should Vin be discreet from Vdd?

Yes.
Vin is the BMS trigger signal.

haven't done anything with pin4....

Why?
They need to be connected as shown.

I'm also using NE555P (TI), will this work with the RC values given?

Yes.

I could also be missing something with the transistor inverter?

Can't tell without a schematic.

 

I get a pulse only when i pull it back down to 0v. am I missing something?

No.
A 555 one-shot operates when the TRIG input momentarily goes from high to low.

 

Thanks for the feedback, much of what I was missing became apparent to me in the middle of the night when I should have been sleeping. I think that I was missing the idea of how I should be thinking of the BMS as pulling down to generate the trigger and that I didn't have that worked out with my improvised transistor inverter. I'll work on it some more this weekend and my CD4049UBE will be here on monday Thanks again, do you get tired of working these things out with us rookies?

 

do you get tired of working these things out with us rookies?

Nope.
It gives me something interesting to do.

 

Nope.
It gives me something interesting to do.
with respect to pin 4 "reset" and the logic drawing; the little arrow shaped box (plug symbol?) connects both pin 4s together?

 

with respect to pin 4 "reset" and the logic drawing; the little arrow shaped box (plug symbol?) connects both pin 4s together?

Yes, any circuit nodes with the same name connect together.

 

Yes, any circuit nodes with the same name connect together.

Thanks what’s a good source to learn the circuit symbolology and perhaps what is your circuit simulator?

 

what’s a good source to learn the circuit symbolology

One of these references should help.

what is your circuit simulator?

I, and several others on these sites, use the free LTspice simulator form Analog Devices (formerly Linear Technology).
It's one of the best free analog simulators available.
It's learning curve is a little steep, but there are good tutorials available, and numerous example circuits to help you get started.

 

One of these references should help.
I, and several others on these sites, use the free LTspice simulator form Analog Devices (formerly Linear Technology).
It's one of the best free analog simulators available.
It's learning curve is a little steep, but there are good tutorials available, and numerous example circuits to help you get started.

yeaaah! I've got a working mock up thanks again, chipper

 

yeaaah! i've got a working mock-up, thanks again!

 

Hi, finished building the first version of the circuit, and I found that it works as planned except for one detail. I had to add 100k resister between the input and Vcc to get the circuit to pull-up completely. Is there something i missed in the input wiring?