March 7, 2014
Robodox ROV team is building an OPENROV 2.5 kit for Algalita Research Foundation to take on their July 2014 Pacific Gyre expedition. The ORV catamaran , named Alguita, will take a team of scientist to sample and analyze the effects of plastic in the ocean on marine species. To help extend their capability to locate plastic concentrations they are utilizing a variety of sensors. One is a Phantom quadcopter drone equipped with a Fat Shark Predator V2 FPV system.
The Predator V2 uses two LCD screens to display video in goggles show below.
The Predator specifications are shown here. Pictures are sent from an aerial camera platform to the goggles in real time over a 5GHz wireless link.
The underwater ROV that Robodox is building will do a similar function by transmitting HD camera video to a topside Laptop computer over a two wire tether. It would be desirable if the Fat Shark video goggles could also display the Laptop video sent by the ROV. Unfortunately the video formats are not compatible without a VGA to composite video converter. I did a little research into how this could be accomplished.
Here is the plan:
1) purchase a Tmart $3 VGA to A/V RCA converter.
2) Purchase an $3.50 Allelectronics 3.5mm A/V to RCA cable with 6 ft extension to allow freedom of movement between the laptop and the goggles.
3) Plug the VGA converter into the laptop VGA output port and then plug the 3.5mm A/V cable into the Fat Shark video input port via the extension. Turn off the Fat Shark wireless receiver.
Seems like this would work…yet to be tested.
Wireless Connection to the Fat Shark
The transmitter side of the Fat Shark FPV system involves a small 600 TVL camera that plugs into a transmitter compatible with the receiver in the goggles.
If the transmitter is available on the boat (ie a spare that is used for the Phantom drone) then the output of the converter could be used in place of the camera output that plugs into the transmitter. This way the goggles could be free from any wires. There would be another plug adapter to mate the composite video RCA plug to the plug on the xmitter.
March 5, 2014
GHCHS Team 599 Robodox attended the 2014 Inland Empire Regional FRC competition. We collected the Engineering Design award and also the competition finalist award and medals. It was a well run competition and we had a great time. Once again we had a top performing robot that got beat by a stronger no 1 alliance. We made an operational mistake in the finals that cost us the first match by breaking communication during setup and causing our Crio to need resetting after the match started and we sat out the Autonomous plus some seconds. Our alliance partners 294 and 4139 were having functional problems in the second so we were soundly trounced by the winning alliance led by 1678 citrus circuits who teamed up 399 and 4161. The 2nd final match (see video) was a thing of beauty with 1678 and 399 performing two truss catches and racking up a 229 to 72 score. Hopefully we can redeem ourselves at our next regional in Sacramento where we will once again tangle with 1678 citrus circuits from Davis. Also, thanks again to 294 for selecting us for the direct eliminations.
Winning the engineering design award means a lot to us since this year we focused on doing a 3D Solidworks design supported by solid prototyping. All fabrication was done based upon automated drawings made from the 3D model. This the best looking robot we have done in years and clearly the most durable. See this post for picture.
Lots more pictures on my facebook page.
The choo-choo catapult reset mechanism performed well so long as we kept the linkages in good order. The high forces caused holes in the linkages to elongate after a day worth of shooting. This was anticipated so we brought three spares and used them all. We will use steel linkages rather than aluminum at our next competition so they should last longer.
Robodox also ran the robot First Aid Station and the spare parts booth. We also had on display our underwater ROV which will be used by Algalita Research Foundation to do plastic pollution exploration in the Pacific Gyre this summer.
February 26, 2014
Come see us compete this Saturday and Sunday with our new robot at 2014 Frc Arial Assist Inland Empire Regional, We will also have our Algalita underwater ROV on display to play with.
Robot is a catapult with Choo Choo reset mechanism. < 2 sec recock. Full range capability allows multi ball shooting capability during 10 second autonomous. Drive is a dual speed 4 CIM West Coast configuration. Pneumatic intake arm control.
Preview video of the Anesthesiologist.
January 30, 2014
This year’s FRC robot has a catapult arm that requires a reset wheel mechanism that will pull the arm down and release it automatically by just rotating a single “choo-choo” wheel. The exact linkage lengths and relative pivot point locations are determined by the attached excel program.
2014 FRC arm pivot geometry calculation
December 24, 2013
I was in the SF bay area for a family visit and decided to drop in and visit OpenROV headquarters in Berkeley on my way home. I met up with Eric Stackpole
who was very generous with his time and showed me around their two room headquarters. The picture shows me holding the 2.5 OpenROV with its lasers shinning above the test tank. Eric is on my right. In the background is the video image being sent in real time HD to the LCD screen. The lasers serve to give a measure of distance the ROV is from an object by the spacing between them on the LCD screen.
I didn’t get a picture of their Laser Cutter and was surprised that such a huge machine was only $10k. Eric also said that 2.6 OpenROV design is moving along. It has a few structural updates and a larger wider O ring seal on the electronics tube.
I was able to pick up some equipment that we need to complete our Granada Hills Charter High School Robodox OpenROV 2.5 build . The build will be given to Algalita research foundation for use on their upcoming 2014 summer expedition. It will be used to image plastic pollution in the Pacific Gyre. Shown below are the motors, esc’s , two small lasers, the 100m tether and of course Dave’s Zero to Maker book which Eric donated to our cause. (Thanks again Eric). BTW, the Robodox team was selected to participate in Algalita’s 2014 Youth Summit. This is quite an honor and congratulations are in order. Here was their application video.
Here is the Pelican case that can carry two OpenROV’s on trips. We might purchase one of these …however they run around $150.
I brought a former student of mine , Ramin, who is attending UCB to show him around. I used to attend UCB and had fun seeing some old haunts. Ramin was captain of our Grant Vex team a few years back and has some interest in robotics. However, he is involved with cutting edge research now on the use of Graphene. Here he is in the STM lab where he works.
December 4, 2013
See on Scoop.it – Synthetic Sea Solutions
The long and windy path to a Ph.D. is lined with blood, sweat and tears. Like a roller coaster, it can be filled with joy, anxiety, fear and even nausea.
See on deepseanews.com