Above is an outline of my current thinking on the electronics.
I an know planning on adopting the openROV.com code/ architecture for the electronics. To reduce video lag and stay connected to the openrov community.
I’m struggling to find a 48v dcdc step down converter that will deliver 12v 20a on output. I could just run the tether at 32v and reduce the power at the ROV and use a standard converter. Or maybe run the tether at 48v AC and step down with a transformer?
Improved tether or… (needs to be low cost)?
Transmitting power at 48v will minimize the voltage/power drop over the tether cable making more power available at the ROV while keeping the voltage at a safe level for use in water. By reducing the total cable length and/or increasing the conductor area it will be possible to have more control over the voltage drop.
I would like to see all the ROV’s power delivered by the tether but it would be possible to swap out LIPO packs during the working day.
But latency might be a problem with the IP cameras?
I’m still looking at pressure sensors. I would like internal and external pressure sensing but at £26 each the OPENROVS MS5803-14BA feels a bit pricey. Some pressure transducers on ebay rated to 150psi/100m are around the £13 mark and might be sensitive enough.
The other components are are all standard of the shelf components that are fairly inexpensive, and could be replaced easily.
Plenty more to think about…