vb.net barcode scanner tutorial Stepper motors in Android

Encoder Universal Product Code version A in Android Stepper motors

Stepper motors
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Figure 10.11 is an electric equivalent circuit of the stepper motor we are using. The stepper motor has six wires coming out from the casing. Let s assume you just picked this stepper motor and didn t know anything about it. As stated before, the simplest way to analyze the motor is to check the electrical resistance between the leads. By making a table of the resistances measured between the leads you ll quickly find which wires are connected to which coils.
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10.11 Wiring of unipolar stepper motor
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10.12 Resistance reading from leads of unipolar stepper motor
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Figure 10.12 shows how the resistance of the motor we are using looks. There is a 13-ohm resistance between the center tap wire and each end lead, and 26 ohms between the two end leads. The resistance reading from wires originating from separate coils will show an infinitely high resistance (no connection). For instance, this would be the case when reading the resistance between the blue and brown leads. Armed with this information, you can wire it properly into a circuit.
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First test circuit and program
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After you are finished constructing the test circuit, program the PIC with the following BASIC program. The program is kept small
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I Table 10.3 Full-Step Transistors
Q1 Q2 On On Q3 On Q4 On Port B Output (decimal) 1 2 4 8
and simple to show how easy it is to get a stepper motor moving. Table 10.3 shows that each step in the sequence turns on one transistor. Use Table 10.3 to follow the logic in the PICBASIC program. When you reach the end of the table, the sequence repeats starting back at the top of the table.
Stepper Motor Controller Symbol TRISB = 134 Symbol PortB = 6 symbol ti = b6 ti = 25 start: pause ti pause ti pause ti pause ti goto start Poke TRISB,0 poke portb,1 poke portb,2 poke portb,4 poke portb,8 Initialize TRISB to 134 Initialize portb to 6 Initial ti delay Set PORTB lines output Step 1
Set delay to 25 ms Forward rotation sequence Delay Step 2 Step 3 Step 4 Do again Delay Delay Delay
One rotation Using whole steps, the stepper motor requires 200 pulses to complete a single rotation (360 degrees/1.8 degrees per step). Having the PIC microcontroller count pulses allows it to control and position the stepper motor s rotor.
Second PICBASIC program
This second PICBASIC program is far more versatile. The user can modify programmed parameters (time delay) as the program is running using one of the four switches connected to port A. Pressing switch 1 (SW1) lengthens the delay pause between steps in the sequence and subsequently makes the stepper motor rotate slower. Pressing SW2 has the opposite effect. If you press SW3,
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the program halts the stepper motor and stays in a holding loop for as long as SW3 is closed (or pressed). Rotation direction, CW or CCW, is controlled with SW4. Pressing SW4 reverses the stepper motor direction. The direction stays in reverse for as long as SW4 is pressed (or closed).
Stepper motor controller Symbol TRISB = 134 Symbol TRISA = 133 Symbol PortB = 6 Symbol PortA = 5 symbol ti = b6 ti = 100 start: pause ti pause ti pause ti Poke TRISB,0 poke portb,1 poke portb,2 poke portb,4 poke portb,8 Initialize TRISB to 134 Initialize TRISA to 133 Initialize portb to 6 Initialize porta to 5 Initial ti delay Set PORTB lines output Step 1 Step 2 Step 3 Step 4 Jump to check switch status Reverse motor rotation sequence Step 1 Step 2 Step 3 Step 4 Jump to check switch status Peek the switches If SW1 is closed, increase ti If SW2 is closed, decrease ti Stop motor Go forward Delay Delay Delay Delay Switch status
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