Hi Paul,
Yes small world.
But in the end we meet again.
Some one else building a modelcar dyno has chimed in on my project.
He already said that the DATAQ will not perform the job.
He also tried Serial but is now measuring torque by strain gauge and parallel port.
For your inertia drum this is not usable.
I like to use the inertia disk to keep all simple to rebuild.
The dataq 148 can still be used to measure all analog signals as this is what I intend to do.
I was told the pc clock would be sufficient to produce data.
Cant you measure the wobble of the pc clock and take that in the freq calc?
I was advised to measure 20 to 30 revs measure start and end time and use the average as RPS. With high speed clock this would be the best possible and still have reasonble accuracy for RPM collection.
QueryPerformanceCounter Lib "kernel32" (x As Currency) As Boolean
QueryPerformanceFrequency Lib "kernel32" (x As Currency) As Boolean
These API's can be use to determine timestamps and frequencies.
You can also calcualte the differences due to the API calls according the MSDN page
https://support.microsoft.com/kb/172338
I am struggling to program in VB although I get some help.
The mechanics are no problem and also the sensors are working 100%
Quited to use the cheap F/V conveter by LM2417.
Keep in touch,
Paco