Arduino UNO R3 maximum current?

[xydix]

Hi.
I am about to add some stuff to my gateway.
It is an UNO with ethernet sheild powered through USB.

I will add:
Relay. measured around 80mA when relay is on.
lightsensor. ?mA. read somewhere around 0,5mA but let's say atleast 3mA to be sure?

Replace my cheap nrf radio against a 2.4G 22dBm 100mW NRF24L01P+PA+LNA from icstation.com

From icstation webpage:

Maximum power：20dBm（about 100mW）
Gbps：250k,1M,2M, Adjustable
Emission current：95mA
Sinks current：20mA

I am planning to connect these directly to my uno on 3.3V pin and 5V pin.

I don't know the consumption of the ethernetshield but i read somewhere around 150- 200mA

Will this work? Will i overload my UNO?

Any thoughts?

[sundberg84]

@xydix - Hello!
About the uno: https://www.arduino.cc/en/Main/ArduinoBoardUno

• DC Current per I/O Pin 20 mA
• DC Current for 3.3V Pin 50 mA
  I think its 200mA total for all pins.

You could use a transistor to drive the relay maybe?

[xydix]

Not so fancy but this is how I did. It will do for now.
This is the 5V pin under the USB connector.
Now I get 5V directly from my USB power supply.