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Thank you for watching. Using red LED sounds good. I'll try next time.There is no specs now.But how to build it is very simple.I recommend using this http://youtu.be/JkdIlp8UwZo (at 0:35)it use a transistor instead of microcomputer.Sensor is　here.http://akizukidenshi.com/catalog/g/gM-04267/ S-8120C(by SII)(unfortunately digikey have no) transistor is 2SC2712. You don't have to care capacitor/register type.