L293D

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.

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. :(

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).

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:

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...

Hi guys, I'm working to build a linefollower robot to compete in both linefollowing and maze solving contests, but I've a few questions and problems I hope you could help me resolve.

MOTORS:

Well, the first problem are the motors. At the beginning I was using two 3v - 6v motors and this worked fine, but I had to duplicate the H-Bridge chip on my Picaxe 28X1 Started Pack due to the high amperage they required.

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 ?  

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:

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.

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.