pulsin with BS2

Archiver

My project is to eventially read a PWM signal from sensors on an
engine and determine the duty cycle, then convert to a 0-10 volt
signal. The sensor out puts a 500 hz frequency.

For starters, I'm trying to test pulsin with my Scopes test pattern (
0.5 vpp @ 100hz 50% Duty Cyle).

The BS2 never sees the pulses. I'm using the Duty Cycle test program
from the Stamp Book. Is the voltage too low on the pulse?

Thanks for any help.

Archiver

0.5 vpp is too low for a BS2 to read. Even using a Schmitt Trigger
TTL/CMOS the positve-going threshold is typical 2.0v. You need to
amplified it using transistors.

- Johari



--- In basicstamps@yahoogroups.com, "skinner02001" <skinner02001@y...>
wrote:
> My project is to eventially read a PWM signal from sensors on an
> engine and determine the duty cycle, then convert to a 0-10 volt
> signal. The sensor out puts a 500 hz frequency.
>
> For starters, I'm trying to test pulsin with my Scopes test pattern (
> 0.5 vpp @ 100hz 50% Duty Cyle).
>
> The BS2 never sees the pulses. I'm using the Duty Cycle test program
> from the Stamp Book. Is the voltage too low on the pulse?
>
> Thanks for any help.