Snapshots of my Raspberry PI underwater video ROV

[@gravitylost1]

My parts list: HobbyKing: 36638 Turnigy D2836/11 750KV Brushless Outrunner Motor+ shaft connecter set, TTS-18A/32466 Turnigy TrackStar 25A 1/18th Scale Brushless Car ESC, 3-axis compass module - HMC5883L, (didn't work properly, I now own a BN055 gyro), Raspberry Pi Camera Module (not very good in low light, luckily have the Gopro for images afterwards), Tenda poweradaptor V2 (to improve communication over 2 wires), MB7092 transponder (height sensor;TTY), MS5837 depth sensor (I2C), Sidewinder USB Joystick, one 100m flexible twisted pair from a UTP cable (tether), cheap 2A cigarette lighter USB adaptors to step down from 11.1V to 5V,

[@sumeyrakr1982]

Hi! Congratulations! I wanna ask somethings. How did you prevent waterproofness? What did you use to prevent waterproofness? We are doing a rov and i wanna learn. How can we provide waterproofness? Thank you

[@bibfortunatv9303]

Good job man

[@sinsofyourpast]

i too want to do something similar with a ras pi. what did you use? did you have to do any coding yourself? how did you get the microsoft controller to work or control?

[@kingofcastlechaos]

very nice!

[@riteshbhoir1253]

How the motar be waterproof what is the process of waterproofing

[@peggycarter6515]

Good job! Thank you. Did you use PID algorithm?

[@davidizquierdogomez]

Nice job !!!! How long did the brushless motors resisted the corrosion?

[@gravitylost1]

Hi David, I think I have made about 15 runs in sweet water without much drying or spraying the bearings, which would have helped I suppose. They were completely worn out and corroded when I replaced them by INOX bearings. For my type of motors I bought inox bearings in France, they are sold for fishing reels. 4X8X3 INOX SMR84 ZZ and ROULEMENT A BILLES 4X8X3 INOX SMR84 ZZ via eBay. Around 35 euro including shipping for 3 motors. More than the motors are worth, however else you keep replacing them.

[@davidizquierdogomez]

Niels Affourtit ok....so the brushless motors stays alright and the only problem are the bearings? What about the electricity running through the copper coils underwater???

[@gravitylost1]

Yep. No problems with the rest yet. I have had 2 tether breaks recently, so I have the idea the tether is wearing out on frequently bent spots. I focus now on cable break scripts to stop and surface the ROV and i am considering to attach a rope to the tether in case the electrical cables break

[@davidizquierdogomez]

Ok nice...I see. I´m afraid that the brushless are gona dye very soon if I use the barren in salt water. Hence I´m trying to set up a nice magnetic coupling but it´s very slow process (not enough time). In regard with the tether, I´ve done my own unit with an 8mm intern diameter, 12 mm extern diameter house (merlett brand) of 50 m long and 6 cables inside and it works very nicely. I´m using it to wire a gopro underwater: battery, shooter and power button. It´s very robust. How do you insert the tether in the ROV?

[@gravitylost1]

I have glued the tether in the hull with epoxy. I create a U shaped pocked in the PVC and fill it with epoxy. Since the tether is connected to the TENDA home plugs, I can simply use a waterproof connector like described here: forum.openrov.com/t/tether-disconnect/2909

[@gravitylost1]

No, I didnt waterproof them. I only used ptfe on the bearings when they got stuck. I should have used something better like grease or corrosionX...however they cost only 10eur a piece so no big loss.

[@rluxon]

Wow. Pretty much what I’m trying to do. Can I get the files off you by chance?

[@CapyCamper]

Can you tell us the parts you bought? (Type of motor, board, sensors)

[@ДмитрийКудинов-э7я]

Hello. What software you use for control of the ROV?

[@gravitylost1]

Дмитрий Кудинов i have written a python script to communicate over a socket connection. The pwm commands are send via pi-blaster. The joystick i read out with pygame and the keyboard with win32api.

[@rayjohannsson6351]

Hi Niels. You used a 12 volt battery on the surface and transmit the power (and data) to the ROV over 2 wires for a distance of 50m? I am surprised that works (I thought there would be too much of a power loss along such a long, small guage wires). If this is how you implemented your ROV, I may rethink my design too! thanks -Ray

[@rayjohannsson6351]

No, after seeing another webpage on your build, it looks like you have a LiPo battery on board for power. The tether wires only seems to be for communication purposes.

[@gravitylost1]

Ray Johannsson, indeed, a few Watt is all you can sqeeze through those wires, so I don't. One 3S lipo on board and one onshore on the tether for the tenda and the wifi router. With the router i am free to move the laptop around. I have tested my new sonar and depth keeping script and should share some video soon. This week I printed cages for the ducted props, since the tether was cut by the prop for the second time! Good luck with yours

[@TomKnudsen]

Hi sir.. Where did you get the code to control it, are there any UI or scripts to raspberry to be found

[@gravitylost1]

Hi Tom, I partially used the scripts from RemoteJoyBorg. They tell you how to read a joystick and connect to the raspberry. I can share my Python files, but I don't know how.

[@TomKnudsen]

Hi you can use website named pastebin and send the link to [e-mail]

[@rsokors]

How is the screw cap on the front viewing port holding up?

[@gravitylost1]

That screw connection is performing very well. The screen is pressed against the O-ring by this screw and tightens even more with depth. I do see little wear on the threads, but don't think that'll become a problem.

[@rsokors]

+Niels Affourtit Thanks. I might try that on mine!

[@rsokors]

+Niels Affourtit I started looking for it, but can't find it yet. Does the cap have a special name so I can locate it?

[@gravitylost1]

+rsokors PN6 4” socket union BIFV PVC-U. Contact your local pipe dealer. The screen i cut myself with a router

[@rsokors]

+Niels Affourtit Thanks!

[@balarkagoswami9235]

Sir ,can I get the code for this rov

[@gravitylost1]

Yes. Do you need the scripts or the complete image? Please contact me at [e-mail].

[@mohabmohamed6149]

Can i get the full python code ?

[@mekala6226]

can you share the proppellers stl files ?

[@gravitylost1]

Can you access them via my Gdrive? drive.google.com/drive/folders/1TxkqlL3mlrMy0tKbd_zDjb08B3-B9nYl?usp=sharing The dia is 65mm the pitch 35 and the thickness 1 and 2mm.