Do I need to implement the IRQ on future PCBs for nodes?

[sineverba]

Hi,
the title say all...
I have fun designing PCB for nodes. But, as title, do I need to implement the IRQ for them?

And, if yes, for the ATMEGA328 and NRF24 radio, what PIN are available for it? 'Cause, for example, I have a node very populated (interrupt, reset, tx leds, 2 sensors, 1 relay, etc etc) so many Atmega PINs are not available.

Thank you very much!

[hek]

Probably good to have it routed. It's already possible to use the IRQ for RF24 by enabling MY_RX_MESSAGE_BUFFER_FEATURE (dev-branch)

[sineverba]

@hek thank you. For atmega 328 only D2 and D3 are available, all' right?

[scalz]

for this specific usecase (radio irq), yes it is better to use D2/D3.

[gohan]

Make a route for irq with a couple of pads that you can bridge them to enable the irq to either d2 or d3 so that you can disable the irq feature in case you need those pins for something else.