Sequential PWM signals from one switch

Hi guys,

Bit stuck on this one. I need help finding a solution, either out the box, or something I can build myself.

 

I want to use 4 EPM magnets, but I want to control them *sequentially* using a *single* switch.  The problem is EPM's run off PWM so a single input signal and single`switch is all I have.

I envisage it works like this:

Engage switch to generate a <1100 signal and unit 1 activates, then the switch is returned to 1500. The "black box" increments the output channel count by one. Enage it again, unit 2 activates. Engage again, unit 3 activates. And so on. Once it is engaged a 5th time, unit one reactivates.

 

Is there something off the shelf which will let me increment output PWM channels, based on the count of the input channel? Something like in the image I've attached? Or how could I build this?

Presentation1.jpg

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