LED Optical Data Link Shield for Microcontroller

I am looking for the design of a simple optical data link using LEDs and photo-detectors to transmit data from one microcontroller to another. The final deliverables for this project will be: 1. Schematic design for the transmit and receive parts (these are just shields so you do not need to include the microcontroller schematic) 2. Software to transmit and receive data (including error detection/correction, can be for any microcontroller but needs to be in C++) 3. Demonstration that your software and hardware works e.g. you need to build a breadboard prototype and show it working and transmitting data (I will pay for the components) 4. Key measured parameters for your design: range, maximum bit rate, power consumption, etc. Engineering trade-offs: 1. Range is more important than bit rate. 2. This is a one way link, not bi-directional, so one side is transmit-only and the other side receive-only. 3. You can assume that the receiver will be pointed at the transmitter so it does not need to transmit in all directions, however I will need to know how far the two can be miss-aligned before the link fails. 4. This will be battery powered so power consumption is important. 5. The supply voltage will be DC from a battery. However I am not specifying a particular supply voltage so you can define that as part of your design. 6. If you use anything open-source it must allow commercial rights, and you cannot use anything patented. A very basic high-level diagram is attached. To allow me to select the right person for the job send me a brief description of how you will approach the work, perhaps some thoughts on the transmission protocol to use, or choice of components to meet the spec, etc. How long it will take you to finish everything. Also include a key parameter list, what range and bit rate you think will be possible. You can also mention any similar projects you may have done. Show me you have thought about the problem and design and have an idea how to approach it. As usual you will need to agree to assign all rights to your design to me and not use it for any other project, commercial or otherwise.