I'm working on a project that involves 8 peristaltic dosing pumps. I combined 2 Jebao DP-4 modules into a single 8 head module, but the mounting plate that came with each unit was just too convenient to discard, and it also has an green LED per each pump that I'd also like to work into the project.
As it stands now, I picked up 4 TB6612 dual motor control circuits from Sparkfun, but now I'm thinking a transistor (TIP120?) and a diode (1N4001?) would be more appropriate and safe for the project, and require less Arduino pins. The pumps run on 12 volts, and included with the master pump unit was a 12VDC/2A wall wart, and no added power source came with the slave unit.
My question is can I safely incorporate the LED into each motor circuit? Like +12v/motor/LED/driver circuit/ground? If the outcome is simply just decreased motor RPM, I can live with that. When the motor is switched on, I would also want the LED to switch on from the same transistor.
Also, I am open to suggestions about what to use to drive the motors. I've read N channel mosfets would be good too, but I didn't take notes as to which model number would best work for this and found the TIP120s being used in other threads and videos the same way.