Ulysses Flight Computer - Revision history

Neon: /* Rev 2.2 */

2025-05-24T12:34:52Z

Rev 2.2

← Older revision		Revision as of 12:34, 24 May 2025
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	the n.7 was a complete assembly. No further problems were encountered, other than the one already listed.		the n.7 was a complete assembly. No further problems were encountered, other than the one already listed.

			=== Rev 2.3 ===
			the n.8 was a complete assembly. The MPM battery regulator was burned during operation at Roccaraso (2025) due to a wrong external battery connector, with inverted polarity. The MCU is still working and the board is pending repairs

			the n.9 was a complete assembly. No fault was detected. This board flown in the maiden flight of Minerva 2.

			the n.10 was a complete assembly. No fault was detected. This board is meant as a backup for the competition flight of Minerva 2.

Neon: /* Problems */

2025-04-26T13:25:15Z

Problems

← Older revision		Revision as of 13:25, 26 April 2025
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	==== Problems ====		==== Problems ====

	* The VND5160 footprint is wrong, resulting in the lack of pyro channel n.2		* <s>The VND5160 footprint is wrong, resulting in the lack of pyro channel n.2</s>
	* The PMOS footprint is wrong, resulting in the lack of both servo channels (this can be resolved bypassing the PMOS)		* The PMOS footprint is wrong, resulting in the lack of both servo channels (this can be resolved bypassing the PMOS)
	* The sensor's CS pins have no pull high, resulting in problems talking to them trough the StampXL. This can be fixed in software.		* The sensor's CS pins have no pull high, resulting in problems talking to them trough the StampXL. This can be fixed in software.

Neon: /* Soldered Boards */

2025-04-22T15:24:56Z

Soldered Boards

← Older revision		Revision as of 15:24, 22 April 2025
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	the n.6 was a complete assembly. We discovered the problem with the pyro channel [n.2] and the problem with the pull-highs on the sensor's SPI channel. Other than some small details, the board result completely working. A buzzer was also mounted, while it lacks a pull low, it is completely functional.		the n.6 was a complete assembly. We discovered the problem with the pyro channel [n.2] and the problem with the pull-highs on the sensor's SPI channel. Other than some small details, the board result completely working. A buzzer was also mounted, while it lacks a pull low, it is completely functional.

	the n.6 was a complete assembly. No further problems were encountered, other than the one already listed.		the n.7 was a complete assembly. No further problems were encountered, other than the one already listed.

Neon: /* Soldered Boards */

2025-04-22T15:24:46Z

Soldered Boards

← Older revision		Revision as of 15:24, 22 April 2025
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	the n.6 was a complete assembly. We discovered the problem with the pyro channel [n.2] and the problem with the pull-highs on the sensor's SPI channel. Other than some small details, the board result completely working. A buzzer was also mounted, while it lacks a pull low, it is completely functional.		the n.6 was a complete assembly. We discovered the problem with the pyro channel [n.2] and the problem with the pull-highs on the sensor's SPI channel. Other than some small details, the board result completely working. A buzzer was also mounted, while it lacks a pull low, it is completely functional.

			the n.6 was a complete assembly. No further problems were encountered, other than the one already listed.

Neon: /* Soldered Boards */

2025-04-22T15:24:07Z

Soldered Boards

← Older revision		Revision as of 15:24, 22 April 2025
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	==== Soldered Boards ====		==== Soldered Boards ====
	the n.5 was a complete assembly, lacking only the connectors. An over-application of solder paste resulted in a sensor failure and a short of the SPI bus. rework solved the short, but only one of the two IMU ended up working. The rest of the sensor pack failed to respond to SPI calls. Also a problem with the n-mos controlling the speaker was detected, creating a 250 mA load, and overheating the speaker. This has been solved removing the n-mos controlling the speaker.		the n.5 was a complete assembly, lacking only the connectors. An over-application of solder paste resulted in a sensor failure and a short of the SPI bus. rework solved the short, but only one of the two IMU ended up working. The rest of the sensor pack failed to respond to SPI calls. Also a problem with the n-mos controlling the speaker was detected, creating a 250 mA load, and overheating the speaker. This has been solved removing the n-mos controlling the speaker. Another rework bringed every sensor except for the magnetometer back to life. It is now considered a working board.

