INTRODUCTION
Many devices function without ever knowing whether they are doing the job that they were programmed to do.
EQUIPMENT
- RoboPro software
- fishertechnik components:
- Interface, power supply, USB cable
- 5 wires
- Motor
- 2 lamps
- Photocell
- Phototransistor
- 2 mini switches
- 9 building blocks (30 mm)
- 8 building blocks (15 mm) (1 pin)
- 3 rack and pinion (60 mm)
- Motor rack gearbox
PROCEDURE
In this activity
1. Buld the support system pictured below.
2. Add the motor and gearbox as shown below, and then wire the motor to M1 on the interface. Slightly loosen the gearbox from the motor so that you can feely adjust the motor. beofe
3.
4.
5. Is this an open loop or a closed loop system?
This is an open loop system because there is no feedback from the device.
6. Where do you think the gearbox would have come to rest had you set the program to cycle 120 times?
The gearbox would have probably come to rest at the farther end of the track (relative to the starting end).
7. What problems and inefficiencies might this process cause if it were used in an assembly mechanism designed to run 24 hours per day for several days?
The device would have to "calibrate" it's starting point in a sense. That would take at least one other sensor and a little bit more time that would add to the overall time it would take without this extra step for days and days, making the process of building the days quota take a little longer than normal.
.JPG)
9. Is this an open loop or closed loop system?
This is an open loop system because the system is using the feedback to direct the programming from there.
10. How precise would this device be if it were designed to cycle 500 times?
This device would be very precise, because the feedback doesn't change and neither does the programming to shuttle it back and forth between the two switches.
CONCLUSION
1. Describe an open loop system that has not already been given as an example. Could the system benefit from feedback? Justify your answer.
A conveyor belt that just runs and runs on and on until the cows come home is an open loop system. This system could benefit from feedback if there were sensors placed around a room and there was a malfunction on the track, it could stop and proceed with the necessary reaction to fix the problem. That way humans would not have to manually fix the problem and the system would be more efficient in general.
2. Describe a closed loop system that has not already been given as an example. Describe the feedback utilized, and describe why that type of feedback is utilized.
A closed loop system that has not already been given as an example would be something like a light switch. The feedback comes from the flip of the switch indicated to the light to turn on or off. That type of feedback is utilized because it makes the use of the appliance easier for humans in general. Clapping and sound sensors in a room also sometimes generate light from lamps and other bulbs and things in a room (in some very rare cases)
Many devices function without ever knowing whether they are doing the job that they were programmed to do.
EQUIPMENT
- RoboPro software
- fishertechnik components:
- Interface, power supply, USB cable
- 5 wires
- Motor
- 2 lamps
- Photocell
- Phototransistor
- 2 mini switches
- 9 building blocks (30 mm)
- 8 building blocks (15 mm) (1 pin)
- 3 rack and pinion (60 mm)
- Motor rack gearbox
PROCEDURE
In this activity
1. Buld the support system pictured below.
2. Add the motor and gearbox as shown below, and then wire the motor to M1 on the interface. Slightly loosen the gearbox from the motor so that you can feely adjust the motor. beofe
3.
4.
5. Is this an open loop or a closed loop system?
This is an open loop system because there is no feedback from the device.
6. Where do you think the gearbox would have come to rest had you set the program to cycle 120 times?
The gearbox would have probably come to rest at the farther end of the track (relative to the starting end).
7. What problems and inefficiencies might this process cause if it were used in an assembly mechanism designed to run 24 hours per day for several days?
The device would have to "calibrate" it's starting point in a sense. That would take at least one other sensor and a little bit more time that would add to the overall time it would take without this extra step for days and days, making the process of building the days quota take a little longer than normal.
.JPG)
9. Is this an open loop or closed loop system?
This is an open loop system because the system is using the feedback to direct the programming from there.
10. How precise would this device be if it were designed to cycle 500 times?
This device would be very precise, because the feedback doesn't change and neither does the programming to shuttle it back and forth between the two switches.
CONCLUSION
1. Describe an open loop system that has not already been given as an example. Could the system benefit from feedback? Justify your answer.
A conveyor belt that just runs and runs on and on until the cows come home is an open loop system. This system could benefit from feedback if there were sensors placed around a room and there was a malfunction on the track, it could stop and proceed with the necessary reaction to fix the problem. That way humans would not have to manually fix the problem and the system would be more efficient in general.
2. Describe a closed loop system that has not already been given as an example. Describe the feedback utilized, and describe why that type of feedback is utilized.
A closed loop system that has not already been given as an example would be something like a light switch. The feedback comes from the flip of the switch indicated to the light to turn on or off. That type of feedback is utilized because it makes the use of the appliance easier for humans in general. Clapping and sound sensors in a room also sometimes generate light from lamps and other bulbs and things in a room (in some very rare cases)
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