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Topic: Arduino mini pro ATmega 328 3.3V inputs PWM voltage 5V (Read 1 time) previous topic - next topic

chaika


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! 

CrossRoads

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.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

chaika

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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