	the n.6 was a complete assembly. We discovered the problem with the pyro channel [n.2] and the problem with the pull-highs on the sensor's SPI channel. Other than some small details, the board result completely working. A buzzer was also mounted, while it lacks a pull low, it is completely functional.		the n.6 was a complete assembly. We discovered the problem with the pyro channel [n.2] and the problem with the pull-highs on the sensor's SPI channel. Other than some small details, the board result completely working. A buzzer was also mounted, while it lacks a pull low, it is completely functional.

Neon: /* Soldered Boards */

2025-04-17T17:37:31Z

Soldered Boards

← Older revision		Revision as of 17:37, 17 April 2025
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	=== Rev 2.2 ===		=== Rev 2.2 ===
	Changes have been made from the rev 2.0 in order to comply to the [https://www.st.com/resource/en/technical_note/tn0018-surface-mounting-guidelines-for-mems-sensors-in-an-lga-package-stmicroelectronics.pdf TN0018] technical note from ST-Microelectronics on the sensor footprints. Also, an additional backup barometer and magnetometer have been added, as they have represented the biggest soldering challenge.		Changes have been made from the rev 2.0 in order to comply to the [https://www.st.com/resource/en/technical_note/tn0018-surface-mounting-guidelines-for-mems-sensors-in-an-lga-package-stmicroelectronics.pdf TN0018] technical note from ST-Microelectronics on the sensor footprints. Also, an additional backup barometer and magnetometer have been added, as they have represented the biggest soldering challenge.

			==== Problems ====

			* The VND5160 footprint is wrong, resulting in the lack of pyro channel n.2
			* The PMOS footprint is wrong, resulting in the lack of both servo channels (this can be resolved bypassing the PMOS)
			* The sensor's CS pins have no pull high, resulting in problems talking to them trough the StampXL. This can be fixed in software.

	==== Soldered Boards ====		==== Soldered Boards ====
	the n.5 was a complete assembly, lacking only the connectors. An over-application of solder paste resulted in a sensor failure and a short of the SPI bus. rework solved the short, but only one of the two IMU ended up working. The rest of the sensor pack failed to respond to SPI calls. Also a problem with the n-mos controlling the speaker was detected, creating a 250 mA load, and overheating the speaker. This has been solved removing the n-mos controlling the speaker.		the n.5 was a complete assembly, lacking only the connectors. An over-application of solder paste resulted in a sensor failure and a short of the SPI bus. rework solved the short, but only one of the two IMU ended up working. The rest of the sensor pack failed to respond to SPI calls. Also a problem with the n-mos controlling the speaker was detected, creating a 250 mA load, and overheating the speaker. This has been solved removing the n-mos controlling the speaker.

			the n.6 was a complete assembly. We discovered the problem with the pyro channel [n.2] and the problem with the pull-highs on the sensor's SPI channel. Other than some small details, the board result completely working. A buzzer was also mounted, while it lacks a pull low, it is completely functional.

