12-20-2014 06:57 PM
12-22-2014 01:51 AM
Hi,
The specification of the 9402 says; 'Input high, VIH ...........................2 V min' so with 2.2V it just might work.
You say '~2.2V' which tells me that it is AC. Since it is PWM assume it is DC.
You could also use a resistor divider to get a 5V signal. With a resistor of 4.7k and 205k in series you have a 4.9V signal over the 4.7k resistor.
Kees
12-24-2014 09:47 AM
12-24-2014 09:48 AM
12-25-2014 03:41 AM
As far as I know the voltage of the digital input is not adjustable.
I think the easiest solutions are:
-1-
Use a daq with a analogue input and the 1:100 divider you have.
-2-
Built your own divider but less dependent of the input voltage. I think this can be done with a few resistors and a zenerdiode.
Kees
12-29-2014 07:59 AM
Another option is to use a comparitor chip. You can set your own threshold level and the output of the comparitor is a true TTL level.