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Then, we assign nextTick as 1000 - (error) + millis (), which may end up being, say, 998ms from now (millis ()) if there was a 2ms error. 3 Answers Sorted by: 10 millis () is interrupt driven so delay () won't impact it, at least not on an ATmega based board. It's been a while since I did much with arduino but from memory it was a ~20ms variance - which for my purposes was massive. A complication is that at 4mhz the timer counts down once every 64us which doesn't divide evenly into 1000 . On 16 bits Arduino (Uno, Mega, etc), an unsigned long is stored on 4 bytes, or 32 bits. Millis Accuracy Again - Programming Questions - Arduino Forum Accurate Arduino Clock | ContractorWolf.com Once you have mastered the basic blinking leds, simple sensors and buzzing motors, it's time to move on to bigger and better projects. Since millis () will always be greater than nextTick when the "if" is true, we can use millis () - nextTick to find the amount of error. There is a volatile 32-bit global counter variable called timer0_millis that is maintained/updated by the TIMER0_OVF_vect ISR, and the millis function itself just stops interrupts briefly to read that value into a local variable and return it. Really, really not. Using millis() Instead of delay() for Arduino Projects More about millis () later. Duemilanove and Nano . which processes complex 6-axis MotionFusion algorithms. How To Detect Objects with HC-SR04 Ultrasonic Sensor, Arduino and millis() If you need to trigger an action exactly every 1 second then you should try using an Interrupt Service Routine (ISR). This is a cheap oscillation component that is OK for most . LED の輝度が上がるまでの時間を設定します。. How to use a ToF laser ranging sensor with Arduino and Wisblock How accurate is millis()? - Project Guidance - Arduino Forum Returns the number of microseconds since the Arduino board began running the current program.