Chat > Guides & Projects
ROV - Project underway
zpyder:
Figured the easiest option would be to use a 12v car charger battery type jobby on the surface. Less things to waterproof that way.
Something like this:
http://www.screwfix.com/p/ring-automotive-power-pack-jump-starter-12v/38140#product_additional_details_container
There might be some power loss down the line, but that should be ok for the motors (doesn't matter if they aren't running at 100% power I guess) - the router might have issues, but only needs 5v to power it, so it depending on how much power is lost down the line, I might put a 12->5v dc dc converter down there next to the wireless point.
zpyder:
Thanks for the link about the motor controller.
I was thinking something more like this:
http://www.musiclily.com/musiclily-5-way-pickup-selector-toggle-switch-black-m192.html¤cy=GBP&language=en?gclid=CP-JuOnAvrkCFYPHtAodXz4AIw
Middle point being off, the far points being "on", and the intermediate points being connected to some kind of transformer/resistor to reduce the power going to the motors? Bit cheaper than your option if its doable?
EG
Full + power / 50% + power / Neutral(off) / 50% - Power / Full - Power
zpyder:
SO FAR:
Frame built
Pontoons to be worked on in a bit
Camera has been sent to the wrong Depot by FedEx and will turn up tomorrow (hopefully)
30m Ethernet cable ordered
100m dual core speaker cable ordered
Bilge pump motors are proving tricky to source. Lots out there, but there seems to be a massive price difference between the UK and USA (nothing new there) and designs. Over here it seems to all be about whole pump assemblies. American stuff seems to be much more modular with replaceable parts.
Once the wiring, router and camera turn up I'll probably sort out the power source and switches. THEN, I should be good to try and put it together :D
knighty:
the problem with a resistor etc.. if that any time a motor is on, even if it's only going slow you'll still be using full power (and dumping the excess as heat) so you'll work through your battery pretty quick
you could get 24v pumps, and then use 6 volt batteries so you could run them at 6v/12v/18v/24v for different speeds.... but then the problem is you need to run 5 power wires down to the rov to power it
I'll have a hunt around as see if I can find any better motor controllers, how many motors will you be running ?
also, I've thought of a way to cheat to do reverse, so you only need one controller per motor
will you be running it from land or from a boat ?
500watts at 12v is 41amps... at that power level a big car battery would last about an hour before it starts to die and an hour and a half till it's dead (if you're lucky)
wait... 500watts is a lot for a bilge pump... did you mean a 500gal/hour not watts ?
knighty:
http://www.ebay.co.uk/itm/BILGE-PUMP-SUBMERSIBLE-1100-GPH-12V-new-and-boxed-/180993395164?pt=UK_CarsParts_Vehicles_BoatEquipment_Accessories_SM&hash=item2a240c09dc
these no good ?
they're designed so the water it's pumping moves up around the motor (to cool it) and then out - you can just cut away most of the white plastic and you'll be left with the motor sticking with a shaft on the end for the propeller ?
(p..s my 3d printer should be here soon if you'd like propellers or other parts printing :-) )
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