PGCPSU Testing - pro micro low power

low-power-flash.ino

// WARNING:
// flashing this to your Pro-Micro will make it unavailable for USB flashing 
// because the USB-Endpoint isn't polled during deep sleep. You'll have to 
// recover it by re-flashing the bootloader.
// 
// For example using another Arduino as a ISP:
// https://forum.arduino.cc/index.php?topic=363341.msg2505698#msg2505698
//
// NOTE:
// This sketch requires the library Low-Power to be installed (use package manager):
// https://github.com/rocketscream/Low-Power

#include <LowPower.h>
#define RXLED_PIN 17

void setup() {
  pinMode(RXLED_PIN, OUTPUT);
}

void loop() {  
  LowPower.powerDown(SLEEP_1S, ADC_OFF, BOD_OFF);
  digitalWrite(RXLED_PIN, LOW);   

  LowPower.powerDown(SLEEP_15MS, ADC_OFF, BOD_OFF);
  digitalWrite(RXLED_PIN, HIGH);
}

normal-flash.ino

#define RXLED_PIN 17

void setup() {
  pinMode(RXLED_PIN, OUTPUT);
}

void loop() {  
  delay(1000);
  digitalWrite(RXLED_PIN, LOW);
  delay(15);
  digitalWrite(RXLED_PIN, HIGH);
}