Hi MarkT thanks for the advices, I tried a different motor this one is bipolar from vexta model PK245-01AA which has a rating of 1.2A/phase 4v and with a resistance of 3.3 ohms. I based the design from a four wire circuit found here http://www.arduino.cc/en/Reference/StepperBipolarCircuit
with some adjustments.
- 1. I am using 7239D
- 2. I added five 0.1uF ceramics on pins 4,5,12, 13 and 16
- 3. I also added a 100uF 10v on pins 8 and 16
- 4. I also powered the circuit and the motor using arduino's Vin
I was able to run the motor however, I noticed that the H-bridge was taking up heat so fast. I'm assuming that the motor driver cannot handle the load from the stepper motor. Is there any way to avoid such heating issue? like adding a 7297? please advise.