The IK1ZYW Keypad for FT-817(ND) is a wired partial remote control for the little Yaesu transceiver.
It was conceived during a 6-hour field session at 2700 m.a.s.l. for a VHF contest in August 2008 (full history in the User's Manual). Since existing products did not meet my requirements, the development of an external keypad started right away.
I have come up with a public hardware design using the powerful Atmel ATtiny2313 microcontroller and a freely available firmware.
And there is a version for FT-857 and FT-897 too!
The Interactive Frequecy Reader is an extension of the keypad with a visual feedback through an LCD display. This accessory is based on Atmel ATmega series and HD44780 LCD display (16 chars on 2 lines).
The IFR is supposed to work seamlessly on FT-817, FT-857 and FT-897. It also supports the math for operators of microwave transverter. See the More Info page for an in depth review of this accessory.
As usual, the full circuit diagram and a basic firmware will be free.
The Frequency Reader is a no-frills device that allows you to have a frequency readout far away from the radio. It is based on Atmel ATmega and HD44780 LCD display (16 chars on 2 lines).
You can choose between a fully featured firmware showing signal strength (and few other settings) and a special firmware for use in conjunction with microwave transverters. The Remote Display works on FT-817, 857 and 897.
As usual, the full circuit diagram and a basic firmware are free.