Another reason that you don't have phase issues is that the LEDs are not coherent sources. If you had laser diodes as your sources you COULD have phase issues, although if the lasers are not phase-locked they would likely drift enough relative to each other that the interference pattern would change much faster than the data rate. On Mon, Oct 17, 2016 at 3:10 PM, Neil wrote: > Hi Josh, > > Was not aware of remotes that had multiple LEDs. Considering the low > data-rate I don't expect issues, but perhaps there's something I'm not > thinking of here. > The emitters have a 90-deg angle, and the IR receivers also have a > specific receive angle (also 90 deg). Splitting the emitters apart will > keep the receiver's angle lower, and is not really much more work to do. > But I'm also considering multiple emitters all together, but raised > higher to reduce the angle to the cars. > > This blog has more info on the whole setup... > https://teejaydubblog.wordpress.com/ > > Cheers, > -Neil. > > > > On 10/17/2016 2:47 PM, Josh Koffman wrote: > > Hi Neil, > > > > There definitely used to be TV/VCR remotes with multiple IR LEDs in > > them. Given the speed of light I'm not sure you'd have phasing issues > > if the sources weren't close together, but if you can get the coverage > > you need with a small array all in one location, won't that make > > building it easier too? > > > > Josh > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .