Wiring a motor to the RPi?

One option is to use the gertboard and drop in an atmega 328.

With this setup  the PI will be the brain part and the arduino  the muscle portion of the setup.

the Gertboard has already 2 motor interface on it.

And the arduino has 6 PWM build in.

It will then be easy for the PI to just send the PWM values to the arduino via the serial port or I2C as you wish.

Ok,

I have bought a freetronics 'Eleven' which is exactly the same as the Uno. Here is what I want to do:

1. Two motors + one servo:

The two motors will be moving the robot and will be changing speed according to the position of a Joystick. The servo will either be the steering or for the camera (depending on whether or not it is possible to turn with the two motors and PWM). Both will be connected

2. The Joystick:

It will be connected to a PC running Linux (which I still have to setup) and controlling the direction and speed of the robot on the x-axis (forward/backward) and y-axis(left/right).

3. Camera

I have not got the camera working correctly yet (speed issues) but I will get this to work. I think that it is a combination of incorrect settings and network lag (I will see to this).

4. The Eleven

All the motors will be connected to this including the servo. The Two motors will be connect to PWM channel via the double H-bridge chip. I have a schematic to do this.

5. Software

I have no clue on how the software will work except that I need 3 pieces: Ardunio, raspberry Pi and PC. All I know is that I want dynamic speed control with the joystick. The formula that I came up with was:

(100/255)*i

where 'i' = position of co-ordinate of Joystick on the y-axis.

This will give out a percentage number which I want to replicate the percentage that motors are "ON" through PWM. I don't know if this can be done but I would like advice on how to go about it.

Ok,

I have bought a freetronics 'Eleven' which is exactly the same as the Uno. Here is what I want to do:

1. Two motors + one servo:

The two motors will be moving the robot and will be changing speed according to the position of a Joystick. The servo will either be the steering or for the camera (depending on whether or not it is possible to turn with the two motors and PWM). Both will be connected

2. The Joystick:

It will be connected to a PC running Linux (which I still have to setup) and controlling the direction and speed of the robot on the x-axis (forward/backward) and y-axis(left/right).

3. Camera

I have not got the camera working correctly yet (speed issues) but I will get this to work. I think that it is a combination of incorrect settings and network lag (I will see to this).

4. The Eleven

All the motors will be connected to this including the servo. The Two motors will be connect to PWM channel via the double H-bridge chip. I have a schematic to do this.

5. Software

I have no clue on how the software will work except that I need 3 pieces: Ardunio, raspberry Pi and PC. All I know is that I want dynamic speed control with the joystick. The formula that I came up with was:

(100/255)*i

where 'i' = position of co-ordinate of Joystick on the y-axis.

This will give out a percentage number which I want to replicate the percentage that motors are "ON" through PWM. I don't know if this can be done but I would like advice on how to go about it.

Hey Cdog, we have changed this to using a Windows Client and interfacing the joystick through Pygame. The joystick movement will then result in a changing modulation.

I have started a new thread here:

http://www.element14.com/community/thread/20181

and here:

http://www.raspberrypi.org/phpBB3/viewtopic.php?f=37&t=19725

If anyone can help me with the issues in these threads I will be happy.