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Author Topic: Arduino mini pro ATmega 328 3.3V inputs PWM voltage 5V  (Read 1099 times)
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 Hi guys, I am a complete newbie in the microcontrolers field and I have a question that might sound newbie to you but is important to me. I have an Arduino mini pro ATmega 328 3.3V board and I have chosen it because I have to read the signals from a Hall magnetic sensor IC EM3242, whose maximal power voltage rating is 3.3V. My problem is that I don't know whether this board will be able to read the RCreceiver PWM signals, whose maximum voltage is 5V, without damaging the Arduino board.
Thanks in advance! 
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Where does  the 5V signal come from?
ATMega at 3.3V will be damaged if the IO is driven at 5V levels.
At a minimum, need resistor voltage-dividers to bring the 5V down to 3.3V.
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Thank you very much for the response.
The 5V PWM signal comes from a radio control receiver (RC hobby RX-receiver, TX-transmiter 2.4GHz system).
 
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