Murray Wiki - User contributions [en]

Hovercrafe Batteries and Charger Details

2008-01-29T07:29:45Z

Schantz:

{{MVWT menu}}
=== Batterie Specs ===
[[Media:hovercraft-design.pdf|MVWT II Design Documentation]], Wildanger et al, Sep 03, lists the batteries used as:
* 2 7.2v 950mAh Duralite batteries (PPD-7092)
* 1 7.2v 1800mAh Duralite battery (PPD-7092)

For three batteries total- which makes sense form the velcro pattern on the base.
The identical part numbers for the different batteries is confusing, I found a online store implying that the PPD-7092 part number goes with the 950mAh battery. On the Duralite web site they aren't selling batteries with these specs anymore. Duralite's current generation of batteries have more mAh, are rated at 7.4volts, and weigh more.

=== Charger ===
*Duralite battery chargers are primarily designed to be hooked up with a "jumper cable" like cable to a 12v car battery kind of thing. This can be spoofed with a standard lab bench power supply. Make sure the center post of the plug going into the charger is negative
*The online directions state that the light on the charger should light up when the battery being charged is plugged in - through its yellow lead, and then the light goes out when the battery is charged. It is reccomended that batteries not be left un-attended when charging, and to unplug them when fully charged.

=== Battery Preperation and Care===
* Fully charged 7.4v battery shows 8.2 - 8.4 volts when under no load. (7.4 volts under 1 amp)
* Do not discharge to under 5.5 volts.
* Batteries are drained at 6.9 volts under 1 amp load.
* Only charge using yellow lead
* Only power load using black lead

Hovercrafe Batteries and Charger Details

2008-01-29T07:27:59Z

Schantz:

{{MVWT menu}}
=== Batterie Specs ===
[[Media:hovercraft-design.pdf|MVWT II Design Documentation]], Wildanger et al, Sep 03, lists the batteries used as:
* 2 7.2v 950mAh Duralite batteries (PPD-7092)
* 1 7.2v 1800mAh Duralite battery (PPD-7092)

For three batteries total- which makes sense form the velcro pattern on the base.
The identical part numbers for the different batteries is confusing, I found a online store implying that the PPD-7092 part number goes with the 950mAh battery. On the Duralite web site they aren't selling batteries with these specs anymore. Duralite's current generation of batteries has more mAh, but also more weight.

=== Charger ===
*Duralite battery chargers are primarily designed to be hooked up with a "jumper cable" like cable to a 12v car battery kind of thing. This can be spoofed with a standard lab bench power supply. Make sure the center post of the plug going into the charger is negative
*The online directions state that the light on the charger should light up when the battery being charged is plugged in - through its yellow lead, and then the light goes out when the battery is charged. It is reccomended that batteries not be left un-attended when charging, and to unplug them when fully charged.

=== Battery Preperation and Care===
* Fully charged 7.4v battery shows 8.2 - 8.4 volts when under no load. (7.4 volts under 1 amp)
* Do not discharge to under 5.5 volts.
* Batteries are drained at 6.9 volts under 1 amp load.
* Only charge using yellow lead
* Only power load using black lead

Hovercrafe Batteries and Charger Details

2008-01-29T07:27:00Z

Schantz:

=== Batterie Specs ===
[[Media:hovercraft-design.pdf|MVWT II Design Documentation]], Wildanger et al, Sep 03, lists the batteries used as:
* 2 7.2v 950mAh Duralite batteries (PPD-7092)
* 1 7.2v 1800mAh Duralite battery (PPD-7092)

For three batteries total- which makes sense form the velcro pattern on the base.
The identical part numbers for the different batteries is confusing, I found a online store implying that the PPD-7092 part number goes with the 950mAh battery. On the Duralite web site they aren't selling batteries with these specs anymore. Duralite's current generation of batteries has more mAh, but also more weight.

=== Charger ===
*Duralite battery chargers are primarily designed to be hooked up with a "jumper cable" like cable to a 12v car battery kind of thing. This can be spoofed with a standard lab bench power supply. Make sure the center post of the plug going into the charger is negative
*The online directions state that the light on the charger should light up when the battery being charged is plugged in - through its yellow lead, and then the light goes out when the battery is charged. It is reccomended that batteries not be left un-attended when charging, and to unplug them when fully charged.

=== Battery Preperation and Care===
* Fully charged 7.4v battery shows 8.2 - 8.4 volts when under no load. (7.4 volts under 1 amp)
* Do not discharge to under 5.5 volts.
* Batteries are drained at 6.9 volts under 1 amp load.
* Only charge using yellow lead
* Only power load using black lead

MVWT hovercraft

2008-01-29T07:16:27Z

Schantz:

{{MVWT menu}}
[[Image:mvwt_hovercraft.jpg|thumb|right|Hovercraft vehicle]]
== Documentation ==
The MVWT hovercraft vehicles are small hovercraft that are controlled using a Zaurus PDA and a set of radio-controlled fans.
* [[Media:jin_etal04-acc.pdf|MVWT-II: The Second Generation Caltech Multi-Vehicle Wireless Testbed]], American Control Conference paper, 2004. Provides an overview of the system, including a description of the dynamics and some sample control implementations.
* [[Media:hovercraft-dynamics.pdf|Dynamics and Control of the MVWT Hovercraft]], Steve Waydo, 2003. A brief derivation of the dynamics of the hovercraft for use in designing controllers.
* [[Media:zaurus.pdf|The Zaurus Software Development Guide]], Rob Christy, Aug 03. Describes how to develop software on the Zaurus PDA.
* [[Media:mvwt-users.pdf|RoboFlag for MVWT Software Users’ Guide]], Rob Christy, 2003?. Describes how to run RoboFlag on the MVWT testbed, including information on cross compiling.
* [http://gc.caltech.edu/viewcvs/?root=mvwt MVWT code repository] - contains code for all MVWT systems. Look in [http://gc.caltech.edu/viewcvs/trunk/hovercraft/?root=mvwt hovercraft directory] for documentation and source code for the hovercraft.
* [[Media:hovercraft-design.pdf|MVWT II Design Documentation]], Wildanger et al, Sep 03. Detailed design documentation for the MVWT II hovercraft.

== Hardware Details ==
* [[Hovercrafe Batteries and Charger Details|Batteries and Charger Details]], The hovercraft uses Duralite Plus Lithium-Ion Batteries.

[[Category: MVWT documentation]]