Hi,
I am working on a project using arduino uno. I found a dc motors that I would like to use:
robotshop.com/cytron-12v-1140rpm-6-37oz-gear-motor-encoder-2.html
I need help deciding what motor shield to use in order to run these motors (2 of them) forward and reverse (I never delt with encoders before). I want to send digital data (high (on)-1, low (off) -0) from the uno to the motor shield to tell it to go forward or reverse (so H bridge I am guessing). I also want to motors in sync so they both go forward or they both go in reverse. Please let me know if you have any suggestions on what motor shield to use or if I can hook it up directly to arduino uno.
Thank you!
hey!
so I bought the DFRobot 2A motor driver (2 of them actually) and I’m having a difficult time using it.
robotshop.com/dfrobot-arduino-compatible-motor-shield-2a-3.html
I am trying to run 2 dc motors but the controller is being very weird. When I turn on one of them, my motors turn clockwise fine (my motors are in series- .7 mA needed to control both of them). but when I put it in reverse, I notice that the voltage needs to build up to the needed voltage (9 ish). When it sits for a long time its almost impossible to get it going in reverse, but when I put it in forward, its perfectly fine.
I have pictures of my set up and when i turn one on for 1 direction then when I turn the other on for the other direction. When I measure the voltage for either of them I get 11 volts and -11 volts (forward/ reverse). I am using processing to turn on and off ports.
You also might be wondering why don’t I just use one motor and put it in forward or reverse. well for some odd reason processing and the ports for the DFrobot motor driver don’t work where if i send a signal to pin 4 or 7 while keeping pin 6 high (or something like that). Trust me, I tried many times to get it working and how I have it wired up is the only way to get it to work.
Again, when I turn it forward, the voltage shoots up to 9V. when I put it in reverse, it has to build up to the voltage. And when I disconnect the motor to the driver and put a multimeter to it, it goes to 11V and -11V. 
Any ideas on how I can fix this?