Insufficient output voltage from arduino mega2560 board.

[LabView_007]

Hello,

my arduino mega2560 not providing sufficient out voltage

I checked all digital pins and the problem is same.

The pin output is 4.2-4.5V,and  this output is not sufficient for my load.

So, kindly tell me why is the cause of this reason and how to rectify it.

(I don't wont to use external amplifier circuits)

Thank you.

[Nathan_B.]

The Arduino is not able to source any significant amount of current.  What are all the devices that you are trying to control with Arduino?

[CarlosOtiniano · Accepted solution]

arduino unfortunately has no programming devices or to increase output, you need to attach cards are on sale in stores at very affordable prices and sobfre suit all plac arduino and mounted on it are known as http://playground.arduino.cc/Main/SimilarBoards shields, can controlled from engines, to dedicated telemetry transmitters modules, this link is the engine card http://arduino.cc/en/Main/ArduinoMotorShield 

[LabView_007]

Hello Nathan.B,

I am simply connecting 5V consuming load as:-

Alarm buzzer ckt,

Small led lamp (5 LEDs on parallel),

brush-less DC motor (5V-Toy motor),

etc.

[Kristoff2]

A digital output pin can provide up to ~40 mA.  This not enough to drive a DC motor.  The arduino pins are logic outputs (low current) and not meant to drive loads (as previously mentioned).  If you try to drive a load (such as a motor) directly from the Arduino pins it will not be able to supply enough current and the Arduino will likely brown out.

If you want to drive everything mentioned above you will have to use an external supply.  For the LEDs you could use a mosfet or similar to use the Arduino to control the lights (on / off) while powering them from another source.  For the DC motor you should get a DC motor driver.

-Sam K

LIFA Developer