Im litterally just trying to do three things.
Unit one controls a pump with a temp sensor. Unit two has an LCD and speaker and two switches.
Im trying to send the temperature from unit one to unit two so I can display it on the LCD. I also want unit one to be able to tell unit two when to turn the speaker on. Finally unit two needs to be able to send a signal to unit one to turn the pump on.
Im not even sure what SPI is so I will need to look into that. Ive also been recommended this module:
SparkFun Electronics - Transceiver nRF24L01+ Module with Chip Antenna