I want to use a high-torque servo to "pull" the cable to apply a manual brake. I have a DC signal that varies in level depending on input to it.
Most servos require a ~2ms square wave AC signal to apply constant maximum torque. How can I apply this torque with just my DC signal?
Ideally I want:
(small 0-2.5V DC signal) --> if it exceeds 2V, trigger relay to allow 5V higher amperage DC current to power servo --> pull cable to apply mechanical brake
What I need help with:
1) What kind of servo could be used? I need VERY high torque and cheap cost, but do not care at all whatsoever about precision/feedback/digital/etc. Should I use something else to accomplish this goal?
2) How do I set up this "gateway" that only triggers the relay if a certain voltage input is reached (it will always have *some* voltage reading, so it can't just be run straight to the relay)?
3) How do I power the servo with a DC current, as described above?