I spent some time this evening revising TinyTimer Duo. I made both relays capable of handling AC loads. I also added a second input, and switched the chip in the design to an Atmega328p-PU which is the same as what is in some types of Arduino boards. This makes it fully compatible. The inputs are on the A/D lines which makes them useful for more than just simple switches. Each input sources 5v and is protected by a resistor.
Here is what the prototype board looks like. It’s approximately 4×2. It’s a little more spacious then some of my other designs.