Hi,
I was wondering if there is similar arduino products that can hold more maximum current than uno, and also has similar coding style.
Thanks.
What do u mean by “ hold more current”?
hammy:
What do u mean by “ hold more current”?
I'm using a lot of pins, and I 'm afraid that too much current may burn the arduino.
Hi,
Welcome to the forum.
Please read the first post in any forum entitled how to use this forum.
http://forum.arduino.cc/index.php/topic,148850.0.html then look down to item #7 about how to post your code.
It will be formatted in a scrolling window that makes it easier to read.
Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png?
We need more information about what and how you are driving with the UNO?
Thanks.. Tom... 
Microcontroller output-pins are not designed to "power" anything. They are "signals".
You can power an LED, but that's about it and the ATmega chip has a total maximum current rating (200mA I believe) so there's a limit to the number of LEDs you can drive simultaneously at "full brightness".
But of course, you can use MOSFETs or relays etc., to control an "unlimited" amount of power.
The ATmega microcontrollers have a generous 40mA absolute max rating - you won't find better
in a microcontroller, you add external driving hardware if you need lots of current.
Many microcontrollers (such as the Due) have much lower pin current capability, a few mA.
MarkT:
The ATmega microcontrollers have a generous 40mA absolute max rating - you won't find better
in a microcontroller, you add external driving hardware if you need lots of current.Many microcontrollers (such as the Due) have much lower pin current capability, a few mA.
Per pin, go over 20mA for prolonged periods at your own risk. I think the Uno can supply half an amp in total.
Thanks for all the replies.
I have found a simple solution: just use one more arduino uno, so the two arduino uno can split the pins and split the current.
Because I'm using Matlab to do real time control of many arduino uno pins via COM interface(digital input/output, analog input/output all used), so I just need to add another arduino Uno COM object in the variable space of matlab.
TomGeorge:
Hi,
Welcome to the forum.Please read the first post in any forum entitled how to use this forum.
http://forum.arduino.cc/index.php/topic,148850.0.html then look down to item #7 about how to post your code.
It will be formatted in a scrolling window that makes it easier to read.Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png?
We need more information about what and how you are driving with the UNO?
Thanks.. Tom...
I have draw a picture to show my usage of arduino to control whatever I can automate for a light sheet microscope. I have no circuit or CAD.
rmd06:
I have found a simple solution: just use one more Arduino UNO, so the two Arduino UNO can split the pins and split the current.
That sounds like a suitably bad approach! 
rmd06:
Thanks for all the replies.
I have found a simple solution: just use one more arduino uno, so the two arduino uno can split the pins and split the current.
Because I'm using Matlab to do real time control of many arduino uno pins via COM interface(digital input/output, analog input/output all used), so I just need to add another arduino Uno COM object in the variable space of matlab.
Very bad idea, can you
- LIST the devices you are controlling
- How much current is required on the control wires.
- Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png?
- Can you tell us your electronics, programming, Arduino, hardware experience?
You need to draw a proper circuit diagram.
Your UNO is only communicating with four devices, communications line do not generally require much current.
Are you using the output pins to POWER those devices as well?
Tom...