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External Light Cubes

  • Author: OpenROV
  • Time estimate: 25 minutes - 2 hours
  • Difficulty: Moderate

This guide walks you through the steps to connect the OpenROV External Light Cubes to your OpenROV.

If you have an OpenROV v2.5, v2.6, or v2.7 you will need a couple of pieces of wire. They should be at least 20cm in length and be wire gauge 22 or 24. One piece each of black and red wire is best, but any color will work.

Tools (continued)

Edit Step 1 External Light Cubes  ¶ 

Image 1/1: '''OpenROV v2.5 or v2.6: '''1 external light

Edit Step 1 External Light Cubes  ¶ 

  • Before beginning please make sure you understand how many lights you can use on your OpenROV.

    • OpenROV v2.5 or v2.6: 1 external light

    • OpenROV v2.7: 2 external lights in parallel

    • OpenROV v2.8: 2 external lights in parallel

  • If you try and power more than the recommended number of lights, you can cause permanent damage to your controller board.

  • Please continue to the appropriate section depending on your version number:

    • OpenROV v2.5, v2.6, v2.7

    • OpenROV v2.8

Edit Step 2 OpenROV v2.5, v2.6, v2.7 Board Modification  ¶ 

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Edit Step 2 OpenROV v2.5, v2.6, v2.7 Board Modification  ¶ 

  • This section will walk you through the steps to modify your v2.5, v2.6, or v2.7 controller board. If you have an OpenROV v2.8 skip the connection section.

Edit Step 3  ¶ 

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Edit Step 3  ¶ 

  • In this guide we will use a v2.7 controller board. The process is the same for v2.5, v2.6, and v2.7.

Edit Step 4  ¶ 

Image 1/1: Row: Voltage (Vbat,5V,3.3V)

Edit Step 4  ¶ 

  • There is a grid with solder pads to select different voltages for the PWM channels.

    • Row: Voltage (Vbat,5V,3.3V)

    • Column: PWM channel

      • Counted from the edge of the board

  • The external lights will be powered from battery voltage (Vbat) and we want to activate channel 3 (PWM3). Therefore we want R32.

Edit Step 5  ¶ 

Image 1/1: The solder bridge is the easiest way to make contact.

Edit Step 5  ¶ 

  • To activate a channel, simply create a connection between the two pads. You can do this with a wire, 0 ohm resister, or connect them with solder.

  • The solder bridge is the easiest way to make contact.

  • Normally solder bridges are not wanted when soldering. They result from using too much solder. We are going to use this excess solder to create an electrical connection between the two pads.

  • A small soldering tip works best.

Edit Step 6  ¶ 

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Edit Step 6  ¶ 

  • A good solder joint should be shiny.

Edit Step 7  ¶ 

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Edit Step 7  ¶ 

  • Use flush cutters to trim the sharp point.

Edit Step 8  ¶ 

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Edit Step 8  ¶ 

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Edit Step 9  ¶ 

Image 1/1: Cut them to about 20cm in length.

Edit Step 9  ¶ 

  • Next you are going to need 2 pieces of wire.

  • Cut them to about 20cm in length.

Edit Step 10  ¶ 

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Edit Step 10  ¶ 

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Edit Step 11  ¶ 

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Edit Step 11  ¶ 

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Edit Step 12  ¶ 

Image 1/1: Solder one wire to T20. This will be the positive wire (red).

Edit Step 12  ¶ 

  • During your build you wired extra wires to the DB-25 connector, through the endcap where it was potted, and to the outside of your vehicle for external components. We are going to use the wires attached to pins 20 and 21.

  • Solder one wire to T20. This will be the positive wire (red).

Edit Step 13  ¶ 

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Edit Step 13  ¶ 

  • Solder the other piece of wire to T21. This will be the negative wire (black).

Edit Step 14  ¶ 

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Edit Step 14  ¶ 

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Edit Step 15  ¶ 

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Edit Step 15  ¶ 

  • Strip the other end of the wires.

Edit Step 16  ¶ 

Image 1/1: Red wire coming from T20 into P3+

Edit Step 16  ¶ 

  • Insert the wires into P3:

    • Red wire coming from T20 into P3+

    • Black wire coming from T21 into P3-

Edit Step 17  ¶ 

Image 1/1:

Edit Step 17  ¶ 

  • Route the wires in a convenient way to be out of the way of the BeagleBone Black and other components in your electronics tube.

