ok. because come across several little problems and questions in my [first] controlling-pwm-with-Arduino project, I'll ask them all :)
so first of all: I want program a composition in pwm for both dc motors and big light [say up to 100W or more].
1-- motor: for the dc motor I build an extra circuit for separate power supply according to a circuit which is provided quite a lot the internet like described here http://www.thebox.myzen.co.uk/Tutorial/Power_Supplies.html [+ I'd like to add a resistor between source and ground.] problem: it works [for a long period] without the 1k resistor, with it doesn't do anything. Do I need a lower resistor here? Do I demolish the Arduino and blow up the FET if I don't use a resistor?
2-- I would like to control 3 dc motors. Do I need 3 separate power supplies? [I have 12V/1A amps now]
3-- grounding. How do I make a grounding so that they don't affect eachother? Do I need to make a star grounding for these 3 motorcircuits? Is grounding only direct to the Arduino oké or does it need a piece of metal to drain?
4-- Light. Together with the motors I want to make a dimming composition for light. 3 times again. I'm not exact sure what kind of light - probably halogen, high Watt. To also do this with Arduino I think I found a nice solution for this: a Velleman K8064 kit and a capacitor will do http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1266079091 is it smart to use the same Arduino as for the motors for this? someone has experience with big lights and this Velleman?
5-- motor/light, motor/light,motor/light stay appr 3 meters from eachother. Is a thin wire from 1 Arduino/circuit/point reasonable?
who does the answers? ;)