F16: The-Nine - Revision history

Proj user8: /* Conclusion */

2016-12-23T20:14:24Z

‎Conclusion

Proj user8: /* Parts List & Cost */

2016-12-23T06:43:35Z

‎Parts List & Cost

Proj user8: /* Parts List & Cost */

2016-12-23T06:38:34Z

‎Parts List & Cost

Proj user8: /* Conclusion */

2016-12-23T06:25:55Z

‎Conclusion

Proj user8: /* Conclusion */ Wrote a conclusion

2016-12-23T06:25:09Z

‎Conclusion: Wrote a conclusion

Proj user8: /* Battery voltage monitor */

2016-12-22T22:37:58Z

‎Battery voltage monitor

Proj user8: /* Ultrasonic sensors */

2016-12-22T22:06:26Z

‎Ultrasonic sensors

Proj user8: /* Printed Circuit Board */

2016-12-22T22:05:41Z

‎Printed Circuit Board

Proj user8: /* Printed Circuit Board */

2016-12-22T22:03:46Z

‎Printed Circuit Board

Proj user8: /* Printed Circuit Board */

2016-12-22T22:03:10Z

‎Printed Circuit Board

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 * Every voice counts. We all had different ideas about how things should be done, but the best results came from learning when to listen and when to give constructive and helpful criticism. We didn't want to be isolated to our own tasks and had an open dialogue across each sub-team about how we were going to implement things. This increased as the project progressed, for example we had the headlight design coming from our GPS team, with a 3D-printed mount and hardware implemented by our sensor team, and application control, manual button control, and light-sensitive controls programmed by our Bluetooth team. Even for a simple feature like this we were very pleased with the results because it was a collaborative effort and each team could contribute.
-Conclude your project here.  You can recap your testing and problems.  You should address the "so what" part here to indicate what you ultimately learnt from this project.  How has this project increased your knowledge?
+It would be hard to pinpoint exactly how our knowledge has increased because we've been exposed to a huge array of topics as part of this project. You could say we learned a little bit of everything!
 == Project Video ==

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 | Adafruit
 | 1
-| $25.00
+| $19.95
 |-
 |}</center>

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 |-
 ! scope="row"| 8
-| High Power Motor Driver
+| 24V21 High Power Motor Driver
 | [https://www.pololu.com/product/2995 Polulu]
 | 1
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 | 1
 | $50.00
 |-
 |}</center>

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 Some of our learning experiences were:
-* No last-minute changes. We had modified part of our motor handling before our second demo and it malfunctioned spectacularly by crashing into a wall at high speed. Later we realized that an unnecessary fail-safe circuit used to disconnect PWM from the motor had masked a bug in how the PWM object was instantiated, causing acceleration right after startup. More testing would have resolved this, but that needed to happen much earlier and not minutes before the demo.
+* No last-minute changes. We had modified part of our motor handling before our second demo and it malfunctioned spectacularly by crashing into a wall at high speed. We had found that an unnecessary fail-safe circuit used to disconnect PWM from the motor had masked a bug in how the PWM object was instantiated, causing acceleration right after startup. More testing would have resolved this, but that needed to happen much earlier and not minutes before the demo.
 * Don't trust good results. Our vehicle had navigated the campus several times flawlessly so all systems seemed to be good. Later we realized the magnetometer never really worked at all and wasn't calibrated either, merely by chance our previous runs had went well. What followed was a rush to characterize the problem and resolve it with time running out. Probably more comprehensive testing would have revealed this problem, as well as going through a checklist of common magnetometer issues to double-check we were addressing them as these issues are well documented on the internet.

