Min high input voltage (Arduino Micro)

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1

Hi all!
I'm using the pulseIn() function to read a PPM signal through an Arduino Micro. The problem is that the Arduino Micro operates at 5V whereas my PPM signal goes from 0 to 3.3V. Will the Arduino Micro detect 3.3V as a high level? I couldn't find these specifications in the Arduino website. So, what are the limits for high level on the Arduino Micro?

Thanks in advance.

2

You should be fine..... 3.3v should read as high.

3

Datasheet says Vih 2.7 = 5.5V.

4

The '32U4 processor datasheet says for Vcc from 2.7V to 5.5V, the minimum "Vin high" is 0.2 x VCC+0.9V.
So with 5V: 0.2 x 5 + 0.9 = 1.9V
So 3.3V is fine as a high.

5

Thanks for the answers. I've just found the same as "CrossRoads" has said. Vin high = 0.2 x VCC+0.9V.