Edit Step 18 OpenROV v2.5, v2.6, v2.7 Wire Marking  ¶ 

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Edit Step 18 OpenROV v2.5, v2.6, v2.7 Wire Marking  ¶ 

  • Next you are going to need to find the correct wires to connect the lights. If you have an OpenROV v2.8 skip the connection section.

Edit Step 19  ¶ 

Image 1/1: This example uses an OpenROV v2.6.

Edit Step 19  ¶ 

  • During your build you wires wires to the outside of the electronics tube and sealed them. Cut off the hot glue (v2.5 or v2.6) off the white wires or the heatshrink (v2.7) off the solid grey wires.

  • This example uses an OpenROV v2.6.

Edit Step 20  ¶ 

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Edit Step 20  ¶ 

  • Strip the wires

Edit Step 21  ¶ 

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Edit Step 21  ¶ 

  • You will need a multimeter to measure the resistance to find the correct wires.

Edit Step 22  ¶ 

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Edit Step 22  ¶ 

  • You are going to want Pin 20 (+) and Pin 21 (-).

Edit Step 23  ¶ 

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Edit Step 23  ¶ 

  • On the DB-25 put one probe on Pin 21.

Edit Step 24  ¶ 

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Edit Step 24  ¶ 

  • Put the other probe on different wires until the resistance reading reads ~1 Ohm.

Edit Step 25  ¶ 

Image 1/1: If you have a continuity check function on your multimeter you can also use that.

Edit Step 25  ¶ 

  • Make sure your multimeter is measuring resistance.

  • If you have a continuity check function on your multimeter you can also use that.

    • Here is a video that describes the process.

Edit Step 26  ¶ 

Image 1/1: Repeat the process for the wire that is connected to Pin 20 (+).

Edit Step 26  ¶ 

  • Make a mark with a sharpie on the wire that is electrically connected to Pin 21 (-).

  • Repeat the process for the wire that is connected to Pin 20 (+).

Edit Step 27 Connecting Your Lights  ¶ 

Image 1/1: If you have an OpenROV v2.8 you will use the colored wires: (+) purple wire with red stripe, (-) purple wire with black stripe.

Edit Step 27 Connecting Your Lights  ¶ 

  • You should now know which wires, positive and negative, you are going to connect the lights to.

  • If you have an OpenROV v2.8 you will use the colored wires: (+) purple wire with red stripe, (-) purple wire with black stripe.

Edit Step 28  ¶ 

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Edit Step 28  ¶ 

  • Strip end of the wire connected to your light cube.

Edit Step 29  ¶ 

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Edit Step 29  ¶ 

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Edit Step 30  ¶ 

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Edit Step 30  ¶ 

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Edit Step 31  ¶ 

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Edit Step 31  ¶ 

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Edit Step 32  ¶ 

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Edit Step 32  ¶ 

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Edit Step 33  ¶ 

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Edit Step 33  ¶ 

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Edit Step 34  ¶ 

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Edit Step 34  ¶ 

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Edit Step 35  ¶ 

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Edit Step 35  ¶ 

  • Make sure the adhesive comes out of each side.

Edit Step 36  ¶ 

Image 1/1: [http://openrov.dozuki.com/Guide/Update+Software+Image+From+SD+Card/90?lang=en|Step-by-step update instructions.|new_window=true]

Edit Step 36  ¶ 

  • In order to control your lights through software, you will need to update your system to software version 30.0.3.

  • Step-by-step update instructions.

  • You will now have two light bars on the top of your screen. The controls for the external lights use the "alt" key and the normal light controls.

    • To turn the external lights on at full power "alt"+"i".

Edit Step 37  ¶ 

Image 1/1: Connection methods that work well:

Edit Step 37  ¶ 

  • You can mount the cubes anywhere on your ROV depending on your needs. We would love if you shared your mounting ideas with the community on our Forum.

  • Connection methods that work well:

    • Hot glue.

    • Double sided tape.

    • Duck tape.

You're Done!

2 Comments

Hello, I'm a high school student currently building the OpenRov 2.8v but i have external light cubes i need to add but i can't seem to find the guide for it.. i found this guide but its for the 2.5v to 2.7v.... any suggestions

thanks for your help

Joseph Lawless - Reply

See step 27 "Connecting your Lights." This is where you will start if you have a 2.8

OpenROV -