54 lines
1.8 KiB
Python
54 lines
1.8 KiB
Python
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# Once you’ve determined the min and max pulse width values you can use the “value” feature to position the servo arm
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# anywhere between its limits.
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# Setting the “value” parameter to a number between -1 and +1 moves the arm between its minimum and maximum positions.
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# Examples include :
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#
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# Minimum position
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# servo.value=-1
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#
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# Mid-point
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# servo.value=0
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#
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# Maximum position
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# servo.value=1
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#
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# Position between mid-point and maximum
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# servo.value=0.5
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#The script below generates a range of “value” numbers to sweep the servo between its maximum and minimum position
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from gpiozero import Servo
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from time import sleep
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myGPIO = 17
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myCorrection = 0
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maxPW = (2.0 + myCorrection) / 1000
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minPW = (1.0 - myCorrection) / 1000
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servo = Servo(myGPIO, min_pulse_width=minPW, max_pulse_width=maxPW)
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while True:
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print("Set value range -1.0 to +1.0")
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for value in range(0, 21):
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value2 = (float(value) - 10) / 10
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servo.value = value2
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print(value2)
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sleep(0.5)
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print("Set value range +1.0 to -1.0")
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for value in range(20, -1, -1):
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value2 = (float(value) - 10) / 10
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servo.value = value2
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print(value2)
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sleep(0.5)
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# The servo should now move between its minimum, middle and maximum positions with a small delay in-between.
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#
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# The first “For” loop generates a set of integers between 0 and 20. The value has 10 subtracted from it to give a
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# range -10 to 10. The value is then finally divided by 10 to give a range of -1 to +1. The original set of values
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# contained 20 integers and we still have 20 steps in the sequence. To increase the number of steps to 40 you would
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# replace 20 with 40 and subtract 20 rather than 10.
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#
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# The second “For” loop does the same thing but generates a sequence from +1 back to -1.
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