qc22v.ino

#include <Arduino.h>
#include <avr/sleep.h>

const int D_PLUS  = 11;
const int D_MINUS = 12;

/**
 * Arduino nano has 5V regulated power, so required voltages are generated with:
 * 3.3V: 4.7kΩ / 9.1kΩ
 * 0.6V: 1.1kΩ / 150Ω
 *
 */

void setup() {
  // wait until stable connection
  Serial.begin(9600);
  delay(1000);

  Serial.println("Reset line");
  // reset line
  pinMode(D_PLUS, OUTPUT);
  pinMode(D_MINUS, OUTPUT);
  digitalWrite(D_PLUS, LOW);
  digitalWrite(D_MINUS, LOW);
  delay(100);

  Serial.println("set 0.6V to D+/D- for 1.25s");
  // D+ and D- to 0.6V for 1.25s
  digitalWrite(D_PLUS, HIGH);
  digitalWrite(D_MINUS, HIGH);
  delay(1250);

  Serial.println("set low for D- for 1ms");
  // D- to 0V for 1ms
  digitalWrite(D_MINUS, LOW);
  delay(100);

  Serial.println("set D- HIGH");
  // Set voltage
  digitalWrite(D_MINUS, HIGH);

  Serial.println("go Down");
  Serial.flush();
  set_sleep_mode(SLEEP_MODE_PWR_DOWN);
  sleep_mode();
}

void loop() {
}