People Counter - Raspberry / Arduino - repost

I need a people counter tool prototype to be designed and manufactured. The aim of the tool is to count how many visitors are in the room and record this data over the web in a MYSQL database. - The tool should have 2 sensors (IR) to make sure, that bi-directional counting is available. (e.g. [login to view URL]) - Recommended configuration: Arduino to operate the leds, connected to a Raspberry to handle the webtraffic over wifi. - The data should be recorded in a MySQL database. Every entry should have a record: Incoming: timestamp;IN Outgoing: timestamp;OUT. - At the End of the day visitor number should be 0-ed. No housing, no beautiful case is required, just really the frame wired, but working tool. Write in your application how you would connect the Arduino Board or the Raspberry (or why would you use just one of them), otherwise your application will be ignored.