DTMF Link Controller Version 2

This is my second version Link-Repeater Controller. This version has lots of features.
It can work two-way. A->B or B->A.
Can measure battery voltage. If you make external connections to ADC ports, temperature, SWR or any other DC voltage can be measured.
My plan is to add RTC and modem to this board. So I can use time based passwords for control and easily read-set parameters.
The relay which is triggered 10 times in a minute when you are sleeping is very annoying.
So, I can say something like "between 23:00 and 06:00 raise squelch level and use ctcss".
I haven't tested my software for longer periods so you may need to code your own.
There are lots of empty pins for your imagination.
I printed the top silk on regular A4 in mirror view and ironned it on the board.


Correction: There is a missing ground on the trimpot, you can use small jumper to the near ground plane.


Layout File