PPM Input

PPM Input

If you have a PPM signal that is higher than 3.3Volts you will need a voltage divider to reduce the signal. Otherwise you !Will! damage your BLE Nano 33.

For 5V PPM signal, R1 = (5*10,000)/3.3 - 10,000 = 5151ohms Round the value UP to the nearest commonly available resistor, which is 5600ohm or 5.6k

For 7V PPM Signal, R1 = 7*10,000/3.3 - 10,000 = 11,212 ohms ==> Rounded Up ==> 12,000ohm or 12 Kohm

It's better to have R value too big, this will result in a lower voltage on the output, which is okay as it will still be detected as a high level.

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