Data Sheet

To make the contact, stick the two exposed pins into the two holes of the learning mode jumper and then tilt the tool

towards the side and press on it to ensure a good connection with the inside edge of each hole. It is not sufficient to

just rest the tool on the learning mode jumper; you must tilt it and apply some force.

Pololu 4-Channel RC Servo Multiplexer (Assembled),

labeled pinout.

For the Pololu 4-Channel RC Servo Multiplexer, the learning mode jumper consists of a pair of exposed pads on

the component side of the board. An alternate learning mode jumper is available on the other side of the board and is

labeled “LEARN”; you can use whichever jumper is more convenient. To connect the two pads, you can use a wire,

screwdriver, or some other conductive tool.

9.1. General Configuration Procedure

This is the general procedure for configuring the device. To follow these instructions, you will need to know how to

connect and disconnect the learning mode jumper, as described in Section 9.

1. Get the device into learning mode. In order to do this, power off the device, connect the learning mode

jumper, and then power it on. After it is powered on, disconnect the learning mode jumper. At this point, you

will see the indicator LED fading in and out with a period of 1 second. Your device is now in learning mode,

and will be until you next turn off the power. In learning mode, it will not turn on the relay. If you want to abort

learning mode, you can power off the device at this point and none of your settings will change.

2. Tap the learning mode jumper (connect it and then disconnect it). This restores all of the settings in the device

to their default values; the threshold will be 1696 μs and inversion will be disabled. The indicator LED should

be blinking a different pattern now. If you want to use the default settings and exit learning mode, you can power

off the device at this point and skip the instructions below.

3. Now the device is in the pulse-measuring phase of learning mode. This is where you can choose what

threshold to use.

◦ If you want to use the default threshold, you should not send RC pulses to the device. The device will

indicate that the RC input signal is not recognized by blinking the LED with a 50% duty cycle and a period

of 0.5 s.

9. Configuring Your RC Switch Page 33 of 35