Micrel has created a PS/2 wireless keyboard reference design incorporating the MICRF003 QwikRadio receiver used in conjunction with Microchip PIC16C72 microcontrollers. This page provides everything required to implement a wireless keyboard including the microcontroller firmware. Overview Transmitter The transmitter consists of a Microchip PIC16V72A-10/SP-ND microcontroller driving an RF Monoliithic (RFM) HX2000 transmitter module. The HX2000 module is connected directly to a simple wire antenna. Power comes from a 4-cell battery pack via Micrel MIC5205 linear voltage regulators. The PIC microcontroller is clocked by a Connor-Winfield CW421-ND quartz crystal. Receiver The receiver has a MICRF003 receiver connected directly to a simple wire antenna, data out of the MICRF003 is processed by a PIC16C72A-10SP-ND microcontroller. The microcontroller clock and the MICRF003 reference oscillator source are both provided by a Connor-Winfield CW421-ND in conjunction with an ICS ICS525 configurable clock. The IC525 routes a 10MHz clock to the microcontroller and the required reference oscillator frequency to the MICRF003. Design Resources Schematics PDF Format Datasheets MICRF003 RF Receiver PIC16C72A Configurable Clock MIC5205 CW421 Crystal CUI Stack PS/2 Connector Firmware Transmitter firmware (rev. 6) Receiver firmware (rev. 6) PCB Layout Receiver board PDF Transmitter board PDF Gerber files - soon