seems it is no easy to find the 360 degree or even 270 degree?

 

seems it is no easy to find the 360 degree or even 270 degree?

Try this one:
https://www.aliexpress.com/item/100...-1;3.75;-1;41@salePrice;CAD;search-mainSearch

 

If you need more rotation than a standard servo gives, you can add gears externally. I have done that in a number of applications. These are geared down:

 

If you need more rotation than a standard servo gives, you can add gears externally. I have done that in a number of applications. These are geared down:

View attachment 262091

Thanks.
its a solution.
I am try to add a potentiometer, and I ordered some 270 degree and see.

 

Bought some thing like picture, how to add it into SERVO is no easy.

 

Bought some thing like picture, how to add it into SERVO is no easy.

I don't recognize any of the items in the pictures except the cables. What are they and what are you trying to do with them?

 

The top is a photo interrupter with an encoder, the bottom, I think, is a 360° trimmer for rotation angle sensing.

 

I don't recognize any of the items in the pictures except the cables. What are they and what are you trying to do with them?

Well, seems it is not easy to explain all story.
simple they are rotate encoder trying to use to count the SERVO rotate degrees.

 

The top is a photo interrupter with an encoder, the bottom, I think, is a 360° trimmer for rotation angle sensing.

yes.
the thing is there is no room for them as the picture shown in #16.

 

yes.
the thing is there is no room for them as the picture shown in #16.

Maybe this would help.

 

I would offer some suggestions but I have no idea what you are trying to do.

 

I would offer some suggestions but I have no idea what you are trying to do.

My inference is that he wants a wide range positionable servo so he is trying to take a continuous rotation servo and instrument it so he can manage the position.

I don't know which library he could use for that but in principle it seems doable.

 

My inference is that he wants a wide range positionable servo so he is trying to take a continuous rotation servo and instrument it so he can manage the position.

I don't know which library he could use for that but in principle it seems doable.

I think the standard servo library would work, as the servo only uses three commands. Move servo clockwise, counterclockwise and stop. With the encoder, he’d start the servo moving, count the pulses and stop the servo when it is in position. Note that with an encoder, the number of positions is limited.

I thought the solution presented by KeithWalker was the best one based on my understanding of the TS requirements.

 

I built this ultrasonic distance sensor some years ago. It plugs onto a Uno like a shield. The servo rotates 90 degrees in 1 degree steps, rotating the platform 180 degrees and the software plots the position of the echo on a semi-circular display, something like radar. To get the exact rotation of the servo, it is geared to a feedback potentiometer that rotates 270 degrees. This may give you some ideas for your project.
.

 

I built this ultrasonic distance sensor some years ago. It plugs onto a Uno like a shield. The servo rotates 90 degrees in 1 degree steps, rotating the platform 180 degrees and the software plots the position of the echo on a semi-circular display, something like radar. To get the exact rotation of the servo, it is geared to a feedback potentiometer that rotates 270 degrees. This may give you some ideas for your project.
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View attachment 262469View attachment 262470

Would you happen to have a ultrasonic distance sensor schematic to go along with the wonderful photos by chance, please.

 

Would you happen to have a ultrasonic distance sensor schematic to go along with the wonderful photos by chance, please.

It looks like the ultrasonic distance sensor is a Parallax Ping))) sensor or a clone. It’s a popular sensor but not the only one. It can be hacked into a triangulation sensor as described in this article.

 

Would you happen to have a ultrasonic distance sensor schematic to go along with the wonderful photos by chance, please.

I bought it ready assembled from AliExpress. The shipping cost more than the sensor!
https://www.aliexpress.com/item/1005002865081276.html?spm=a2g0o.productlist.0.0.39bf4beentYAts&algo_pvid=702de13e-430f-4090-94a0-f715b3a0525b&aem_p4p_detail=202203101239247067322858168760020188777&algo_exp_id=702de13e-430f-4090-94a0-f715b3a0525b-2&pdp_ext_f={"sku_id":"12000022518420992"}&pdp_pi=-1;1.13;-1;-1@salePrice;CAD;search-mainSearch

Here is a tutorial on how to use it with ann Arduino:
https://create.arduino.cc/projecthu...c-sensor-hc-sr04-with-arduino-tutorial-327ff6

 

I would offer some suggestions but I have no idea what you are trying to do.

Thanks.
I just looking for a large rotate angle (~300 degree?) SERVO for ultrasonic scanner.

 

My inference is that he wants a wide range positionable servo so he is trying to take a continuous rotation servo and instrument it so he can manage the position.

I don't know which library he could use for that but in principle it seems doable.

Thanks.
Yes, what I have in hand are 180 degree SERVO, I ordered lot of 360 degree SERVO when I saw that products on aliexpress, but that is really not SERVO at all.
They removed the potentiometer inside and just continually running without possible to control the position.

 

I built this ultrasonic distance sensor some years ago. It plugs onto a Uno like a shield. The servo rotates 90 degrees in 1 degree steps, rotating the platform 180 degrees and the software plots the position of the echo on a semi-circular display, something like radar. To get the exact rotation of the servo, it is geared to a feedback potentiometer that rotates 270 degrees. This may give you some ideas for your project.
.
View attachment 262469View attachment 262470

Thanks for the idea.
I like to find if there are products on market.