Enter the nRF24L01 2.4 GHz wireless chip from our friends at Nordic
Semiconductor. This chip was released a few years ago and is the successor to the
popular nRF2401 series of chips. The 24L01 takes all of the good features of the 2401
and adds a true SPI interface, hardware link layer, multiple pipelines, and more. Plus, the
chip is cheaper than your average microcontroller, and it doesn’t require too many
external components.