Micro servos can be used as robot wheels and are more convenient for such applications. This is due to the fact that micro servos have a certain figure that helps you attach it to a robot chassis or what not. PLUS: It has that cute but not irritating sound that makes it really nice to be used on cute but reliable robots.
Micro servos usually have a maximum rotation of 180 degrees and a dc motor on the other hand has continuous rotation.
Before proceeding to this tutorial, make sure you have extra money because you might do this wrong if you're doing it for the first time. But nevertheless, since I am going to guide you to this process, I just wish you good luck and I hope you're money gets spent for a cause.
I am also not held responsible for whatever happens to your servo and it is really hard to put everything back the way it is once you've done this hack. (Yeah, I've tried it out and luckily I got the servo back to normal)
ALSO, TAKE A SNAPSHOT OF YOUR SERVO AFTER EVERY STEP. In this way, you can go back to step one any time.
Step 1: Materials
Shear cutter or Hobby drill
Stranded or solid wire
And of course, a micro servo
However, I understand that some people don't have a micro servo and might want to buy one.
Here are my store suggestions:
In North America,
- Sparkfun through shipping
In the Philippines,
- eGizmo, Taft for almost P200
Step 2: Open it!
Also, make sure you keep the removed screws because you will put it back later.
Step 3: Familiarize
See the photo for the parts you must take note of.
Make sure you DON'T remove the motor and remove only the PCB with the capacitor later on.
Step 4: Open it again
Now, I want you to take the gear I will indicate through the photo above. BE CAREFUL and don't remove the other gears. Just in case you removed them, put them back and use the photo as your reference.
Step 5: Cut the protection
WARNING: Melting plastic is harmful to one's health. Proceed with using the gun wearing at least a mask so you won't inhale the melted plastic.
Step 6: Put it all back
Yeah, but wait, you're not done.
Proceed to the next step!
Step 7: Time to cut some wireeesss
After that, solder your desired wires to the two pins/terminals of your the small motor. In my case, I use either a stranded wire or cut female connector depending on where I will connect it right after. For your convenience, use a red and black wire for the two leads so it won't be hard to determine which is reverse or forward.
But a small tip, apply tinning on your wires so it will stick easier. Place also a few tin on your motor leads. This will help you a lot with soldering.
Lastly, you might want to add holes on the cover of your servo. In this way, you can insert the wires on the holes because sometimes the wire is too thick it won't fit through the original opening of the servo case.
Step 8: Testing time
Why is my servo not moving at all and it makes a clicking sound?
- Your gears might not be placed correctly and firmly. Open it again and don't apply any voltage until you get it running continuously.
WTH? Why is this motor really noisy?
- Yeah, your motor will really have that crispy sound. Nevertheless, you will get surprised on how much torque it has.
I accidentally removed the potentiometer, what should i do?
- Put it back since your motor might not run properly without it even though it has no connection to the circuit at all. It acts like a bearing so please, put it back.
I can't put back my servo and you wasted my money!
- Sorry, I just told you I'm not reliable for what might happen to your servo. Peace man.
How many servos have you done this with already?
- I've done almost 10. I have 3 robots that uses them and it's very stable. It's not like other people say that servo gears get worn out after a certain period of time.
Step 9: Congratulations!
Thank you and please follow my other tutorials especially about Arduino, robotics, motors, etc.
If you have some queries and suggestions, just insert a comment below and please also visit my blog at:
Keep on tinkering!