Thank you for your response. The sensor I am using is an IP68 rated ultrasonic distance sensor. I attached an image of it here.Hello!
It's not easy to reply.
- No info about the sensor. Is it a plain transducer, or is it a module with output wave and input echo, etc, etc
- No clear idea of what you want to do in "automatic" mode. Move the motor, and once at a certain distance move back?
Any tolerance of the movement? Any security requirements? Suppose it's a drill, which works in automatic mode. Do you
have any security requirements (make sure that nobody's hand is under the drill)?
Beside this, I'm not sure anybody will reply, at least not for free. You come with a bunch of components, and you are
asking the forum to make your design. What about starting to actually do something, in which case it would be easier
to help you on specific matters rather than doing a full project.
Dora.
Hi, thank you for the response.It's unclear what voltage and current levels your linear actuator responds to, either: a) On-Off power from wiring, or b) range of voltages coming from sensor or potentiometer inside your foot switch.
In the neighborhood of the linear actuator, you must condition each incoming source so its signals are acceptable to the actuator. Almost certainly this means amplifying signals from the ultrasonic sensor.
The SPDT switch has a center post (electrically speaking). By pushing to either side you connect it to one of the two remaining posts. The diagram makes it appear easy to follow however it's unclear exactly how many individual center posts are inside your rocker switch.
Thank you for the response.
- I assume vertical speed is fast enough to clear rock at trolling speed.
- I hope you understand the ultrasound will not work thru a metal hull. Fiberglass OK.
- You will need to spend a lot of time decoding the sensor data decoding a rock in writing a program.
- A flat surface creates the strongest reflection range of 5m while a rock will be proportionally less S/N.
- Any mounting bracket vibration will further reduce sensitivity.
- Beamwidth is often 50 deg of Tx/Rx sensors so forward tilt of the same is required or in-hull if fiberglass.
What is the DC resistance of the servo motor? This defines surge current.
You have a lot more to figure out how it can fail to make it work.
Thank you for the response. I would like to keep the sensor and microcontroller set up because this project needs a level of 'complexity' that the sensor brings.You might "lose" the ultrasonic ranging requirement
if you just used armature current as a load "sensor"
(probably you will need some blanking at motor
start, though, to ride out the starting torque bump).
I don't believe this application needs a uC at all.
Just limit switches and an latch-off or fast acting
overcurrent protection that overrides the "go"
switch. That could be a dumb ol' transistor and
sense resistor, opening a NC relay in series with
the "go, then see if you get in a bind" switch. Or
something.
Yes I just posted an update where I tried to wire the foot switches into an IBT-2 and two IBT-4s, but had no luck with the foot pedal. I did switch the foot pedal out for a trim tab switch to use as a foot pedal instead and I had luck with the two IBT-4s. The up and down on the trim tab controlled cw and ccw motor rotation, I just might need to simplify it to the single IBT-2 and then figure out how to wire in a mode selector like the 7 pin rocker switch or something like that. I also have to figure out how to wire the motor so that it will raise/lower in both automatic and manual modes.Two foot switches...
I guess each is simple On-Off type? Carrying up to 20 Amperes?
Since there's two of them it sounds as though you must devise your automatic system to produce its own similar set of signals. Say your automatic device outputs one signal... then you must split that signal to two relays (or two transistors). Energize one or the other, while most of the time both are Off.
You just may have sufficient tabs on your rocker switch to adapt it to your purposes.
There's a caveat: You must explore the wiring to locate ground wires in your manual system. Avoid sending heavy current directly to the 'common' wire (or ground wire), and avoid sending it in a reverse direction to devices that would be ruined. Your automatic system must be constructed so its wiring is compatible with your present system.
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