Feedback 360° Servo Test

It's time to test your servos' feedback signal connections.  If all is well, the example program below will cause the built-in LED on the Activity Board WX to blink on and off when you gently turn a wheel by hand.  

  • In BlocklyProp, create a new project named Test Encoders.
  • Build the project shown below. Be sure the Robot initialize block's drop-down menu is set to ActivityBot 360°.

  • Turn the robot's power switch (PWR) to Position 2.
  • Click the Load and Run button.
  • With your hand, gently twist the ActivityBot's left wheel. This movement should make the P26 LED turn on and off as you rotate the wheel.
  • Repeat for the right wheel.  Turning the right wheel should make the P27 LED turn on and off.

If It Doesn't Work

Here are some symptoms and causes:

P26 light stays off while turning the left wheel.

  • The left feedback signal wire may be plugged into the wrong pin on the P14 servo port.
  • The left feedback signal wire may be plugged into the P15 servo port instead.
  • The left servo's 3-pin cable might be plugged in backward.
  • The shunt jumper might be missing or incorrectly set on the voltage selector pins next to the P12/P13 servo port.

P27 light stays off while turning the right wheel.

  • The right feedback signal wire may be plugged into the wrong pin on the P15 servo port.
  • The right feedback signal wire may be plugged into the P14 servo port instead.
  • The right servo's 3-pin cable might be plugged in backward.
  • The shunt jumper might be missing or incorrectly set on the voltage selector pins next to the P12/P13 servo port.

P27 light instead of P26 light blinks while turning the left wheel (or vice versa).

  • The feedback signal wires are swapped! Switch the wires plugged into P14 and P15.