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 == Conclusion ==
 Conclude your project here.  You can recap your testing and problems.  You should address the "so what" part here to indicate what you ultimately learnt from this project.  How has this project increased your knowledge?
 == Project Video ==

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 [[File:CMPE243_F16_The_Nine_Battery_Monitor.png|center|500px|Compass I2C connections to the SJSUOne Board.]]
-An LM341 adjustable zener diode is used to provide a 9V drop on the battery output. This is accomplished by using a voltage divider to set the reference voltage input on the LM341. At this point the maximum voltage output is 3.6V which is still out of range. A second voltage divider is used to scale it down to 3.3V, and a zener diode is used to clamp the output at 3.3V. This allows the SJOne board to read the battery voltage safely.
+An LM341 adjustable zener diode is used to provide a 9V drop on the battery output. This is accomplished by using a voltage divider to set the reference voltage input on the LM341. At this point the maximum voltage output is 3.6V which is still out of range. A second voltage divider is used to scale it down to 3.3V, and a regular zener diode is used to clamp the output at 3.3V. This allows the SJOne board to read the battery voltage safely.
 ====Compass====

← Older revision		Revision as of 22:06, 22 December 2016
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	In a future revision a better power switch would be the TPS2054 which has four independent outputs so each individual sensor could be recalibrated without disturbing the other ones. The sensor manufacturer also recommends a power filtering circuit for quadcopters which may be applicable to our autonomous vehicle, but testing would be needed to determine if that's the case.		In a future revision a better power switch would be the TPS2054 which has four independent outputs so each individual sensor could be recalibrated without disturbing the other ones. The sensor manufacturer also recommends a power filtering circuit for quadcopters which may be applicable to our autonomous vehicle, but testing would be needed to determine if that's the case.
−
−	~~===== RS-232 testing =====~~
−
−	The MaxBotix LV-MaxSonar-EZ1 (P/N# MB1010) has several interfaces used to indicate the distance to an obstacle that it has sensed. One of the simplest is a RS-232 output which is enabled by grounding the BW pin or leaving it unconnected (floating). The output is logic-level compatible with RS-232 (where a logic '1' is 0V and a logic '0' is Vcc) but not voltage-level compatible. MaxBotix designed the RS-232 output like this to allow direct connection to a RS-232 compliant serial port, but it means the logic levels are inverted with respect to the LPC1758 which has no on-chip provisions for inverting the logic level. Therefore an inverter (such as the 74LVC1G04) is required between the TX output of the MB1010 and the LPC1758's UART RX input for proper operation.

	=== Printed Circuit Board ===		=== Printed Circuit Board ===

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 * Pushbuttons for headlights and return to home
 * Headlight driver circuit
 [[File:CMPE243_F16_The_Nine_SCH.png|center|600px|thumb| Circuit Schematic]]

← Older revision		Revision as of 22:03, 22 December 2016
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	[[File:CMPE243_F16_The-Nine_manufactured-pcb_720.jpg\|center\|600px\|thumb\|Printed Circuit Board Manufactured]]		[[File:CMPE243_F16_The-Nine_manufactured-pcb_720.jpg\|center\|600px\|thumb\|Printed Circuit Board Manufactured]]
		+
		+	Fully assembled PCB mounted on acrylic sheet with all components attached.

	[[File:CMPE243_F16_The-Nine_populated-pcb_720.jpg\|center\|600px\|thumb\|Printed Circuit Board Populated]]		[[File:CMPE243_F16_The-Nine_populated-pcb_720.jpg\|center\|600px\|thumb\|Printed Circuit Board Populated]]

← Older revision		Revision as of 22:03, 22 December 2016
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	[[File:CMPE243_F16_The_Nine_SCH.png\|center\|600px\|thumb\| Circuit Schematic]]		[[File:CMPE243_F16_The_Nine_SCH.png\|center\|600px\|thumb\| Circuit Schematic]]
		+
		+	Printed circuit board from Bay Area Circuits (parts side):

	[[File:CMPE243_F16_The-Nine_manufactured-pcb_720.jpg\|center\|600px\|thumb\|Printed Circuit Board Manufactured]]		[[File:CMPE243_F16_The-Nine_manufactured-pcb_720.jpg\|center\|600px\|thumb\|Printed Circuit Board Manufactured]]