I love this device! This is a new version of the handler, with a semaphore to serialize the TX and RX functions, and the documentation has been improved and cleaned up. This is a basic handler for the Nordic nRF2401 2.4 GHz tranceiver. Modules are sold at various vendors (SparkFun, QKits, and others). The TRF24G.spin module handles the device, the NordicDemo.spin (and FullDuplexSerial.spin) are a simple test program to run the handler code.