I am new to Arduino, and need some help with a circuit that needs external power.
I have an Arduino Mega ADK or / and an Arduini UNO. I want to run a small vibration coin with it. It is specified here: http://www.sparkfun.com/datasheets/Robotics/310-101_datasheet.pdf The vibration motor runs from 2-3.6V starting at 85mA with an internal 75Ohm terminal resistance.
I also have an NPN transsitor an some Diodes (Rectifier, Zener). Up to now I Understood ishould connect
- The base is connected with an 1kOhm resistor to an output pin of the arduinio
- The emitter is connected to the Arduino ground nearby the 5V pin
- To collector is connected to the vibration motor. The vibration motor is connected to the arduini 5V pin
Is an external power supply really needed for this motor? What componenten are aditionally needed in the circuit? Do I need any more resistors? Any diodes?
Thanks, best regards filyra.