I have a car with a split hood that opens with 12VDC linear actuators, using momentary switches. I want to automate this using the remote control I use for my car doors, since I have two spots available. The hood has to open in a particular sequence, drivers side first, because this part overlaps the other part. I worked out the sequence with wire logic but it is horrendous. I want to use PWM to open and close the hood(s). I've already worked out the flowchart and details regarding sequencing,etc.
I have no feedback from these actuators, no pot to tell me where they are, and if I go past the extents I could wreck my hood or the actuators. My question: if I use PWM (or something else you might think of), can I count the pulses I send to the actuator and use that number for my "soft-stop"? Could I just send 3440 pulses (for example) to the actuator to fully open the hood? or 1720 pulses to open it halfway? How repeatable would this action be?
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It would be very difficult to install hardware feedback devices.
For backup protection I would/could/will put in limit switches on both ends to perform an emergency stop.