Hello Everybody.
Finally I discard using brushless motors since I dont understand them. So I am going to use a DC Motor for my project.
**broken link removed** (sorry, in japanese)
to do this I have several questions.
1) First. I am thinking of using a chip with an h-bridge (Toshiba TA7257P)
TA7257P pdf, TA7257P description, TA7257P datasheets, TA7257P view ::: ALLDATASHEET :::
What are the advantages or disadvantages of using this as opposed to doing it myself with transistors and diodes??
2) talking about simple circuits (not h-bridge) take a look at the attached picture
2a) is R2 really necessary? i got some docs saying it is , other saying it isnt
2b) is D2 necessary?
2c) some book recommended putting a condenser in parallel to D1, but I wonder if that is a mistake of the book
3) Talking about the circuit in 2 and also about the H-bridge (either the chip or the one built with transistors) since this motor is 6~12V, should I use an opto-coupler to separate the chip from the motor as I did in my previous project?
btw, when the datasheet of the motor said 6~12V does that mean that I have to put 12V and only get the 6 V through PWM the signal from the microcontroller???
Thank you very much for your help
Kansai