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ariakovo said:I don't have space and the cost of a PIC is to high for this application. I have use ir receivers modules but i had the problem that you say. I had to send some data so. I beleve that an ired , a phototransistor and an applifier.Or and ired that send a frequency in 30KHz a phototransistor a band pass filter and an applifier.What do oyu think?