Pages: [1]   Go Down
Author Topic: Beginner questions (motors and transistors)  (Read 323 times)
0 Members and 1 Guest are viewing this topic.
Offline Offline
Karma: 0
Posts: 1
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

I just bought an Arduino Mega 2560 r3 with a bunch of sensors, leds, resistors, etc... to mess around with. I also bought this hobby motor:    
Now I am realizing that I probably need a transistor to make it work.

A) Is there a way to test that motor without a transistor?
B) What are the steps you take to pick out a transistor? (using the above motor as an example would be great)
C) What are the main things you look at when looking at a datasheet? (here is the datasheet for the hobby motor I have (201-A):
D) Any suggestions for quickly getting into working with motors and servos? (learning about external power supplies, transistors, etc...)

Johannesburg. UTC+2
Offline Offline
Faraday Member
Karma: 113
Posts: 4932
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Here is a handy explanation of how to use a transistor.

It does say that the transistor it talks about, the BC547, is not what you want for the current drawn by a motor, but nevertheless it shows how to hook things up. It also indicates that the IRF520 is a good choice for running motors and such.

BUT..... they key thing to hooking up the motor is to use a diode as explained about half way down this page where it shows a transistor switching a relay... mentally change the relay to your motor.

Sorry I can't help with interpreting datasheets.... I'm sure someone here will help though!

Regarding testing the motor, well you can just jam the wires onto a 1.5V AA cell and it should run.

Servos are easy.... have a look here for that. But it's bad practice to give the servo its power from the Arduino- the red and black should come from their own source like a battery, and you need to connect the battery ground to Arduino ground.


The Elders of the Internet know who I am
I'm on LinkedIn:

Pages: [1]   Go Up
Jump to: