Arduino LORA - pin explain

Projects General Guidance
1

Hello people,

I'm following instructions from this page http://www.instructables.com/id/Get-Started-With-UM402-LoRa-433MHz-UART-Using-Ardu/, and I can't realize what/where is GPIO pin (I'm beginner).

Pin:

  1. GND => GND
  2. VCC => 3.3V
  3. SETA => Any GPIO set to 0 / GND
  4. RXD => Pin 3
  5. TXD => Pin 2
  6. AUX => NC
  7. SETB => Any GPIO set to 0 / GND

Please explain step 3 and 7 what is GPIO set to GND. I'am using LORA SX1278 chip.

Thanks and kind regards :))

Screen Shot 2018-06-25 at 12.25.29.png

2

The instructable is for the UM402 module whcich has a UART front end for the SX127x module.

So you cannot follow that instructable when using a bare SX127x module, the pinouts and software are very different.