I found cpwlibrary, which supports up to 1/64 step mode, and I built a simple driver... with a 200 step motor it supposedly can give 12800

It IS very smooth - though I can't tell if it's really 12800 discrete and precise steps as I can't really test it properly ATM as I lack space and it's almost midnight

Guess I just found use for that laser module I bought a while ago

Does this have to be Real Smooth for Video, or are these still shots??

The smoother the better. I think you're trying to suggest a geared dc motor? they might be more suited for smooth motion - I know


I've spent an hour trying to find worm gears on the internet and the cheapest I are 15$ each - so 30$ total. that's what I meant when I said they are hard to source 
I am starting to see an emerging pattern - the mechanical side of any project turns out to be the most expensive 

I can get the 28BYJ-48 motor for about 4$... Not sure if that's becausethey are:
A)low quality and not very precise
B)made in china
ohh well anyway 8$ for too motors is dirt cheap so I might as well give them a try

dude you're awesome - that's exactly what I need
it even has a parts list

Never considered a worm gear... in fact I didn't want to use gears at all because they are hard to find, but I guess I don't have other choice

Is there any noticable backlash??
Have you tried using it for long range photography??

Hi, I want to build a high accuracy pan tilt turret
The thing is I want it to be very accurate and usable at longer ranges
0.1 miliradian (~ 0.4 MOA for those not familiar with metric units) accuracy is expected - obviously the less the better.
Speed isn't really an issue - if it can do 0.5 RPM max it's ok

Mechanicly it will look something like this :


I got two options:
A)the 28BYJ-48 motor with an inbuilt gearbox (5.625 deg/48 = ~0.087deg per step) - not ideal but could be further geared down with a belt gear and it has got plenty of torque

B)typical 200steps per rev step motor but microstepped to 1/64 or 1/128

What would be better in your opinion ??
Is it even possible to microstep the 28BYJ-48 motor? How accurate are microstepped motors ?

Did you use a bluetooth dongle and putty to check what is sent by both the phone and the arduino ??

Do so and you should see what's wrong 

wow amazing work

you're the coolest dad ever

please am also interessted with temp aplication , can u send me the code for the application , as you know i cant download from speedy

The source file can be downloaded from my google drive - the link is in my previous post

it's a zipped file - you have to upload it into app inventor

another thing , i am trying to make my arduino read the device if its on or off , and to read it and then send the data to my phone throughout bluetooth .if its on the text tv is grean , if its off the text " tv" is red , so a user for example will not turn off a device witch is already off . do u think its a good idea ??

That's doable - just write arduino sketch that reports the state of the TV through bluetooth

Try this link -> https://drive.google.com/folderview?id=0B_PfPoEotOF8N2JwT3RSX011SjQ&usp=sharing

it has to be uploaded (the entire zipped file) into app inventor

more on it here -> http://appinventor.mit.edu/

The source file can be downloaded here -> https://drive.google.com/folderview?id=0B_PfPoEotOF8N2JwT3RSX011SjQ&usp=sharing

Note that source files have .ZIP extension. That's why you didn't notice it. I describe how to upload them in this video
https://www.youtube.com/watch?feature=player_detailpage&v=Y-iDuUQCxQA#t=126s

Did you try to establish connection between the phone (app) and a computer to see if it works ?? it should work just fine.

i tryed to comunicate with bluetooth by serial monitor .. it didnt work , as for Putty i tryed it it also didnt comunicate

even if the baud rate is wrong you still get something on the other side - just a bunch of characters that make no sense

There must be some other problem - I assume it's either wiring or slave/master setting

i tryed AT and +++ ,, waiting for an OK .. also nothing happen

All bluetooth modules that I've seen require you to send AT commands through FTDI adapter not directly through bluetooth SPP.




Not sure if that's the module you have but I found this ->
http://ftp://imall.iteadstudio.com/IM120417010_BT_Shield_v2.2/DS_BluetoothHC05.pdf

Also I found this thread that you might find useful -> http://arduino.cc/forum/index.php?topic=100008.0;wap2

First of all you can't have the bluetooth module connected to RX and TX when you upload code - upload code and then connect them.

Secondly, the module you have might be set to different default baud rate - you either have to change it (using AT commands) or modify arduino code to use the module default baud rate.

What's more, make sure that the module is set as master. The datasheet should have some information on that.


Finally, use a USB bluetooth dongle and program such as Putty to try to establish connection with the module and android device. In this way you can manually send and receive commands and see if the module and/or android device works as expected.

Here is a link to the files ->
https://docs.google.com/file/d/0B_PfPoEotOF8WEwyUVhkWnY3b00/edit?usp=drive_web&pli=1

or try this if it doesn't work
https://drive.google.com/folderview?id=0B_PfPoEotOF8N2JwT3RSX011SjQ&usp=sharing

You have to copy and paste arduino code into arduino IDE and then upload it to the board

You're right about speedyshare - you can no longer download the files for free
I'll try to upload them somewhere else

I don't really understand the question... could you be more specific ? I know English is probably not your native language but I can't really tell what's the problem