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[on:]

Hi there

I was useing some small moters with a Robots Bits shield but the power was to little for the application.

So i have upgraded to 2 x 12V Motors that have a stall amperage of 5A, hence the Saber-tooth dual 5A Controller seemed perfect.
You can see what i have here: http://robotbits.co.uk/motor-drivers/sabertooth-2x-5amp-motor-driver/prod_58.html

I have an issue though, I have read (after paying for it and having it arrive) that i cannot simple use the Outputs on the Arduino to control it as it requires a Voltage input from 0-5V, and the Arduino that i have only does PWM and does not output the Analog voltage i require.

Can anyone help me with how to get my Arduino to talk to the Saber-tooth so i will be able to move my nice new motors.

If its a hassle and not worth it, is there any other Driver's that will power my 2 motors (2 x 5A) using PWM Input?

Many thanks
james

[Reply #1 on:]

You can use the R/C input option, and drive it using the servo library.

[Reply #2 on:]

you could use the serial input on the sabertooth as well

[Reply #3 on:]

You can use the R/C input option, and drive it using the servo library.

Hi
Ah i see, that seems very interesting.

What do most people use to write and upload there code to Arduino's?

I'm using the Arduino Software that is downloadable from Arduino's site.

To add the Library what exactly do i need to do?

many thanks
james

[Reply #4 on:]

You can use the R/C input option, and drive it using the servo library.

Hi
Ah i see, that seems very interesting.

What do most people use to write and upload there code to Arduino's?

I'm using the Arduino Software that is downloadable from Arduino's site.

To add the Library what exactly do i need to do?

many thanks
james

In the IDE File/Examples/Servo menu there are two simple example sketches you can play with to see how one uses the servo library.

Lefty

[Reply #5 on:]

Hiya

So i managed to get the robot built, and the servo functions working.

Unfortunately i cannot seem to find a way to code it to do the following:

Drive at a speed of 120 for 2 seconds
Stop
Wait for 2 seconds
Reverse at a speed of 60 for 1 second

I can get it to go forward and back but i cannot get it to drive for a set period of time.

is this an issue with using PWM? I did try using serial packets but it failed

anyone got any idea?

Here is my code

Code:

#include <Servo.h>


Servo motorR;
Servo motorL;
int speedo;


void setup()
{

  motorR.attach(9);
  motorL.attach(10);
}

void drive(int speedo)
{
  motorR.write(speedo);
  motorL.write(speedo);
  return;
}
void left()
{
  motorR.write(120);
  motorL.write(60);
}
void right()
{
  motorR.write(60);
  motorL.write(120);
}

void STOP()
{
  motorR.write(90);
  motorL.write(90);
  return;
}

void loop()
{
drive(1200);
delay(2000);
drive(1800);
//right();
//drive(105);
//left();

}

[Reply #6 on:]

well basicly if you can afford to use delay then

 

Code:

drive(1200);
delay(2000);
STOP();
delay(2000);
drive(1800);
delay(1000);
STOP();
delay(2000);

[Reply #7 on:]

Hi
Thanks for the Reply.

I don't think i can use Delay as my aim is to make this a reactive program using a switch statement.

I tried with a delay to just test and it ignored the delay and just spazzed out haha.

The problem i have now is entirely separate than this thread was started with so i will make a new post in a separate part of the forum.

thanks