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AVR1005: Getting started with XMEGA
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... ADC conversion and an input capture on the Timer/Counter to get exact time-stamps for each conversion. Yet another example could be to let an event trigger ADC conversions to sample music from a microphone. At conversion complete, the DMA copies the result(s) to SRAM. When the user presses a switch, ...
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Opto-isolator



In electronics, an opto-isolator, also called an optocoupler, photocoupler, or optical isolator, is a component that transfers electrical signals between two isolated circuits by using light. Opto-isolators prevent high voltages from affecting the system receiving the signal. Commercially available opto-isolators withstand input-to-output voltages up to 10 kV and voltage transients with speeds up to 10 kV/μs.A common type of opto-isolator consists of an LED and a phototransistor in the same opaque package. Other types of source-sensor combinations include LED-photodiode, LED-LASCR, and lamp-photoresistor pairs. Usually opto-isolators transfer digital (on-off) signals, but some techniques allow them to be used with analog signals.
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