vb.net barcode scanner tutorial Set delay to 100 ms Forward stepper motor rotation sequence Delay Delay Delay Delay in Android

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Set delay to 100 ms Forward stepper motor rotation sequence Delay Delay Delay Delay
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pause ti goto check start2: pause ti pause ti pause ti pause ti goto check Check:
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poke portb,8 poke portb,4 poke portb,2 poke portb,1
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Peek PortA, B0
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If bit0 = 0 then loop1 if bit1 = 0 then loop2 if bit2 = 0 then hold3 if bit3 = 0 then start goto start2 loop1: poke portb,0 ti = ti + 5 pause 50 Increase delay
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Go reverse Turn off transistors Increase delay by 5 ms Delay @@@@@@@ &&&&&&&&& %%%%%%%% ############# Team LRN
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if ti > 250 then hold1 peek porta,b0 goto check loop2: ti = ti pause 50 poke portb,0 5 if bit0 = 0 then loop1 Decrease delay
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Limit delay to 250 ms Still increasing delay
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Check switch status If not, jump to main switch status Turn off transistors Decrease delay by 5 ms Limit delay to 20 ms Still decreasing delay
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Pause a moment Check switch status If not, jump to main switch status to 250 ms Go back to 25 ms Go back Turn off transistor Check switches Keep motor off Stop stepper motor Limit lower delay
if ti < 20 then hold2 peek porta,b0 goto check hold1: ti = 245 goto loop1 hold2: ti = 25 goto loop2 hold3: poke portb,0 peek porta, b0 goto check check if bit1 = 0 then loop2
Limit upper delay
if bit2 = 0 then hold3
If not, go to main switch status
The schematic for this program is shown in Fig. 10.13. In the photograph of the circuit (see Fig. 10.14), the four switches are difficult to make out. There are the four bare wire strips behind the PIC microcontroller. The top sides of the bare wire strips are connected to 5V through 10K-ohm resistors. A wire from each switch is connected to the appropriate pin on port A. A single wire is connected to ground and is used to close any of the switches by touching the bare wire strip. Half stepping Half stepping the motor will effectively double the resolution. In this instance it requires 400 pulses to complete one rotation. Table 10.4 shows the switching logic needed in a program. When you reach the end of the table, the sequence repeats starting back at the top of the table. The ti delay variable The ti variable used in each PICBASIC program controls a delay pause whose purpose is to slow down the output sequence to port B. Without the pause, the sequence may run too fast for the stepper motor to respond, causing the stepper motor to malfunction.
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10.13 Microcontroller stepper circuit with option switches
You may want to vary the ti variable in the program depending upon your PIC crystal speed. You can experiment with the ti variable until you find the best range for your particular PIC.
Troubleshooting
If the motor doesn t move at all, check the diodes. Make sure you have them in properly, facing in the direction shown in the schematic. If the stepper motor moves slightly and/or quivers back and forth, there are a number of possible causes. 1. If you are using a battery power supply, the batteries may be too weak to power the motor properly. Note: Batteries wear out quickly because the current draw from stepper motors is usually high. 2. If you substituted the TIP 120 NPN transistor for another transistor, the substitute transistor may not be switching
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10.14 Microcontroller stepper motor circuit I Table 10.4 Half-Step Transistor
Q1 On On On Q2 On On On Q3 On On On Q4 On On On Port B Output (decimal) 1 3 2 6 4 12 8 9
properly or the current load of the stepper motor may be too great. Solution: Use TIP 120 transistors. 3. You have the stepper motor improperly wired into the circuit. Check the coils using an ohmmeter and rewire if necessary. 4. The pulse frequency is too high. If the pulses to the stepper motor are going faster than the motor can react, the motor will malfunction. The pulse frequency is controlled by the ti variable in the program. Increasing the value of this variable will slow down the pulse frequency to the stepper motor. The solution to this is to reduce the pulse frequency.
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