USB Stepper Motor Kit
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PIC Stepper Motor Kit
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Stepper Motor
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As previously stated, half-stepping doubles the resolution of the motor. In our case, we are using a motor with a 5 degree / per step resolution, requiring 72 steps to complete one rotation. By half stepping, we could double this to 2.5 degrees / pulse, requiring 144 steps to complete one rotation. Table 2 shows the step pattern.
| Step | Q1 | Q2 | Q3 | Q4 |
| 1 | ||||
| 2 | ||||
| 3 | ||||
| 4 | ||||
| 5 | ||||
| 6 | ||||
| 7 | ||||
| 8 |
Table 2
There are two ways in which you could implement half-stepping in a PIC. One way would be to drive it directly, using the two previous listings, but replacing the high/low commands with the pins that correspond to each step. The other (and easier) way would be to use a UCN 5804 Stepper Motor IC in conjunction with the PIC.