typedef struct blink_rate {
	uint16_t on  = 500;
	uint16_t off = 500;
} blink_rate;

blink_rate rate;

uint32_t currentMillis;
bool led_builtin_status = LOW;

void setup(void)
{
	rate.on = 20;
	rate.off = 980;
	currentMillis = millis();
	pinMode(LED_BUILTIN, OUTPUT);
	digitalWrite(LED_BUILTIN, LOW);
	led_builtin_status = LOW;
}



void loop(void)
{
	if (led_builtin_status == HIGH)
		if ((millis() - currentMillis) > rate.on)
		{
			digitalWrite(LED_BUILTIN, LOW);
			currentMillis = millis();
		}
	if (led_builtin_status == LOW)
		if ((millis() - currentMillis) > rate.off)
		{
			digitalWrite(LED_BUILTIN, HIGH);
			currentMillis = millis();
		}


}