Let's Make Robots!

dc motor

PWM and motors

Hey guys

I have built a robot using arduino UNO as controller and a L293D quad half H-bridge as motor driver. The motors are Pololu micro metal gear motor 100:1 HP hooked up to a 10,8V battery.

I am controlling the speed using arduinos pin 9 and 11 with PWM, but it seems difficult to get even a small amount for accuracy in speed, and the robot doesn't even move at duty cycles below 25%, and it is always quite noisy.

Reversing DC Motor

I have the 4WD Dagu 5 Rover with a Dagu 4 channel motor controller and I have got that working perfectly with an Arduino UNO and it runs very well.

I need to control 2 more DC motors however and so I went and got another motor controller and wired it the same using different outputs from my Arduino. I used very similar code for this DC motor as I did for the 4 wheels of the Rover.

Moves a vehicle forward, back, left, and right; teaches about gimbals
All my projects & progress are available at marginallyclever.com. about They were first researched in 1938. Curtis Boirum built one that got on Hackaday. Now … Read more

DC 20.6V DC 6616-006B

Hi all, 

I have some basic question about this DC motor. I found this motor have 5 Wire.

RED,BLACK,BLUE,YELLOW & ORANGE, image

The wire RED and BLACK wire are connected to motor coil directly and can be used just to simply run it.

BLUE, YELLOW & ORANGE are connected to an magnetic rotary Encoder.

Fastest Motor - Stepper vs DC

Hi all.I am building a drum machine for a university project and i need some help.

I am currently controlling a 9v stepper motor with 4 wires(Bipolar) with pic 16f877a, programming with micro c.

The speed i have reached it's not very fast between the bits (Forward and Backward movement and again)                                     so it's a little slow playing with the stick.

confused about how to drive a rc car using arduino

hi folks, I am trying to build an autonomous car by attaching my arduino uno r3  to my rc car. Please pardon me if there are certain stuff I don't understand as my electronics knowledge has long vaporised since my education days and im starting from zero again.

In particular, i'm using this guide http://www.instructables.com/id/Autonomous-Control-of-RC-Car-Using-Arduino/?ALLSTEPS as my RC car is also using a RX-2B chip.

2 DC motors = 1 Power source = Two different Voltage and speed ?

So hey guys,

My twin-motor gearbox does not work good anymore.

First it was perfect, both had same speed, but now one DC works slower with higher Voltage ??

 

Motor A runs faster than motor B while motor B uses more voltage

MOTOR A backwards: 2.22V

MOTOR A forwards: 2.30V

 

MOTOR B backwards: 2.36V

MOTOR B forwards: 2.48V 

 

What might be the problem?

 

 

Solarbotics GM2/8 DC Gearmotor

 

I have been hard at work creating some new CAD models to share with the LMR team. 

This is the Solarbotics GM2 (or GM8 depending on the gear ratio) DC Gearmotor.  It is modeled in SolidWorks 2008 as a single part file, not an assembly, to reduce the file size.

Battery suggestion.

i am using this 4 dc motor(100rpm) and 2 l293d motor drivers..if i want to run it for 15 minute.what is the best option for me?i dont want the robot to get too much heavy....

Motor sizing problem - Online calculators

Hi everyone,

I need two motors for my new robot and I used two online calculators to make the motor selection:

but I've got different results.

My input data:

  • mass 7Kg
  • 2 drive motors
  • wheel radius 0.037 m
  • velocity 0.38 m/s
  • acceleration 0.2 m/s^2
  • efficiency 65%
  • maximum incline angle 20 degree

Results:

Hello LMR, here's my first blog entry, and my first ever robot...

Hi there. I've been reading LMR for a while, and have just taken a few baby steps on the way to my first robot, so I thought I'd follow the rules and post a blog entry as a start.

I suppose this may be typical - I've spent a lot of time, probably too much time, pondering what I'm going to use. It's pretty clear that I've reached the "analysis paralysis" stage and can probably go on forever, so it's time to get a few things put together and take it from there.

My initial parts list:

DC motor with 3 wires?

