I want to connect a 433MHz RF receiver running at 5V to an Arduino running at 3.3V, or do I have to build a resistor / diode clamp. Some (PIC) MCUs have 5V tolerant input pins but I'm new to AVR & Arduino's. Bonus question, are any inputs better suited to capture? e.g. IR or PWM (on PIC it's calle…

Are any ATmega328P input pins 5V tolerant when VCC is 3.3V?

system October 6, 2012, 4:56pm 3

Thank you. I guess the choice is a 100ohm resistor & Schottky diode clamp to 3.3V or a 3.3V 433/315 MHz module.

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