Nice looking experiment. Good show!
You talk about photo-transistors, but the devices in your photo look like photo-voltaic cells?
True, sorry they are kind of solar cells. The datasheet to it you can find on this link:https://www.distrelec.com/ishop/Datasheets/olIXYS_Solarzellen_XOB17_EN.pdf
On my screenshot you can just see the values which I did without beaming on the solar cells. But the result is almost the same when I beam on them too. (Laserlight wavelength: 650 to 680 nM (10^(-9)M))
The strange thing is that I tried out three of them and could clearly read from the values when the beam was on them.
Couldn't you implement a "micro-stepping" scheme, either by using a driver chip that implements it, or by building a custom driver that can output a varying voltage to the coils (instead of the regular on/off scheme), to allow you to position the rotor between coils...?
Sounds promising and complex.
I will try to finish the project first with the Servos I got (http://www.adafruit.com/index.php?main_page=product_info&cPath=34&products_id=154
) and see if it would already work when I move the laser slowly. If that works I will maybe try to improve other things. But first I need to come to reach a finish (deadline next Monday).
Yes, but that would quadruple the complexity of the project and Fabitosh seems to have his hands full already.
Very true. But I'm still having fun
My written part will be on German, but I will link it here too when I've finished for the ones who are intersted and having a bit German reading skills.
I will try to connect an other 5th resistor (40k[ch937]) and just try to find the error. But if you already know it I'd be glad if you telled me
Thanks for your effort!