Using a PIC12F675, up to 5 outputs can be switched sequentially using a standard Remote Control pulse input of between 1 to 2 ms. Although any RC channel input can be used, it is especially useful when used with the rotary knob channels (usually 5 and above on RC airplane remote). The knob can be rotated to a certain position, selecting which output relay will be turned on.

The example circuit shown below switches between 3 inputs to 1 output. Many different configurations could be created for specific applications. A larger PIC could be used for more switching outputs.