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Benchmark of internal time precision

Model range of 60 sec delay() call avg. duration of 60 sec delay() call
Arduino 101 59998-59999 59998,5625
Arduino Mega 2560 (clone) 59989-59994 59991,75


Benchmark of digital sensor read

Benchmark of analog sensor read

Benchmark of pi calculation



Test programs: Python program for measuring response time

import time
import serial
def millis():
    return int(round(time.time() * 1000))
ser = serial.Serial('/dev/ttyACM0', 9600)
while True:
	start = millis()
	data= "recv: "+ser.readline()	
	end = millis()
	print (end-start)
	print data


Time precision benchmark

void setup() {
  Serial.begin(9600);
}

void loop() { 

  while (true) {
    unsigned long start = millis();
    delay(60000);
    unsigned elap = millis() - start;
    Serial.println(elap);
  }
}