A lawn sweeper for collecting debris from a surface includes a frame. The part of the inner face of the front plate delineated by the seal is coated with a polymer film presenting a refractive index comprised between that of the front plate and that of the antireflection layers of the photovoltaic cells, said film being in contact with the photovoltaic cells. The systems and methods further allow for a determination that a consumer electronic device is connected, the type of device that is connected, and the type of signal format that is being utilized for the transmission. A second source of radiation and a second camera preferably provide additional images of the wafers from a different angle. The receiver performs iterative decoding in the first and second logical dimensions until either i) all errors are identified and corrected or ii) another type of stopping condition is met.