Catalina 30 TRBS #2889 "Northern Light"

Wireless remote control for ST4000+ autopilot

This system is a handheld Tx unit and stationary Rx unit. It's based on a pair of microcontrollers and a pair of 433MHz radios.The keypad/transmitter is on the left. It consists of a PIC16F628 microcontroller, Parallax 433MHz transmitter module ( and antenna, and membrane keypad built into the plastic box. It's powered by a 9V battery. Power saving firmward allows it to run continuously for several months...there is no power switch. The receiver is on the right (above.) It consists of a Parallax 433MHz receiver module and antenna, PIC16F628 microcontroller, and Seatalk interface components. Schematic and firmware details are below.

#27980 Transmitter #27981 Receiver
(Photos are from the Parallax web site)

The keypad is covered by label material obtained from The keypad image was created in Word and printed on a laser printer.