In my project I'll connect to my arduino 5V output a Servo LCD and a 5V DC Motor (fan) will it be to much for my arduino to supply (power wise).
Also I have a 4Ω spekar connected to one of the PWM pins.
Is it OK or should I get an 9V external battery with 5V regulator(7805)?
You should not power even a single motor or servo from the Arduino 5v pin.
If you need a simple external power supply for a servo a pack of 4 AA NiMh batteries would be a good option.
I presume you have circuit of some sort (maybe just a transistor) between the Arduino and the fan.
The PP3 type of 9v battery is useless as it cannot provide enough current. And a 7805 is a very wasteful voltage regulator.
I am not familiar with using speakers but I would worry that any of them (4, 8 or 16ohms) would draw too much current from an Arduino pin. The absolute max you should draw is 40 mA and at 5v that would require a 125 ohm resistance. 20 mA and 250 ohms would be a lot more sensible.
...R
Robin2:
You should not power even a single motor or servo from the Arduino 5v pin.If you need a simple external power supply for a servo a pack of 4 AA NiMh batteries would be a good option.
I presume you have circuit of some sort (maybe just a transistor) between the Arduino and the fan.
The PP3 type of 9v battery is useless as it cannot provide enough current. And a 7805 is a very wasteful voltage regulator.
I am not familiar with using speakers but I would worry that any of them (4, 8 or 16ohms) would draw too much current from an Arduino pin. The absolute max you should draw is 40 mA and at 5v that would require a 125 ohm resistance. 20 mA and 250 ohms would be a lot more sensible.
...R
I do have a transistor and a diode in the fan circuit.
You think a 4 pack of 1.5V AA battries will do the work?
I only need it to work once and not continously so reachargable batteries is not neccessery.
But will 6v AA battery will do the work for a DC 5V Motor, Servo and a LCD?
To my knowladge it's fine to connected a small speaker (such as 4Ω-3A) to the arduino with 1K resistor in line with it.
But I'll ask my teacher about it too.
(It's high scool priject for senoir year).
T-rex166:
connected a small speaker (such as 4Ω-3A) to the arduino with 1K resistor in line with it.
You did not mention the 1k resistor earlier. That will provide protection.
As to the batteries, try it and see what happens.
I assume the Arduino will be powered from the USB connection to your PC and there should be no problem powering the LCD from the Arduino.
...R
Robin2:
You did not mention the 1k resistor earlier. That will provide protection.As to the batteries, try it and see what happens.
I assume the Arduino will be powered from the USB connection to your PC and there should be no problem powering the LCD from the Arduino....R
OK thank you for your help.