Images Scientific Instruments Inc. sitemap







Half Stepping


USB Stepper Motor Kit USB Stepper Motor Kit Pic Stepper Motor Kit PIC Stepper Motor Kit Stepper Motor Stepper Motor

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.

Previous Page | Next Page