Pages: 1 2 [3]   Go Down
Author Topic: Cable for submarine robot  (Read 5089 times)
0 Members and 1 Guest are viewing this topic.
Offline Offline
Newbie
*
Karma: 0
Posts: 19
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset



I'm going to use one of these, it can reach 60-70 meters using an ethernet cable, max speed 12mbs -usb1.1. Already test it, and it works. You can find better ones that reach 100 meters but they are pricy. 60 meters is fine to start with.
Connection will be: pc----->usb ethernet converter----->60-70meters of cat5 cable----->ethernet to usb converter----->usb hub----->hd webcam(port1). /  arduino mega(port2)

Does anybody knows if A 12mbs usb connection supports an HD 720p webcam??
The problem is that the computer will comunicate with the arduino, using serial comunication, on the same cable of the webcam. I'm not shore that 12mbs is enough for both. Any body knows how many mbs takes an hd webcam? Otherwise I can always use a normal webcam.

This is a drawing of the electronic connections inside th rov + some photos of the electronics box already finished.






The electronic box works at 12 Vdc. It contains:
Arduino mega
Relays for outside Leds
Relays for internal strip Leds (just for fun)
Relays for 2 motors direction (fw-left/bw-left+ fw-right/bw-right)
Tip31c transistors for motors speed
5v voltage regulator (for steppers)
Plus 2 smal pc fans for cooling the transistors and the volt reg

Motors:

We've bought 2 RE-540/1 dc motor (http://www.mfacomodrills.com/motors/540-1.html) and propellers (different sizes to test, from 35mm to 50mm).
These will move the Rov underwater. One on the left and one on the right side, so you can go forward, backward, and 360 degres turning by giving opposite directions.
Behind the motors there are rudders (controlled by stepper motors) for going up and down.

The dc motor will stay in the water, because normal brush motor(and some brushless) can go undervater with no problem. The trick is to spray it with products like CRC Marine 6-66 or WD40.
Tests seem to confirm. I've only tried with unsalted water.
Logged

Norfolk UK
Offline Offline
Faraday Member
**
Karma: 71
Posts: 2612
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Quote
Does anybody knows if A 12mbs usb connection supports an HD 720p webcam??
I'm sure that USB 1.1 is to slow for HD webcam and feeding 2 of them + Arduino control would surly be to much. Could you use an Ethernet shield and a 4 port Ethernet switch to plug I/P webcams and Arduino into? You would then get faster data transfer and could maybe use power over Ethernet to drive the ROV but have on-board backup battery.
Logged


Offline Offline
Newbie
*
Karma: 0
Posts: 19
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Ip cameras cost a lot. Probably it is better to have a normal web cam for driving and in the fututre we'll buy something for recording in hq. Like go pro cameras.
Logged

USA
Offline Offline
God Member
*****
Karma: 14
Posts: 644
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Ip cameras cost a lot. Probably it is better to have a normal web cam for driving and in the fututre we'll buy something for recording in hq. Like go pro cameras.

While it's always nice to have a clear picture for navigation, standard quaility web cam is probably sufficient.  Although you'd have to create your own water-proof housing here's an example of HD camera with a built-in microSD card drive and designed to be easy to interface with microcontrollers or other control circuitry.  Something like this would at least allow you to record in HD for later access, even if a live HD feed is impractical right now.
Logged

Offline Offline
Newbie
*
Karma: 0
Posts: 19
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

I bought a logitech c170, non hd. It works without problems with the cable we have.
I can send serial to arduino mega while The webcam is working.

I think the topic is resolved.

If you like you can follow the project on twitter (https://twitter.com/dip_ROV). I'm sorry it is written in italian.

Thanks to everyone!
Logged

Pages: 1 2 [3]   Go Up
Jump to: