DC-engine

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hello, i´m starter , 1. project => i´m trying build rc-car control via serial connection, includes 3 servos + dc-engine. i´ve written software on arduino uno (, way) + on pc , can control servos well. today i´ve added dc-engine control , presumed dc-engine + servos can´t controlled on 1 board without external power supply because when start engine, @ level of power arduino switches off, because load draws much. i´m thinking of external circuit, powered 11.1 volts battery pack. want control via transistor digital pin arduino (pwm), question transistor recommend job?

thanks in advance!!

bipolar transistors come in 2 flavors: npn , pnp.  because switching voltage higher arduino's supply voltage want use npn transistor between the load (motor) , ground (the negative side of battery.

here tutorial using transistor switch: http://www.electronics-tutorials.ws/transistor/tran_4.html

transistors rated maximum voltage can safely switch , maximum current can safely carry.  you need 1 can handle 11.1v , many amps stall current of motor.  there value called "beta" or "current gain".  this ratio of how current passes through transistor how current feed base.  you can safely feed 0.030 amps (30 ma) arduino pin transistor current gain of 100 can pass 2 (0.02 * 100).  if need higher current need higher current gain.


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