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  1. wdariusw

    Yes another NEWBIE question!

    Hi. If you need low distance,as you mentioned 5m, you can use infrared, if distance longer you can use bluetooth or rf communication. If all motors are in one place you can controll them with one mcu. With all communication methods you can use UART. Cheapest realization would be using IR diodes.
  2. wdariusw

    Voltage from rotation

    But if i need that the signal would transmitted when there are proper direction? If cyclist pedals backwards , then no signal should be transmitted.
  3. wdariusw

    Voltage from rotation

    Will try it this week. Now I can't work with it day or two... If it needed to detect rotation direction, what sensor fits here? Hall sensor i think here can't help..
  4. wdariusw

    Voltage from rotation

    No. I have problem's with my knee..doctor will operate my in these days, very difficult to work, even sit... :/ please make simple drawing how you suggest me to turn magnets and coils, thanks !
  5. wdariusw

    Voltage from rotation

    Today's project - coil winder :D Now i can wind all coils with identical number of turns, coils are nicer, and sine wave on oscilloscope is with less noise. Coil winded with new winding method is in the right: There are 600 rotations using 0.2mm cooper wire. New coil gives about 30mV bigger...
  6. wdariusw

    Voltage from rotation

    Parallel ? I got 560mV when coils was in series...And another thing - rectangular coils would have bigger cross section..hm..will think about that tomorrow ! ! ;)
  7. wdariusw

    Voltage from rotation

    One thought about that orientation. Lets say i positioned coils that the magnets will pass it with same angle. But...I think the coil area is smaller than post #27 second picture. This will affect output. Or i'm wrong here ?
  8. wdariusw

    Voltage from rotation

    I saw that technique. I can do it stepper, can rotate stepper lets say 1000 turn, but it requires to spend some time and money for coil form and mechanical fixing to stepper axis..Maybe this is logic idea with stepper..
  9. wdariusw

    Voltage from rotation

    Gryd3, great advice ! Maybe then the signal would be with less noise and more magnitude ! It is very expensive to do differents magnets holders from PVC for every idea. I think will do PVC holder for coils, then i will achieve perfect orientation and minimal airgap between magnets, no matter how...
  10. wdariusw

    Voltage from rotation

    Today have bought 7x7x7mm N42 neodynium cube magnets. Will try to arrange magnets into Halbach array, hope to to that next week (need to buy new ring with holes for squared magnets). And if i use small coils with every magnet, than every second coil should be winded into different direction? Or...
  11. wdariusw

    Voltage from rotation

    It is very difficult to wind coils...And what about the coil inductance ? It is important or not ?
  12. wdariusw

    Voltage from rotation

    Do you say that this arrangement: would work better than this one ? [URL='http://postimg.org/image/vdb4dq5lr/']
  13. wdariusw

    Voltage from rotation

    I think the sine on oscilloscope was not perfect because of not ideal positioning of coils. And it is bad, that coils are differents ? Because when i winding it, there are a lot of turns, and i do not count it.
  14. wdariusw

    Voltage from rotation

    Merlin3189, will see tomorrow in electronics shop what they have of cores. I had thoughts about oscillator , but it is unreliable. What if two systems near each other? Fault... MCU is needed anyway, for transmitting proper pulse, maybe one bit for identification. I have also 0.15mm cooper wire...
  15. wdariusw

    Voltage from rotation

    Yeah, i saw Halbach array, but i have only cylindrical magnets now, so there are only two positions for the magnets. What is stronger than N52 ? Maybe bigger N52. There are another device with battery and i want to comunicate with him (thats why i need wireless). Perfect would be 8 pulses in one...
  16. wdariusw

    Voltage from rotation

    So...Starting from the beggining. I have "thing" which need pulses to work. Now the sensor looks like this: I want to do same thing WITHOUT battery and WIRELESS, or there can be battery, but it must be charged when axis is rotating. My idea is : magnets + coils act as generator for low power...
  17. wdariusw

    Voltage from rotation

    Tomorrow will post whole idea and photo what I have made now for that project ! ;)
  18. wdariusw

    Voltage from rotation

    This is another problem for the next steps, but now direction is not important .
  19. wdariusw

    Voltage from rotation

    Here is my setup. 22pcs Neodynium N52 6x10mm magnets around PVC 80x10mm circle. Every second magnet is reversed direction. Want to see magnetic field lines. Can anybody help to do that with QiuckField software ? :)
  20. wdariusw

    Making a DC electric Motor - Coil Wiring

    Here you go https://itp.nyu.edu/physcomp/lessons/dc-motors/dc-motors-the-basics/
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