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sparkfun WIG-13872 Hook-Up Manual

Continuous rotation servo trigger
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Page 1 of 13
Continuous Rotation Servo Trigger Hookup
Guide
Introduction
When we introduced the regular Servo Trigger, we mentioned that it could
be reprogrammed to be more useful with continuous rotation servo motors.
However, reprogramming the firmware is somewhat tedious, and users
asked for a Servo Trigger preprogrammed with the continuous rotation
logic.
You asked, and we listened! Introducing the Continuous Rotation Servo
Trigger! The name is a mouthful, but if you're looking for an easy way to
deploy continuous rotation servos, it should be exactly what you're looking
for.
The Continuous Rotation Servo Trigger

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Summary of Contents for sparkfun WIG-13872

  • Page 1 Page 1 of 13   Continuous Rotation Servo Trigger Hookup Guide Introduction When we introduced the regular Servo Trigger, we mentioned that it could be reprogrammed to be more useful with continuous rotation servo motors. However, reprogramming the firmware is somewhat tedious, and users asked for a Servo Trigger preprogrammed with the continuous rotation logic.

  • Page 2: Suggested Reading

    Page 2 of 13 Like its sibling, the Continuous Rotation Servo Trigger allows you to control a hobby servo motor without any programming. The servo speed and direction are adjusted using trimpots, and the direction can be changed by attaching a switch. In this guide, we’ll show you how to quickly get your CR Servo Trigger working, then discuss some of the finer details of using and configuring it.

  • Page 3: Getting Started Quickly

    Let’s jump in and build a circuit to show how the Servo Trigger works! Materials and Tools You’ll need to following materials to build this example circuit found in this tutorial. SparkFun Servo Trigger - Servo - Generic High Torque Continuous Rotation Continuous Rotation (Standard Size) ...
  • Page 4 Page 4 of 13 Break Away Male Headers - DC Barrel Jack Adapter - Right Angle Female  PRT- 00553  PRT-10 288 You’ll also need some hookup wire and a small screwdriver. Doublecheck The Trigger Before we start building, doublecheck that you’ve got a Continuous Rotation Servo Trigger.

  • Page 5: Theory Of Operations

    Page 5 of 13 Power Jack Closeup Take your right-angle male headers, and snap of a section of three headers. Solder the 3-pin header to the three pads on the end the board, and plug the servo into the the header. Be careful to get the plug oriented correctly –...
  • Page 6 Page 6 of 13 The Servo Trigger consists of two major engineering deliverables, the hardware design, and the firmware. The hardware is actually the same for the regular and continuous rotation boards, but they’re loaded with different firmware, tailoring the board’s behavior to each type of servo motor. Both sets of deliverables are in the Servo Trigger Github repository.
  • Page 7 Page 7 of 13 The Servo Trigger has two different servo control modes, selected with solder jumper 1 (SJ1). They can be used to tailor the response of the board for different applications. The default mode implements toggling control. The trigger initializes driving the servo as instructed by trimmer .

  • Page 8: Power Notes

    Page 8 of 13 If SJ2 is closed, be careful about powering up the Servo Trigger when the input is not connected to anything. When the input is floating, it can randomly jump between active and inactive and may cause the motor to behave unpredictably.
  • Page 9 Page 9 of 13 Lacking an old-fashioned rollerskate to dismantle for the chassis, we started with a commercial camera skate dolly. Polymer Lithium Ion Battery SparkFun Power Cell - LiPo - 2000mAh Charger/Booster  PRT- 08483  PRT-11 231 SparkFun Servo Trigger -...
  • Page 10 Page 10 of 13 Jumper Wire - 0.1", 2-pin, 6"  PRT- 10367 We also had some derelict robot parts around the workshop that we used to hold everything together. We improvised using materials we had handy and suggest that you do the same! Build the Circuit To start, we assembled the circuit on the workbench.

  • Page 11: Mechanical Integration

    Page 11 of 13 We plugged the 2 pin jumper wires into the pins on the switches and stuck some long pin headers through the switch contacts on the trigger PCB, so the switches could both plug in in parallel, one from above, the other from beneath.

  • Page 12: Testing Results

    Page 12 of 13 The bracket channel was simply placed over the axle bolt on the cart chassis. A rubber band was looped around the assembly, putting tension on the servo, so that the drive wheel gently touched one of the skate wheels.
  • Page 13 Page 13 of 13 • If you’re looking to control standard hobby servos, we also offer the Standard Servo Trigger, and a wide variety of standard servo motors. SparkFun Servo Trigger https://learn.sparkfun.com/tutorials/continuous-rotation-servo-trigger-hookup-guide/all 6/8/2016...

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