How about the speed? The driver circuit takes logic triggers from PI. My stepper motor has a voltage rating of 9V so I am using a 9v battery as my second power source. The inputs can be controlled from an Arduino. However if you’re well into saturation you don’t really gain anything by going lower with the resistor – you are just wasting current from the controller then. The circuit uses the back-EMF from a single motor coil to drive the transistor, so that one transistor is all that is needed to turn the motor.

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Hero Banned Dec 17, I am pretty new to electronics prototyping and just need this info. Generally, go with a transistor in a TIP package – it’s easier to heatsink them is required. It would cause both transistors to come on giving a direct path to ground. If you use much less base current larger base resistorsthe power transistors will start getting hot, and the steppers won’t get their 2nn2222 current. Extra voltage ratings are a good insurance.

Stepper Motor Resources

The idea is to control the direction and the steps of the motor by switching the direction of the current flow using the H-bridges. By clicking stwpper Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.


We have all the commands needed to achieve the Speed Control of Stepper Motor with this. Each step of this motor completes 1.

n22222 Using audio amps means microstepping is straightforward, but you waste power as heat in the amps and you need a couple of DACs to generate the waveforms. The driver circuit takes logic triggers from PI. Obviously, you also want to look at maximum collector current, required base current to drive the transistor in saturation and the thermal properties.

Searching for “stepper motor” at the main Arduino site gets you to this resource: When an input is low then the output of a transistor is high. Change in direction is required and so is change in stepped. There is a ‘hybrid’ approach where you use 3 single-rail amplifiers. The 1N is a flywheeling diode. Thank you very much! What about braking the motor? With heavier loads it’s a good idea to use heatsinks on each transistor.

Simulation Models

In that case, we will receive warnings while executing the program. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. If you have a 6-wire motor it could be driven bipolar H-bridge or unipolar ULN or bank of transistors.


This circuit dtepper N-channel and P-channel Mosfets. However if you go to IGBT’s rather than junction transistors you can radically improve the efficiency and get higher operating voltages. If you want to really do this right, add 1K to 10K resistors from emitter to base on Q2 and Q4. For doing any of high profile projects, one need to understand the basic functions of PI.

A lot depends on your motor type. This does not apply to the low-side transistors. Of course a class D audio amp is a full H-bridge internally as it runs from single-rail. If we control the logic triggers, we control the power pulses and hence the speed of stepper motor.

Home Questions Tags Users Unanswered. The TIP series transistors are cheap and readily available you can probably find them at Radio Shack. By the end of this Raspberry Pi Stfpper Seriesyou will be able to do high profile projects by yourself. In fact the answer is that the H-bridge is needed unless you have a dual-supply setup such as audio power amps tend to use.

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