Hi, I have an OrangePi_4b (RK3399), mounted in aluminum case, in which I am going to install armbian. I also have a mini-double fan that I want to attach to the outside of the box, to cool it. The approximate power consumption of this mini fan is 300 mA.

According to the orange pi 4b manual, I find these Gpio:

 

PIN1 VCC3V3_SYS
PIN2 VCC5V0_SYS
PIN4 VCC5V0_SYS

 

The questions (to whoever can answer or has experiences) are:

 

For those pins respectively, what is the maximum consumption per pin, measured in milliamps?

Is it feasible to connect the mini-fan to Gpio (V + GND)?

If possible I am thinking both 5V (pin2 and pin4) and 3.3V (pin1).

 

Thanks

 

I don't know especially for the 4B but other models usually can be powered trough GPIO pins 2 and 6 which are shorted to the other powering option like barrel  plug or microUSB/USB-C. So the consumption is basically limited by the line resistance and the power supply.