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Introduction

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.

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

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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.
  • 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.

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

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

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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.
  • 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.

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A good solder joint should be shiny.
  • A good solder joint should be shiny.

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Use flush cutters to trim the sharp point.
  • Use flush cutters to trim the sharp point.

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

  • Cut them to about 20cm in length.

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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.
  • 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).

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

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Strip the other end of the wires.
  • Strip the other end of the wires.

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Insert the wires into P3:
  • Insert the wires into P3:

    • Red wire coming from T20 into P3+

    • Black wire coming from T21 into P3-

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

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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.
  • 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.

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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.
  • 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.

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Strip the wires
  • Strip the wires

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

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

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

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

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Make sure your multimeter is measuring resistance.
  • 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.

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

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

the two lights in the same cable?

Marcos giordano - Reply

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

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Make sure the adhesive comes out of each side.
  • Make sure the adhesive comes out of each side.

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

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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.
  • 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.

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Finish Line

One other person completed this guide.

OpenROV

Member since: 09/28/2013

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3 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 -

Hello Im building the Open Rov 2.8, I have the two external light cubes. Starting at the step 27 ((If you have an OpenROV v2.8 you will use the colored wires: (+) purple wire with red stripe, (-) purple wire with black stripe.))) where i should connect the second light cube?

thanks for your help

Marcos giordano - Reply

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