Let's Make Robots!

L293D

cr2cX - The long story

cr2cX was born as a robotic platform to test and experiment various concepts of the robotics field.

Because I have designed and build a robot 16 years ago I considered that it will be useful to start again and teach my kid some things. I have taken the hard way by designing and building every module and piece of software. To be able to speed the building and experiments a little, I've taken some shortcuts:

Navigate and avoids obstacles
Using a
A robotic platform far various experiments related to this field and to teach my kid some things about robotics. It's 16 years since I have build my first robot and … Read more

New controller board

Hello, it's been a really long time, since I last posted something on LMR, but now I've made a new controller for my robot and I thought I'd blog about it.

The controller features

H-Bridge Motor Driver 1A

the store that im buying all my gear for the start here robot doesnt stock the l293d motor driver

they do, however have the H-Bridge Motor Driver 1A which, in the description, is said to be a replacement for the L293D

is that true??? should i buy it or just go to another store to pick it up?

thanks muchly...

08M motordriver and power supply board

 

After a few weeks of waiting, my PCBs have arrived. I just soldered the components on the first one and it works like a charm. I had to drill out the holes for the resistors a bit and then solder the resistors on both sides of the board to get a good connection, but hey: this was also my first shot at having a PCB made and it works. Next time I'll be more careful checking out the dimensions in diptrace.

Hi LMR! Well the time has come, this is my first ... OK not first but first posted bot :D This little dude has been built and rebuilt for 3 times now, it's purpose … Read more

The Making of CircumPic

What follows represents my aim at documenting the creation of my yet to be named robot using a picaxe18x for brain and a l293d for motor control. Hopefully at the end i should be able to control the robot via IR and also have the ability to flip into auto mode. Too much to expect from an 18X ? We'll see.

July 11, 2011

Why does my motors stop spinning after awhile

 

Hi all,

I am on my second (well third if you count my incomplete herbie bot) and i have completed proto work on my project board with hook up wires. My basic code thru the PICAXE 18X is to keep pin 7 and 6 HIGH while 5 and 4 LOW as triggers to the inputs of a L293D motor driver. What I find is that for the most part the motors spin for a while and then stop for no reason.

 

My L293D are directly connected to the motors with no caps in place. Could the missing CAPS be the reason my my motors halt after awhile ?  

 

 

If you are running out of input/output pins of your Picaxe here's something that might help you: Picaxe's configurable input/output pins can be used in three … Read more
Roams around trying to avoid objects via ultrasound
Using a
This is AR-DEE, my first approach to  robotics and electronics in generall. It uses a Arduino and a Parallax Ping)) to avoid … Read more

Motor Controller Board

Well I've almost had 3 weeks offline and got a ton of thinking done.  The physical design is basically the same, going to use a PicAxe 14M to control four DC motors with two L293Ds. The picaxe will be optically isolated from the arduino, so if the motors, an IC or a wire shorts out and decides it doesn't want to go alone that it doesn't have the arduino as an option as a buddy in IC heaven or hell.

This is Ardubot, another Arduino based robot. Its base is the Sparkfun Ardubot. The brain is a Seeeduino V328 Arduino Duemilanove compatible board. Powered by a … Read more

Arduino Motor Control Code Help

I am currently using a arduino duemilanove, and it is awesome. I have been playing around with it for a couple of days now, and I really like it. Anyways I figured it was time to start to building a robot. I decided to start with the motors. For the motor control I decided to use guibot's tutorial. It worked fine, but the motors only traveled in one direction. Because I wanted the motors to also travel in reverse too I decided to experiment with my own code (on only one motor) that looks something like this:

Inconsistency in my L293D

Sorry, I have no schematic prepared to make this easier.

L293D by ST Electronics (datasheet) (quad half-H-bridge), only one power source: 5V from battery.
V1 = V2
Enable pins for 1+2 and for 3+4 are high.
Input pins for all half-bridges are pulled to GND via 22kOhm resistors
Motors connected to outputs: M1 to outputs 1+2, M2 to outputs 3+4.

All on the breadboard, I have an extra wire in the V+ bus. I use it to make the inputs high. Start experimenting.

Custom project board in progress...

Hi, I have a spare PICAXE 28x1 and L293D that I want to use for my first custom built circuit. But i have no clue what to do!!! The diagrams on the Picaxe website are so confusing and the ones in the manuals only show the pinouts. Can I just hook up 4.5 volts? Or do I need fancy shmancy support circuitry like capacitors and stuff? 

Thanks guys! 

UPDATE:

I have a diagram of the L293D and it is nice to have, but very confusing.

Picture_2.png

Since I started messing with robotics that I wanted to build a tank, and finally that moment arrived when two Tamiya thread kits and a Twin Motor Gearbox arrived. … Read more
Futurlec has a good range of components, their prices are reasonable, they have no minimum order charge and they deliver around the world.  Postage is a bit slow … Read more

problems with L293D + Arduino

I wired up a L293D to my arduino, planning to run 2 motors with it, and just for testing I runned the blinkie program on it changing the LEDpin to the to the digital pin that goes to the l293d but only half of the pin works, like it turns in only one direction. Is it normal ?

 

It's 4 in the morning so I did not do a lot of trouble shooting, just changed the pins that were on PWM to digital, it didn't changed anything.

*********************************************************************************************** update 26/4/09 … Read more
There are various different chips which are commonly used with the Picaxe chip. Here I attempt to explain what each one does, where it goes and why you might care. … Read more
This chip enables you to take 4 outputs and turn them into 2 that can be reversed. Note that the chip can get quite warm, but it is designed for … Read more