Nano RF onboard leds

[traderjoe]

So I'm using an Nano RF for a project. There's are these onboard leds

When I power up the board using USB I get a red led in the red box and a green led in the green box. And everything (IO) works.

When I power up the board using an old (old 9v. Measured to output 7.2vdc) I get a red led at the red box but green box gets no LED. None of my IO works. The datasheet says recommended VIN is 7-12 vdc. Is 7.2 still undervoltage? What do those LEDS mean?

[markd833]

Here's a view of another RF-Nano board which might help you out:

The silkscreen for that board has the letters R, T, P & L.

I would hazard a guess that the LEDs are:

R = Receive (likely 328P serial port rather than nRF24L01)
T = Transmit (likely 328P serial port rather than nRF24L01)
P = Power
L = Built-in LED

Which I think is what you have on a Nano.