July 1, 2020

Thank you so much, I would vote your answer up but I don’t have enough reputation. When an input is high then the output of a transistor is low. Extra voltage ratings are a good insurance. Sometimes, when the GPIO pins, which we are trying to use, might be doing some other functions. Is that possible with the circuit you provided above? Four transistors are taking four logics from PI to drive four stages of stepper motor. If you want to really do this right, add 1K to 10K resistors from emitter to base on Q2 and Q4.

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With this command the statements inside this loop will be executed continuously. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. With heavier loads it’s a good idea to use heatsinks on each transistor. By continuing to use this site, you are consenting to our use of cookies.

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If it is designed properly: Your upper-left label is wrong: Help identifying strange capacitor terminal style Started by Killians Yesterday at I have messed around with the resistance values within the program and still can’t appear to get what I am looking for.


This command executes the loop times, x being incremented from 0 to It would cause both transistors to come on giving a direct path to ground. For a better experience, please enable JavaScript in your browser before proceeding. If there is no delay given between the pulses, the stepper motor will not move at all.

Searching for “stepper motor” at the main Arduino site gets you to this resource: For more accurate information, look into the data sheet. Etepper lot depends on your motor type.

How large is your stepper motor? The circuit uses the back-EMF from a single motor coil to drive the transistor, so 2m2222 one transistor is all that is needed to turn the motor. Tip of the hat to Dave Tweed.

Motor driver using only a 2N transistor? – Electrical Engineering Stack Exchange

Well, by motor driver I am using a Raspberry Pi to output 3. Looking at the 2N datasheet, at mA setpper be looking at a Vce of about 2V. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. Go through below tutorials:. We are setting four of GPIO pins as output for driving four coils of stepper motor.

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Also, the 2N is rated for 40V maximum, so you can’t drive high voltage motors. Each step of this motor completes 1. So with two buttons we can control the delay, which in turns control the speed of the stepper motor. No matter what I do to calculate the resistance value for the base of the transistors, I either make them get really hot, or can’t even get enough current through the H-bridge to properly light an LED.

Check this to properly understand the Stepper Motor Driver Circuit. However if you go to IGBT’s rather than junction transistors you can radically improve the efficiency and get higher operating voltages.

The inputs can be controlled from an Arduino. So any motor you use must not consume more than this current when spinning and when stalled, or the transistor may burn. Search your stepper motor model number to know voltage rating.

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