Let's Make Robots!

L293D

UPDATED and FINISHED* on May 3rd, 2014 *With 'finished' meaning that I built what I had envisioned, then played around with it and learned stuff, and then took it … Read more

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.
My first attempt at building an autonomous robot on a tight budget. Having seen the prices of robot chassis with motors and gearboxes, and knowing that I needed … Read more
PROJECT CONTINUED! So I found a motor from a toy. Works fine. The same speed as the other. But I still have the problem with the whole robot turning. I'll post a … Read more

Motor just buzzes, no movement

I'm trying to follow this tutorial:

http://myrobotlab.net/tutorial-control-a-dc-motor-with-raspberry-pi/


Now, while I'm not too familiar with Breadboards, since I dont have one, and can't afford one right now, I've had to take it into my own hands to carefully solder wires between the points. I seem to have everything done, but when I start the program, the motor DOES start a buzzing sound (don't hear it when the program is NOT running) which indicates I'm at least partway right.

 

So my questions are,

Issue with L293D

For some reason I can't get my H-bridge to turn my motor both direction. It was working a week ago when I was working on it. When I turn Input 1 High and Input 2 low it will turn the motor forward but when I turn Input 1 Low and Input 2 High and doesn't do anything. Well actually I can feel like a buzzing sound like its trying to work. I am powering the H-Bridge with it own power supply on pin 8 (Vs). Maybe something I'm missing.  I will tried adding some capacitor in to see if that help any.

L293D Motor Driver PWM Problems

I recently put together a L293D motor driver circuit (from Bajdi's very helpful website: http://www.bajdi.com/obstacle-avoiding-robot-made-from-cheap-parts/l293d-schematic/).

When I use PWM from a Teensy 2.0 (analogWrite) on the enable pins, the motors only make a soft high-pitched whining sound and don't move at all (but max duty cycle works of course). Using digitalWrite, the motors rotate fine. I would like to have speed control but am stumped about why the motors don't rotate. I've seen others use PWM on the enable pins fine so it might be my motors.

Saying HI again. Still here building bots...

Hello again!

It has been ages since I have been on LMR and I missed you guys something fierce! :-)

I have just built another "generic" Arduino based bot (it WAS NOT fun getting the driver to install in Windows 8!!!)

(I will try and get a picture and more details up when I can, but basically it uses a Arduino Uno, a servo/Sharp rangefinder combo and a L293D bridge chip to control 2 very low power motors driving the wheels in differential form. Like I said, pretty generic.)

Will run around autonomously and remote controlled, interacts with other robots (maybe)
Using a
     Hello all you guys. It's been some time I'm thinking about of build a kind of interactive robot (something like a butler, service robot). Recently I saw … Read more
Navigate around via ultrasound, plays tones, IR remote controled or autonomous
Using a
This was my first robot.In the very beginning it was supposed to be a simple picaxe shield of my own.   I then thought I could add a "body" to it and discovered … Read more

L293D 5V in - 3V out

Hi, I have a problem with L293D. On Vcc2 is 5V, but on JP1, JP2 is only 3V.

L293D 5V in - 3V out

Hi, I have a problem with L293D. On Vcc2 is 5V, but on JP1, JP2 is only 3V.

Using 4 Motors?

Hi all, I've made my first robot using a picaxe 28x1 project board. This uses the L293D to drive my 2 motors (connected to a & b). My question is, if I wanted to power 4 motors from a robot, what would I need to do? Is this hardware capable, or should I be looking at something slightly different?

Also, I have a AXE230 PICAXE-08M Module...which says it can be attached to the board and enable the use of additional servos or other output devices, but does not specify motors.

It Follows Black line on a bright background
Using a
This was my second Line following robot. After lots of runs I made some changes to the position of the IR sensors. I used the IR TX pair combination for the line … Read more
Program and control motors, servos, sensors
UPDATE Oct 8, 2012: I have made a small PCB adapter to complement the GOduino III to enable 90 degree positioning of directional sensors such as ultrasonic and IR … Read more
This is my picaxe 20m2 dev board. It has picaxe itself, a LM7805 voltage regulator and two DIL sockets, one for ULN2803 and the other for L293d (already in place). … Read more

Driving One Stepper Motor With L293D Using Two Pins

Question: Is it correct, that when I solder the following circuit there are only two pins nessessary
from the microcontroller to the L293D to drive a unipolar stepper motor ?

Answer: Yes. That is correct.


Question: Are the two NPN transistors and the 10kOhm pull-up resistors responsible for the signal inversion?

Answer: Yes. That is correct.


 

How do you use a L293D Motor Controller with an Arduino MEGA?

I have recently received my order from ebay. A L293D Motor Controller for my first robot. I read the datasheet and other guides but i can't figure out how to use it, please help! I didnt order 2 so i only have 1, if it fries, i cant get another one or i have to make one. :(

 

It tracks its opponent and tries to push it out of the ring, while also trying to stay inside the ring itself
While planning the Boise Bot Comp this year, we decided as a new event to try our hands at the micro level sumo and see what we could make. Initial thoughts were … Read more
Races around the room using ultrasound
Using a
I was inspired to make fritsl's wall racers when he showed them off in episode 18 of The latest in Hobby robotics on Makezine's youtube channel.  After finding his … Read more

why is my chip burning?

i want to control 4 motors with a single L293d.but the chip is becoming extremely hot.is it burning bcoz of the 2 extra sorte motor or i might have any short circuit in my bread-board?(i had triple checked it).

l293d

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....

Controlling motor speed with 293 without a POT

This is my first step to robotics. In this project all i did was use an arduino with L293D to control the motor speed without a potentiometer. this was actually an assignment / a small test given to me by CtC (chris the carpenter). the motor is suppose to speed up and down with a delay. 

"stop - ramp up - hold - ramp down - stop"

Test bed & experimental platform for re-discovering the joys of robotics
Using a
Well, this is my first robot in approximately 15 years and damn but things have changed! Put it this way, the last book on robotics I read was 'The Robot Builder's … Read more

Review: Guibot's Motoruino

Intro

The Motoruino is an Arduino based robot brain, which includes everything needed for a small robot onboard.

L293D Motor Driver

Hey, can anyone tell me if the L293D motor driver chip can take an analog value to its input pins?

Or does it have to be a logical 1 or 0?

Just wondering if I can drive my motor at variable speeds with it, or if I only get one speed or no speed.

Here is a diagram of the chip: