Want to monitor motor current using Motor Mind C and BS2

Nick Fox

Hi

I want to monitor the motor current of a pittman 24V dc motor using the motor mind C and the Basic Stamp 2. I then want to display this in Labview using one of the real time display graphs. The part that I'm having trouble with right now is

a) figuring out a circuit to monitor the current
b) getting the current measurements into the basic stamp

thanks for your help
Nick

metron9

You are using the motor mind C to control the motors is what I think you are saying and you want to monitor the output current of that controller.

It would seem to me, and I am new to all of this, but from what I know about RC circuits could you tap into the current flow to charge a capacitor for say 1 mS and then time the decay from logic 1 to logic 0 on a stamp pin using rctime command? The higher the current the longer the RCtime.

Using a transistor to switch the current to charge the capacitor from one pin on the bs2 and reading the rctime with another pin should do it nicely.