During this week, there was a large amount of progress towards having the half-scale bogie fixed and improved. The mechanical team was able to send parts to get machined such as spacers, shafts, jackets, and gears. Until the mechanical design team members get door codes, they will have to wait for the central shop to finish machining their parts. During this waiting period to get parts, the mechatronics team has been developing a test rig to emulate the performance of the half-scale bogie. A new braking method was proposed with intentions for a reliable fail safe. Regen braking continued to be looked into and be implemented with the brushed DC motors within the next few weeks.
To create the test rig, we began by utilizing the hall effect sensor, and two DC motors.
This will emulate the propulsion of the half-scale bogie. When the hall
effect sensor encounters a magnet, both of the DC motors stop moving.
Afterwards, we used a different Arduino to emulate the steering of the
half-scale bogie. When the limit switch is pressed, the stepper motor
starts rotating. Combining the two proves to be a bigger challenge,
because the limit switch sends a magnetic signal to the hall effect
sensor. Next week, we will figure out a way to filter out the limit
switch signal. Another problem that presented itself was the lack of a
reliable power supply, which will also be solved next week.
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| Figure 1. Two DC Motors and a Hall Effect Sensor |
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| Figure 2. Stepper Motor, RGB LED, and Limit Switch |
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| Figure 3. Test Rig With Components From Figures 1 and 2 |
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