Let's Make Robots!

L298

H Bridge Trivia

Sorry guys-constipation and the iPad have me pondering the imponderables again. Can anyone explain to me why there are or why there need to be four f*€k!ng ground pins on these DIPS? They all run to the same point-it's not like ins 1-4 get a separate ground.

motor driver suggestions - 6v 6a stall

I am looking for suggestions on how best to drive my Pololulu motors on my MopBot.  This bot is basically a swiffer mop attached to the bot which it pushes around so it requires more torque than the usual small bot I have done before.  These motors are rated 450 ma @6v with no load and 6 A stall.  I am using 6 NiMH AA batteries in series for about 7.2V - 7.5V although could go higher if needed.

L297 and L298 problems

Hi LMRians!

I do not know how should i chose the amount of resistors needed for the currents sense pin of both L297 and L298! It seems that they control the amount of current flows through the winds of the connected stepper motor. right? but how much resistance they need? Surley, it is related to the stepper motor. how is it related mathematically?

L298 problem

I'm making a robot and I'm using an L298 to drive 2 DC hobby motors (specifically, the tamiya twin gearbox). For some reason, the L298 give out 3.4V on its outputs when applying logic low to the corresponding input. Does anyone know why this is? I am going by the example schematic in the datasheet, using 5V for logic power supply and 9V for motor power supply.

This is modullo, one of my first elaborated robotic platforms. It hasn't got an actual purpose yet, I'm at the stage of adding various sensors and integrating them … Read more
Navigate by commands from android device or computer
Using a
Update #2 10th June, 2011 Added another video showing the robot doing tight pirouettes on a small kitechen scale. Update 10th June, 2011 Added new pictures, which … Read more

CNC Machine V2 with RepRap Controller

I finally finished my Fireball V90 CNC build.  In May, I got the frame, and I planned to use the motors and electronics I purchased for upgrading the Valkyrie-clone CNC.  So I made some NEMA-17 to NEMA-23 adapter plates from CD-R disks, and got it all up and running.  It's running off 12V for now, with 24V planned in the future.

 

This is my second attempt at a robot, and my first more or less blind since I basically followed the start here tutorial for my first one. My goals here were … Read more

Stepper Driver V3 (draft)

Hi all,

I've been working on the driver for the next CNC, V3.

This one should be able to drive bigger motors up to about 2.5 Amps per coil, while providing current limiting.

It's features shold be the following:

- wave, full and halfstepping selectable in software

- I2C and step/dir/enable interface available on board

- home sensors connectors

Below is an iamge of the PCB I layed out:

vk3_driver.png

 

 

 

 

 

RepRap Stepper Driver v1.2 and Next Gen CNC

In the picture from top-left, clockwise to bottom-left: the terminal block (24V power up to 13A), the 2 X-axis drivers, the Y-axis driver (blue heat sink), and the Z-axis driver (blue heat sink), the Arduino controller (direction x3/enable x3/step x3), and just below the terminal block there is a small 9V regulator board to shift 24V down to 9V for the Arduino.  Everything is mounted on an MDF board, and the board is mounted with baling wire.

 

Old pic: http://letsmakerobots.com/files/clone_cnc_closeup_1500px.jpg TinHead's Original: http://letsmakerobots.com/node/9006 Vector Drawings: … Read more

HaBot photo

Habot v1.1

Function work now, trying to do funny thing.

1. tank can go forward, backward, turn right and left.

2. Detect the object distance

3. stepper motor can turn to absolute angle.

4. detect distance on every angle of stepper motor and find the shortest distance of every angle.

 

 

Timers and ... stuff

Hi all!

Been pretty busy lately digging in the big black timer.pngmystery box called Timer  on those nifty AVR controllers.

I think I finally have a clue how they work, and more then that, how they can be put to good uses. 

One application I'm going to do now that I have a clue, is to (try to) do microstepping. Yeah I blabbered about that other times too.

Help with connecting Arduino clone to L298 based motor driver

I am quite new to the world of robotics, but have years of experience with basic passive components (caps, resistors, etc) so I thought this would be a fun way to start learning more.

 To start myself off, I picked up a handful of arduino clones, mostly seeeduinos.   I built some motor shields and got those programmed, and working successfully with some cheap hobby motors, I've also successfully managed to get some servo's running without a problem as well.

Cuts shapes with better precision then me :D
Using a
Pictures:  - the front   - the back - left - right - the power unit Read more

The Valkyrie

Hi all!

So the Beast is dead, buried, gone .... I actually intended to keep it as it was but hey I needed the parts :)

The new machine (Valkyrie) is basically completed and since the keyword for this one is ADJUSTABLE I still have to adjust things :D

Will start soon a new robot page for it ... stay tuned.. 

My First BatchPCB, er batch

So I finally got my first home designed PCBs back from BatchPCB.  As a bonus, I got double the parts I ordered.

 IMG_2064.jpg

My L298 Motor shield:

 IMG_2065.jpg

My Q1114 sensor board (for line following/wheel encoders)  The mounting holes will need some rework.

 IMG_2066.jpg

For now it draws the shapes provided, eventually it should cut them too - actually does do cutting now :D
Using a
Hi all,  As OddBot suggested on my blog I have created a robot page for this thing. I will update this page with more pictures schematics, code and video as soon … Read more

Yet another L298 based motor controller

Hi all,

motor controller

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 This came out as a sub project related to my DIY CNC machine "the Beast"  because the outputs of the Arduino would not suffice to control the motors. So I chose to use I2C for this purpose and designed my own little guy.

l298 used for bipolar stepper control

Hi,

For the project I'm working on I have designed a motor control board based on the l298 and an Attiny2313, which can be controlled using i2c.

It works pretty good but I'm having a strange issue running a 12 volts stepper: 

When I'm making one single step at a time the torque of the motor is very low no matter  how long I keep the coils energized. If I do multiple steps the torque is as it should be for this motor. 

  Update: 13, April, 09 This time I added the Solarbotics L298 Compact Driver Kit, the car is now much more powerfull and it is very cool to drive.   Read more