If the OP could live with digital outputs for the photo transistor levels, then you could just use I/O expanders. Comparitors would be cheaper than analog switches. Some I/O expanders can read 26 I/O pins with one package.
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If the OP could live with digital outputs for the photo transistor levels, then you could just use I/O expanders. Comparitors would be cheaper than analog switches. Some I/O expanders can read 26 I/O pins with one package.
Tim Barr
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