Neon: /* Sensors */

2025-04-15T09:47:51Z

Sensors

← Older revision		Revision as of 09:47, 15 April 2025
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	=== Sensors ===		=== Sensors ===
			The Ulysses flight computer mounts a 10 DoF sensor pack, capable of fixing in place both position and orientation of the vehicle at any time trough integration. In the future it shoud be possible to also integrate the GPS data trough the UART telemetry channel, coming from the Telemacus radio & tracker.
			{\| class="wikitable"
			\|+
			!Sensor
			!designation
			!quantity
			!resolution
			!precision
			\|-
			\|IMU
			\|lsm6dso32
			\|2
			\|
			\|
			\|-
			\|magnetometer
			\|lis3mdl
			\|1
			\|
			\|
			\|-
			\|barometer
			\|bmp390
			\|1
			\|3 Pa
			\|50 Pa
			\|}

	===== lis3mdl =====		===== lis3mdl =====

Neon: /* Rev 2.2 */

2025-04-10T23:31:47Z

Rev 2.2

← Older revision		Revision as of 23:31, 10 April 2025
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	=== Rev 2.2 ===		=== Rev 2.2 ===
	Changes have been made from the rev 2.0 in order to comply to the [https://www.st.com/resource/en/technical_note/tn0018-surface-mounting-guidelines-for-mems-sensors-in-an-lga-package-stmicroelectronics.pdf TN0018] technical note from ST-Microelectronics on the sensor footprints.		Changes have been made from the rev 2.0 in order to comply to the [https://www.st.com/resource/en/technical_note/tn0018-surface-mounting-guidelines-for-mems-sensors-in-an-lga-package-stmicroelectronics.pdf TN0018] technical note from ST-Microelectronics on the sensor footprints. Also, an additional backup barometer and magnetometer have been added, as they have represented the biggest soldering challenge.

	==== Soldered Boards ====		==== Soldered Boards ====
	the n.5 was a complete assembly, lacking only the connectors. An over-application of solder paste resulted in a sensor failure and a short of the SPI bus. rework solved the short, but only one of the two IMU ended up working. The rest of the sensor pack failed to respond to SPI calls. Also a problem with the n-mos controlling the speaker was detected, creating a 250 mA load, and overheating the speaker. This has been solved removing the n-mos controlling the speaker.		the n.5 was a complete assembly, lacking only the connectors. An over-application of solder paste resulted in a sensor failure and a short of the SPI bus. rework solved the short, but only one of the two IMU ended up working. The rest of the sensor pack failed to respond to SPI calls. Also a problem with the n-mos controlling the speaker was detected, creating a 250 mA load, and overheating the speaker. This has been solved removing the n-mos controlling the speaker.

Neon: /* USB port */

2025-04-10T21:52:45Z

USB port

@@ Line 64: / Line 64: @@
 === USB port ===
 A USB type-c port is available on the side of the board. This may be blocked during assembly of the avionics bay. It is used for programming the board and recovering file in case of a filesystem in the FLASH memory.
 == History ==

Neon: /* Pyro Channels */

2025-04-10T21:42:09Z

Pyro Channels

← Older revision		Revision as of 21:42, 10 April 2025
Line 41:		Line 41:

	=== Pyro Channels ===		=== Pyro Channels ===
			[[File:Ulysses Pyro Schematic.png\|alt=Ulysses Pyro Schematic showing the connection for the VND automotive switch and the low side mosfet\|thumb\|Ulysses Pyro Schematic showing the connection for the VND automotive switch and the low side mosfet]]
			The Board currently host the capability for connecting up to two pyro channels. The circuit is split between a high side and a low side in order to check fo the continuity of the pyros.

			We use a VND5160 automotive switch as the high side mosfet because it can limit the maximum current passing trough the channels to 5 Amps. This prevents a brownout of the board in case of a pyro short circuit, while ensuring the proper activation of every channel.

			To check for continuity on one of the pyro, the proper high side switch must be open, while the low side must be kept closed. A voltage different than 0 on the "pyro_check" pin should be correlated to the presence of continuity on the proper channel.

			To fire one of the channels, the low side and the appropriate high side switch must be turn on at the same time.

			Power for the pyro channels comes from the "V_PYRO" net, which can be connected to the main battery or to an external battery with the correct setup of the pyro Nanofit connector at the base of the board depending on the need of the vehicle.

	=== I/O Ports & Connectors ===		=== I/O Ports & Connectors ===