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I have an optical sensing system that uses three LEDs (LED1, LED2 & LED3) as transmitters. The lights from these LEDs are detected by three Photodiodes (PD1, PD2 & PD3). The signals from the PDs are passed through an Analog Circuit that is common to all. Then the analog output is passed through three different digital circuits Dig1, Dig2 & Dig3 for indication. At present, I'm using only one sensor at a time (LED1->PD1->Analog->Dig1) by manually chnaging the connections. I would like to have a system that will keep LED1->PD1->Analog->Dig1 ON for 30 secs, then turn it OFF, turn LED2->PD2->Analog->Dig2 ON for 30 secs, then turn it OFF, turn LED3->PD3->Analog->Dig3 ON for 30 secs and then turn the whole system OFF for 10 mins. 10 mins later it will do the same cycle again. Is there any way to do that? I need to do this to save the battery and also to use only one Analog Circuit.