Robot arm control electronics

[D.C.]

if i go with the servos is there any board that is simply to connect and can store the positions?
my ideaa is to have a box with a joystick or two to control the movement of the motors, and a pot to control the speed of motors.
thansk

i´m just concerned because i think servos are not very robust.
thats why i´ve choose the dc motors the thing is that these motors cant find a position, and cannot be controled with a potenciometer for direccion.

I'll say it again as you seem to have missed it, a servo IS A DC MOTOR (usually)(with a gearbox, encoder and electronics). You seem to have a mental block processing that fact. There are many thousands of different types of servo to suit all uses and budgets, if you are looking at for example a 9g mini servo made of plastic with cheap plastic gears you would be correct to say it is probably too weak for you. But if you are looking at a high end robotics dynamixel servo made from titanium it is rather a lot of overkill.

Until you can say what forces you want your robot arm to deal with you can't really pick the right motors, until you have chosen the motors and figured out what their power requirements are you can't choose a control board/driver/chip because a 3 amp draw on 300mA chip will not work just like it's daft to buy a 70V - 15A board for a servo that wants 1A at 12V.

If you want something that just works out of the box with all the work done for you, you need to buy a robot arm kit.

Lynxmotion - AL5D Robotic Arm Combo Kit (BotBoarduino)

Don't forget you also need a way to save positions, delete positions, name positions, select positions, a way to instruct the robot arm to move to the correct position etc etc. You will need a lot more than just two joysticks to get the functionality that you desire.