Interface between an Icom AT-130 and a Codan Radio

So I only need to build a single interface for my VX-1700, I'm standardising on the Codan 9350 signalling. This means I need to convert the signalling from my AT-130 into the same format that Codan use.

This has a side benefit - I'll be able to use my AT-130 directly with an old Codan radio I have. Neat.

Hardware

This is designed in Upverter - feel free to fork the project if you like. The link is here: Upverter Project

IO

From the Codan radio:

• TUNE = Input and output (normally pulled to +5 from the Codan)
• IND = Input to the radio (normally pulled to +5 from the Codan)

From the AT-130

• Start = Start tuning (normally pulled to +5v from the AT-130)
• Key = Send CW to me please (open collector, using the internal weak pullup resistor)

Software

Software is in the repo - it works but needs some enhancements:

• Add some kind of timer/counter while in a tuning cycle - if it takes more than 10 seconds, stop trying and indicate a fault to the Codan
• Remove the debugging serial stuff
• Add better signals on the LED to indicate pass/fail conditions
• Change the pin numbers in the #define statements to suit the ATTINY85