My goal is to drive 6 of those bad boys for a university project. The seller has listed these motors as 3-5V and suggested using a stepper driver limited to 100mA current.
As I am completely new to stepper motors I have searched the forum for related projects and schematics . Are there any suggestions or schematics available? Shall I try to use an H bridge circuit ?
If you use a h-bridge you will need 4 Arduino I/O pins for each motor and if you want a fast step rate for all the motors at the same time a 16MHz Arduino may not be fast enough.
Using a specialized stepper driver such as a Sparkfun Easydriver you will only need two Arduino pins for each motor and the computation load for the Arduino will be considerably lower.
Hey thanks for the quick reply. I have read the links posted above but I am still confused about the circuit . I can’t find more infos about limiting the current to 100mA. Also how it is possible to connect 6 of these tiny motors ?
Once again thanks for your time and the quick reply
A specialized stepper driver such as the Easydriver has the ability to limit the current to protect the motor - there is a small adjustment potentiometer. Study the Sparkfun webpage.
With a h-bridge you will just have to limit the current by limiting the voltage.
Many h-bridge datasheets show how to connect them to a stepper motor even though they are not ideal for that role.
Now that I remember, you need 2 h-bridges for each stepper motor.
If you are just using low voltages the Pololu DRV8833 dual h-bridge may be suitable. However study the data on the Pololu website carefully.