I'm sorry if this is on the wrong category, but...
I'm wondering if I should power my arduino with one power source or with two. I am using an arudino uno and I will need to power 4 motors and 1 servo. The total voltage will be 12V with 20A of current. I was wondering if I can just feed it all into the 2.1mm plug on the arduino uno, is that ok?
If I have to split it into 2 power sources, around how long can a household 9v battery last if I continuously use it.
feed your motors with the 12 power supply.
tie into that with a 5v power suppy
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are you motors stepper motors ? power for steppers is not simple nameplate amps when using a chopper driver
it would be far less.
how long can a household 9v battery last
Maybe an hour. Those little rectangular batteries are for smoke alarms.
Always power motors and servos separately from the Arduino, but be sure to connect the Arduino and motor power supply grounds together.
jremington:
but be sure to connect the Arduino and motor power supply grounds together.
That depends. If the motor drivers are completely optically isolated, one should not connect the grounds.
You can feed the 12v supply to the motors and to the Arduino's barrel jack.
What you should NOT do (even for a small motor) is pass the motor current THROUGH the Arduino board.
The small PP3 style 9v batteries are useless for Arduinos.
...R
From this message
kclark:
Ok, I finished working on the design, now I have a question about the batteries. I can't buy a buy an actual battery pack because it goes a little beyond my budget. So I was thinking of using a 8-AA battery holder (9V), but this time rechargeable, does that work?
I'm also wondering how this whole voltage thing works. I am planning to use 4 motors (1.5-4.5V) and a servo motor. Does the voltages add up (4x1.5V=6V), so I need at least 6 volts just to power the motors (excluding the servo)? And also, how much voltage does an average servo use, I couldn't find it on the specifications?
and this
kclark:
I'm sorry if this is on the wrong category, but...
I'm wondering if I should power my arduino with one power source or with two. I am using an arudino uno and I will need to power 4 motors and 1 servo. The total voltage will be 12V with 20A of current. I was wondering if I can just feed it all into the 2.1mm plug on the arduino uno, is that ok?
If I have to split it into 2 power sources, around how long can a household 9v battery last if I continuously use it.
I do not know how you get 20A total current?
Servos should work from 6V and typically draw as much as an amp.
No you don't add up the voltages for the motors,
You need 1.5V to 4.5V for the motors and another 1V to 2V voltage drop by the motor shield,
you need at least 6 volts just to power the motors
the Arduino board needs 7-12V to power it through the 5.5x2.1mm barrel jack.
which have a reverse polarity protection diode with rated current of 1A, hence you can not just feed it all into the 5.5x2.1mm plug on the arduino uno.
You have to split it into 2 power sources, one 8-AA rechargeable battery holder (8.4V) for the arduino uno through the 5.5x2.1mm barrel jack, another 5-AA rechargeable battery holder (6V) for the motors and servo.