Here is the tower pro site but the shipping is really high
https://www.towerpro.com.tw/about-us-2/
Do you need a 1 degree accuracy?
With a 10us deadband you can reliably move the servo in 100 steps.
So you would use writeMicroseconds in 10us steps.
will try to exchange the setPWM functions in the code with writeMicroseconds and will update.
Also making the system more rigid (more heavy based - the base now is a thin wood square).
when trying to map the cues I was actually in need of 1 degree accuracy but maybe my setup can be closer and then then the error margin will be bigger. (if I understand optic-mechanic relations correctly)
Thank you for your help and comments!
I have run a laser maze for Hallowe'en every year since iirc 2015. Aiming lasers at mirrors is extremely difficult. I use one mirror per laser, four lasers. Were I you, I'd stick to something like that if possible and use more lasers, switched on and off as required.
More than one mirror is near impossible to keep on target (I use cheap 4*4 inch handheld makeup mirrors).
Mind you, my end target are CDS (LDR) sensors, not sure how small your end targets are.
You are using "front surfaced" mirrors, arn't you? Otherwise you get two reflections slightly offset.
I get this and wish I didn't. What's a better option, please?
The only option is front surfaced mirrors like everyone else uses!
C'mon, man. I'm no astrophysicist. You mean just regular old mirrors? 
No, I mean front surfaced mirrors that are used in every laser product. I used to have some that came from laser printers. All the laser sensors used in your grocery store bar code readers use front surfaced mirrors.
Oh, the ones I ripped out from the "holiday light projectors" to get a solid beam?
It shows them halfway through, green lasers (there's a little button on the back to pick between red and green)
https://youtube.com/shorts/vDe4DK8iRxI?feature=shared
If you really need 1 degree accuracy then you will need a good quality servo but they are not cheap.
I have purchased servos in the past from Tower Hobbies and Amain Hobbies.
I have only purchased Futaba and Hitec brands and both are highly reliable and precise. There are certainly other brands but since I have never used them I cannot comment on the quality.
Both great choices from my experience, too. I would also add Savox to a list of good quality servos.
looks amazing
didn't found in the price range i was hoping for 5-10 dollar for one motor (because i need to buy 12)
on Wednesday and Thursday i will do a series of tests including changing the code to writeMicroseconds and also tape the boards to the floor to make the all system more steady.
if i will fail after those tests I think I will upgrade to:
because of the great 1us dead band gap width.
That one looks good
So, A few videos after tests.
So this is how it looks after modeling with the first code:
sometimes the motors did have 1 angle response, sometimes they didn't.
this is the system playing 2 cues in the second code:
sometimes it was right sometimes off with a few tweaks, but not reliable and not efficient to tweak.
and this is the system with lights open moving, seems to be balanced:
thought about changing the 3d model.
but i think changing the motors will be a huge step forward..
Am I right?
The repetition to the same place, reliability and so on?
I'm a little skeptical about the 1us deadband specification for a servo that cheap.
Also, Adafruit has this note:
"Note that the default servo pulse widths (usually 1ms to 2ms) may not give you a full 180 degrees of motion. In that case, check if you can set your servo controller to custom pulse lengths and try 0.75ms to 2.25ms. You can try shorter/longer pulses but be aware that if you go too far you could break your servo!"
also in the official website of tower pro:
and also here:
it says 1us , but here it says 10us:
don't know who to trust.. looking for reviews but none mention accuracy
will try and look for more reviews
I am not quite sure i understood the quote from Adafruit..
I don't mind not getting the full range but I mind being accurate and persistence
that is because I am a performance art student and all of this setup is part of a show
If it's high precision in your system you need beyond what any typical servo will provide, you're better off using stepper motors.
Also, just thought I'd mention this: bouncing laser light all over the place could potentially damage someone's vision if they take a beam directly in the eye. You know that, right?
Yeah I am aware thought that after I will see it work I will design the cues and transition so no harm is potentially caused..
maybe it is far fetched but ideally I hope to achieve this balance..
Open to other solutions but I found this aesthetic
critical for the show.. maybe I will let go.. will search for a pan tilt model using stepper motors.. is there a way to make them listen to angle and not steps?
Thanks for the help of you all..
EDIT:
thoughts about just doing 6 laser diodes (which is cheap)
And focusing on cues and safety and “vibe” maybe replicating the shapes with them as much as possible.. will update!
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