Hi guys!

anyone knows what the third wire in a dc motor is for? I have two dc motors with 3 wires (blue, yellow and black), the first two are the common ones but don't know why there is a third one. I have unscrewed the cap of the motor and this wire is connected to the shield / armour of the motor.

Perhaps I should connect this wire to ground to minimize EMI... Any ideas? Thanks

My first robot..........

So I've decided to build my first robot which not the LMR "start here" one (that one is going to be my second one) and im using this circuit- http://costaricabeam.solarbotics.net/Circuits/Vores/555%20Photovore.png . I've tried about 10 different designs for the body but its just not working. When i cover the left photocell with my hand and the other one is exposed to light the speed of the motors is the same and same with the right photocell. has anyone tried the circuit? did it work?

Questions about my Arduino Motor Controller

hi guys I have bought an Arduino and the Arduino Motor Shield from adafruit. The tutorial on Ladyada says that I can power a motor which has a capacity up to 36V. So i programmed my arduino to run a motor on M2 and then when I check the voltage supply over there its just 3.17 V. So how do I power a 5V motor. Also the amperage on the pin is only 0.49A whereas Ladyada says that I can power a motor upto 0.6A and 1.2A peak.Is everything correct with my shield. I have also read that I can power it from an external supply-How do I do that? How will it help me?

Thanks in advance.

where to find a specific DC motor

I just found this two rc cars, and I want to give them a new life. The small one seems to be working ok, but the motor of the biggest one doesn't want to work.

4354576505_339d4cde32.jpg

I removed the dc motor and noticed one thing I never saw, there are the two wires that connect to the motor pins, and there was a third wire but got loose. I think it was soldered to the motor body, and I wonder where must it be connected.. ground? I try to ground it but the motor still doens't work.
Drives 2 DC brushed motors. Holds 4A per motor.
Need a 8A  motor driver but don't have a lot of cash, look no further this article describes a simple and cheap solution. This project uses just few electronic … Read more

DC motor question

I was walking through Lowes the other day, and found this great trash can that looked like a robot to me. I was able to pick it up for super cheap!! What I want to do is add two DC motors to the bottom and a caster wheel. I want to make this robot carry my books around school for me. I am lugging more text book weight than I ever did in the Army with my ruck sac. My physics book alone is killer.

Trash Can

PIC18F452 and DC motor controller.

Hey folks.

 Becausse the PICAXE kit already ships with all the components (er, most of it) glued, I wanted something more challenging. So, I am trying to build my robotic brains from scratch. 

Whilst I have come across quite a few (video) tutorials with circuit diagrams using PIC microcontrollers, I am not able to use a motor controller. One such is here: http://www.seattlerobotics.org/encoder/200001/simplemotor.htm. 

DC motors: "altered brush timings"

In this thread, under Chris' noise question, Cliff suggested that motors sometimes are optimized to run in one direction. To the detriment of the motor's performance when running in the opposite direction. Ken observed the same thing in car-window-wiper-motors. Now I want to know more about this.

Have a look at the motor I use for my Theo Jansen Leg experiments.

dcmotor-commshift500.jpg

Too good to be true? (DC motor)

I found on ebay these nice looking dc motors, lots of torque and very cheap. But are they really that good?

I've found this multifunction chip on ebay,  the official webpage is http://www.web4robot.com/ I've just bought a pair, I'll come back to post with my … Read more
an example of a driver for a brushless DC motor without microcontroller
This is a continuation of my blog on the same subject. Please continue your commenting here.     I am the proud owner of a stack of scavenged hard drives. I hoped … Read more

Walzing Hard Drive Motors

Update: This page is just an archive. The real work is continued as a walk through. Please direct all your comments to that page.



I am the proud owner of a stack of scavenged hard drives. I hoped to find really fast, torqueless motors inside. But instead I found myself a project for my new found 555 knowledge.

3phase_pulsegen_500mono_0.png

Hello, I'm proud to show you my first robot. Its name is "War Pig" and it's a line follower. I'll give you some technical specifications about the project. Let's … Read more