Supply power to servomotors, connected to Arduio Mega 2560

Other Hardware Motors, Mechanics, Power and CNC
1

I am using servomotors torque: 40 kg/cm; power: 4,8 - 7 V.
I connected 12 servomotors to Mega Sensor Shield v1.0, which is generaly connected to Arduino Mega 2560.
So I need the power: 6 V.
Therefore I will connect the power to Arduino Mega!! Not to Mega Sensor Shield, because it worf with 5 V.
But at first, I have problem with current. What current should I use?
I found out that servomotors with torque: 20 kg/cm, work with current: 4mA/idle not operating 400mA.
Therefore, I need 300mA * 2 = 600mA.
600 mA * 12 = 7200 mA
Is it right?????
And if it is right. Therefore I need the power: 6 v and 7.2 A.
My second question! Adruino Mega will not burn, if I connect to it 7.2 A????

Looking forward for your reply!
Thank you!!

2

My second question! Adruino Mega will not burn, if I connect to it 7.2 A???

Does your mobile phone charger burn out when you connect it to the mega-amp power grid?

3

Use an external 8A regulator to power the shield. Driving such heavy motors and arduino on same supply isn't a good idea anyway.

REMEMBER : don't power the motors through the VIN of arduino, it will surely damage your arduino, as there is a 1A diode on it, plus i don't think so the VIN track will be able to take anything more that 3A.

4

Hi,
You need to SEPARATE the voltage going to the Servos through the 3-pin connectors on the "Sensor Shield" from the power supply for the MEGA.

6V is OK for the Servos. Make SURE you remove the jumper on the Sensor Shield and supply separate 6V power to the terminal block.

Power the Mega from USB or from a 7 to 12 volt source connected to the Mega External Power jack.

-----( info on the Sensor Shield )------
"Sensor Shield" for Arduino MEGA V2

This shield board plugs on top of an Arduino MEGA (1280 or 2560) and makes it easy to connect to all the MANY Digital Inputs and Outputs and the Analog Inputs. This is particularly good for high I/O projects with many LEDs or controls where connections to the Mega can be a major problem.

Click on the photo above to see details. You can see how the connections are arranged. Every connection has a set of 3 pins: Gnd-Voltage-Signal that makes it easy to connect with our 3-pin cables or jumpers. See: http://arduino-info.wikispaces.com/Cables (See Photos Tab for detailed connections)

This version has two options of +5V supply to all the "V" pins:

Jumper on: +5 comes from the Arduino. Should be limited to about 300 ma
Jumper off: +5 comes from the blue terminal strip and an external supply.
Using an external supply allows power for control of many servos or relays, and other attached devices.

There is also a power-good LED, and Reset button, and connections for other I/O devices
-----------------( END COPY )----------------------

See the Mega Sensor Shield HERE:

There is also a special Arduino UNO/Duemilanove Sensor Shield with the separated power for Servos HERE:

DISCLAIMER: Mentioned stuff from my own shop...

5

Basic external power setup for servos

6

Just a little clarification:

AI_Robotics:
I am using servomotors torque: 40 kg/cm; power: 4,8 - 7 V.

Torque is force x distance, the unit is kgf-cm (kilogram force times centimetres).

The better unit is N-m (newton-metres). 1 N-m = 10.2 kgf-cm

Torque is actually really energy per unit angle, but is commonly thought of as
force times distance-from-axis.

Force is energy per unit linear distance which has a nice symmetry
with torque as energy per unit angle.

Force in newton == joule / metre
Torque == joule / rad == newton * metre / radian (sloppily == newton * metre)