fit into a breadboard and work well with microcontrollers to create a very simple wireless data link. Since these are only transmitters, they will only work communicating data one-way, you would need two pairs (of different frequencies) to act as a transmitter/receiver pair. Learn More$5.77 AUD, inc GSTAUD, inc GSTdelivered by
Wed 26th of Sep$5.77 AUD