Search found 17 matches
- Jul 18th, 2012, 12:20 pm
- Forum: Control Systems and Tethers
- Topic: Wire Gauge
- Replies: 3
- Views: 1949
Re: Wire Gauge
500' of Cat-5 for ROV control and also return video feed. Our power is on-board batteries.
- Jun 28th, 2012, 10:23 am
- Forum: Electronics
- Topic: DC/DC converter question
- Replies: 3
- Views: 2547
Re: DC/DC converter question
Marcus, you won't see an increase in the amperage on the output side of your converter. It will regulate the voltage, but not increase the output amerage. The 90% effeciancy is an indication of how much power is used (and wasted) by the converter itself, just to do it's job. To get an increase in am...
- Jun 26th, 2012, 6:13 pm
- Forum: Control Systems and Tethers
- Topic: Use of relay or mosfet
- Replies: 2
- Views: 1685
Re: Use of relay or mosfet
The heat produced from a MOSFET will depend on the amperage load of your motor. If your amperage load is just a few amps I doubt that you will have much heat. MOSFET's are very effiecient and produce far less heat than a transistor. I use IRF5305 (55v 31amp) MOSFET's on my circuitboards. The motors ...
- Jun 26th, 2012, 12:21 pm
- Forum: Cameras
- Topic: Major Camera Issues??
- Replies: 24
- Views: 10660
Re: Major Camera Issues??
If you're using a 120/12v DC power supply, the output may just be a little dirty. Check the AC voltage level at your camera connection. A good clean DC output should only show just a couple of AC millivolts. Putting a capacitor near the camera connection should clean it up if it's dirty.
- Jun 26th, 2012, 10:54 am
- Forum: Control Systems and Tethers
- Topic: Mounting control boards inside PVC pipe
- Replies: 4
- Views: 2519
Re: Mounting control boards inside PVC pipe
The PVC tube I use on my ROV is larger than yours @ 12" in diameter, and all of my circuit boards are approximately 2" wide, by 6" long, but this might still work for you. What I did was to glue two smaller 3/8" PVC pipes along the inside length of the main tube, one on each side...
- Jun 19th, 2012, 11:24 am
- Forum: Mission Footage
- Topic: Video footage of our ROV under the ice.
- Replies: 8
- Views: 7531
Re: Video footage of our ROV under the ice.
The depth sensor is a pressure sensor with 0-5 volts output. It's coupled to a PIC Processor's analog input and converted to feet in the software. I can get the actual part number for the sensor if your looking at using one.
- Jun 13th, 2012, 12:52 pm
- Forum: Control Systems and Tethers
- Topic: RS232 v RS485
- Replies: 8
- Views: 3328
Re: RS232 v RS485
I'm communicating using RS232 with a 16F877 Pic Processor in our ROV on 500' of Cat-5 cable and it's working fine. I'm using a laptop that's running MS Windows on the other end.
- Jun 11th, 2012, 12:19 pm
- Forum: Electronics
- Topic: Looking for switch to be used under water?
- Replies: 5
- Views: 2871
Re: Looking for switch to be used under water?
The reed switch idea is a great idea. Another way is to leave the switch mounted inside the sealed compartment and drill and thread a hole that fits a 1/2" PVC male threaded plug in the compartment directly over a toggle or slide switch. Take the plug out and use a screwdriver to flip the switc...
- Jun 5th, 2012, 12:37 pm
- Forum: Miscellaneous
- Topic: electro magnet
- Replies: 3
- Views: 2903
Re: electro magnet
Hi. Just curious, have you taken an amperage load reading on your batteries while your ROV is descending, to determine just how much of the batteries are being used up? We have 6 small sealed lead acid batteries on board our ROV and I have assended/descended the ROV to 80-100 feet many times during ...
- Jun 1st, 2012, 10:28 am
- Forum: Mission Footage
- Topic: The first dive
- Replies: 3
- Views: 3184
Re: The first dive
Great video and it looked like the ROV performed very well. Nice job!