Problem with robot made using arduino

[vijaykrishna]

i used four 12v dc 60rpm gear motor, for movement and arduino as microcontroller and controlled by hc-05, body of the robot weights around 4kg. Problem is, "when i power motor and press right in my Bluetooth app it dosn't turn right, when i removed weight it turned properly, HOW TO OVERCOME THIS PROBLEM? ( length between front and left motor is around 80cm) " (attached image too)

 

[(*steve*)]

Your question is not particularly clear.

Do you mean that when you put a load on your robot it would not turn right, but without the load it would?

If so, this might indicate that under load the motors generate sufficient noise on your per supply rails that the Arduino is affected.

A cure for this is typically to decouple the motor power supply from the Arduino's power supply.

If this sounds plausible then we can discuss what it involves.

 

[vijaykrishna]

Your question is not particularly clear.

Do you mean that when you put a load on your robot it would not turn right, but without the load it would?

If so, this might indicate that under load the motors generate sufficient noise on your per supply rails that the Arduino is affected.

A cure for this is typically to decouple the motor power supply from the Arduino's power supply.

If this sounds plausible then we can discuss what it involves.

yen when there is load, it dosn't and when there is no load, it does. i powered arduino by separate battery and motor driver by 12v battery. same robot which weights more than that turned right properly.

 

[vijaykrishna]

i used this video mecanisam for left right

 

[vijaykrishna]

i used this video mecanisam for left right

i made this kind of robot, it worked fine, and it was able to carry about 3-4kg. but it didnt worked for lengthy one as given image below,

Does problem occur from distance of front and back motors?

 

[vijaykrishna]

https://www.electronicspoint.com/threads/arduino-robot.257017/ will this front lifting mechanism work? because i tried by lifting on front side and it turned.

 

[(*steve*)]

I still don't understand what you're doing or what the problem is.

 

[vijaykrishna]

I still don't understand what you're doing or what the problem is.

Its simple, it dosn't rotate left and right

 

[(*steve*)]

Sure, but what is all this stuff about lifting.

Are those videos of your robot or someone else's?

 

[Alec_t]

Does problem occur from distance of front and back motors?

Yes. For a skid-steer vehicle, the greater its length the greater will be the frictional moment about the turning axis for any given load. Clearly your motors have insufficient power for overcoming the friction involved in skidding the vehicle round.

 

[vijaykrishna]

Sure, but what is all this stuff about lifting.

Are those videos of your robot or someone else's?

fixed

 

[vijaykrishna]

Yes. For a skid-steer vehicle, the greater its length the greater will be the frictional moment about the turning axis for any given load. Clearly your motors have insufficient power for overcoming the friction involved in skidding the vehicle round.

fixed

 

[vijaykrishna]

thanks, i fixed it by giving 2 motor driver for front and back motors