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Controlling 3 Servos With The Servo:Lite board

By default the Servo:Lite board for the :MOVE mini buggy kit is capable of driving its 5 ZIP LEDs in conjunction with two servos. In this resource for the Servo:Lite board we are going to cover how you can ‘hack’ the board to facilitate the driving of three servos.

servo_lite_with_servo

It’s important to note that we included this as a feature and as such we ensured that not only is the ‘hack’ very easy to do, it is also easy to reverse. Also, the ‘hack’ disables the onboard ZIP LEDs, reversing the ‘hack’ re-enables the ZIP LEDs again.

Both the ZIP LEDs and the servos are controlled from outputs on the microbit. The Servo:Lite board only breaks out P0, P1 and P2 to drive things. So, if we want three servos we need to disable the ZIP LEDs.

Presentation1

As you can see in the above image, the ‘hack’ is a simple three step process;

1. Create a soldered joint across the two pads on the front of the board.
2. Break the track between the two pads on the rear of the board.
3. Add 3 x 0.1” header pins to the board for the extra servo to connect to.

To return a ‘hacked’ board back to its original state just reverse the process;

    • Remove the soldered joint on the front of the board.
    • Create a soldered joint across the two pads on the rear of the board.

 

Servo:Lite And microbit Pin Assignments:

The table below highlights the pin assignments that you will need to be aware of when writing your code.

microbit. Servo:Lite.
Pin 0. ZIP LEDS or Servo 3.
Pin 1. Servo 1.
Pin 2. Servo 2.

 

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8 thoughts on “Controlling 3 Servos With The Servo:Lite board”

  • Habong Lee December 2, 2017 at 3:10 am

    Hi What is the PIN number for Servo 3?

    Reply
    • Mark Donnison December 7, 2017 at 1:17 pm

      Hi, Pin0.

      Reply
  • Dan March 2, 2018 at 12:09 pm

    Hi

    When it says "Break the track" between the two pads, what is it actually referring to? The black separating line between the pads?

    Thanks

    Dan

    Reply
    • Mark Donnison March 5, 2018 at 3:29 pm

      Hi Dan, The track is under the black silkscreen (top layer) on the PCB. If you tip it under a light you should just be able to see it. Give it a good scratch (gouge) to separate the two pads, we typically use a screwdriver or craft knife for this.

      Reply
  • Ms.Kim November 15, 2018 at 1:44 am

    Hi!
    I have a question about the Servo:Lite board.
    Is it possible to connect with other sensor besides servo motor?
    And how do I turn on the Zip LED? Sometimes when I attach it to the micro-bit, the light goes on. I want to know why.

    Reply
    • Mark Donnison November 29, 2018 at 2:51 pm

      Hi, we have an interface board for adding a sensor: https://www.kitronik.co.uk/5628-move-sensor-interface-board-for-the-bbc-microbit.html With regards to the LED coming on, if it is connected to the microbit properly and there are no shorts the LEDs should not come on unless you write code to make that happen. If this continues to be a problem, please contact support@kitronik.co.uk who will be able to help you troubleshoot the issue.

      Reply
  • Robert Yusko November 29, 2018 at 5:26 pm

    Is there any type of modification to allow both the trailer dumper and the bulldozer to work on one Move:Mini?

    Reply
    • Mark Donnison December 7, 2018 at 9:37 am

      Hi Robert, the board itself can only handle three servos, two for the wheels and one for an add-on. We do have an interface board add-on but that is specifically for adding sensors to :MOVE mini. Please note that if you have some crazy hacks in mind, and who doesn't!, there is the potential to damage the boards. But for now at least, it's either trailer or bulldozer, not both. Sorry!

      Reply
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