Jury Rigging a Servo to Drive a Low Voltage Motor

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http://www.instructables.com/id/Jury-Rigging-A-Servo-To-Drive-A-Low-Voltage-Motor/

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Jury Rigging A Servo To Drive A Low Voltage Motor (DIY ESC)by Nicapizzaon March 26, 2013

Table of Contents

Jury Rigging A Servo To Drive A Low Voltage Motor (DIY ESC) ...........................................................................

Intro: Jury Rigging A Servo To Drive A Low Voltage Motor (DIY ESC) ...................................................................

Step 1: Parts And Tools ......................................................................................................

Step 2: Open The Servo .....................................................................................................

Step 3: Where We Are So Far .................................................................................................

Step 4: The Soldering .......................................................................................................

Step 5: Finishing ........................................................................................................... 1

Related Instructables ........................................................................................................ 1

Advertisements ............................................................................................................... 1

Comments ................................................................................................................ 1
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Author:Nicapizza

I absolutley love to make stuff! Everything from go karts to electronics and Arduino.... At age 14 possibly the youngst person to make a prusa mendel?

Intro: Jury Rigging A Servo To Drive A Low Voltage Motor (DIY ESC)Every good maker has used a servo at sometime or another. Whether it was for a RC car or an Arduino powered robot arm. I was working on building an Arduinopowered tank. I tried using continuous rotation servos as the drive motors, but it was much too slow. I knew how to interface a servo with an Arduino, so I really wantestick with this and didn't want to pay the money for a motor shield. Then I got creative....

I designed this device to allow me to control a motor with an RC receiver/transmitter setup, but the same system can be used with an Arduino! It has full motion contro

going both forward and backward, and speed can be controlled. For the RC minded, this is just a cheap, DIY Electronic Speed Controller, much like those in Rc airplaand Helis!

NOTE: When using with Arduino:Program this with the servo library as you would program a continuous rotation servo.This can be used with Arduino as long as a seperate battery is wired, it may draw too much power from the Arduino if ran directly off the Arduino's 5 volt p

Image Notes1. The Final Product2. Tamiya Gearbox with Motor

Step 1:Parts And ToolsFor this project you will need:Materials:

Servo (I used a Parallax servo avaliable from Radio Shack

Dc motor (mine is in a gearbox)

Hookup wire

Tools:

Soldering iron and solderDesoldering pump or braidNeedle nose pliersSmall screwdriver
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Step 2:Open The ServoUse the screwdriver to remove the 4 long screws on the back of the casing.Remove the top with the servo arms. Then, take the gears and fittings out. Next, unscrew the servo arms so you are left with the top part of the casing that has a hole where the servo axle came out. When the screws came out, the bottom of the casing should have fallen off along with it. If not, just pop it off. You should be able to sethe pcb that controls the motor. Use the small screwdriver to unscrew the motor from the top of the servo there should be two small screws. Then use the screwdriver pry out the pcb and the motor, which is directly mounted to it. BE EXTREMELY CAREFUL NOT TO SNAP THE CIRCUIT BOARD! I did, then tried to solder it back. Imade magic blue smoke! :(


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Image Notes1. Screw2. Screw...3. Well, This is getting old...4. Guess what this is!

Image Notes1. Dont Loose These!


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Image Notes1. End of potentiometer, remember this...


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Image Notes


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1. Pcb to remove

Step 3:Where We Are So FarWe ahould have the motor control board and the case. Locate the potentiometer. We need to put this in the exact center position to trick the controller board. This willallow us to use the motor as though it was a continuous rotation servo. Be careful not to move this piece, as you will have to readjust it again.

Image Notes

1. Once removed


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Image Notes1. Sorry about relitively bad quality. Adjust this Pot to as close as possible to theexact center

Step 4:The SolderingLocate the two leads that power the motor. Carefully desolder it and remove the motor. Use the pliers to help you. Two pieces of of hookup wire need to be cut, aboutfour inches each. Solder one to each of the leads from the motor. Thread these through the small screw holes used to hold the motor in before we removed it. Then, pthem through the hole in the top of the case.


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Image Notes1. Desolder this...2. ...and this.


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Image Notes1. Thread through screw holes.


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Image Notes1. DONE!

Step 5:FinishingAlmost Done! Screw the case back together. Hook up the two loose wires to the lead of any other low voltage motor. Hook it up to an Arduino, RC reciever or anythingelse that can control a servo, and let 'er rip! The last image is it hooked up to my Tamiya gearbox and motor, and it works great! Good luck, and please tell me aboutanything you make with it!

Also, I'm entering this in the Macgyver contest, so if you like this project, a vote would be much appreciated!


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Comments

2 comments Add Comment

Nicapizzasays: Apr 1, 2013. 3:29 PM REPFirst of all, Thank You!This setup does allow the motor that you add run forward and backward!When I made this, I was using it for the drive motor of a small RC tank, so I did need forward/backward. I was using it with an RC transmitter/receiver, and learned to my suprise that you can also control the speed! I did not mention that, so here comes an edit!

DIY-Guysays: Apr 1, 2013. 2:41 PM REPLooks interesting.Forgive me if you covered this, but can the motor be run forward andbackwards?(After 'ibles changed their format awhile back, the images drop down over the text areas now with my older browser.)
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Jury Rigging a Servo to Drive a Low Voltage Motor