Arduino UNO R3 maximum current?
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）
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?
- 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?
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.