Key design features:

- Dedicated HC-05 port

- ATTiny2313 with socket for easy replacement

- Breadboard compatible headers for access to all pins

- AVRISP interface

- Reset switch

- RX/TX LED's to show when data is being trancieved

- Power on LED

- Micro USB plug for power supply (d+/d- pins are nc)

Next steps:

Write firmware for the ATTiny and a Python script with a GUI for remotely controlling ATTiny functions such as PWM and pin toggling.