ESP8266 looping errror

Question

I am new to the NodeMCU ESP8266 board and and been playing around with it am a little stumped as to what my issue within this code is. The code works on Arduino and was originally written for an Arduino Uno, but when I tried it on a ESP8266 board I get a serial monitor error? I think it has something to do with how I am looping at the bottom, but not sure thanks for any help.

const int MotionSense = D2;
const int MotionLed = D3;
const int NoMotionLed = D7;
int MotionState = 0;
int MotionCheck = 0;
int onTime = 0;
const unsigned long timerCounter = 100;
const unsigned long timer = 1000;
unsigned long prevTime = 0;

void setup() {
  pinMode(MotionLed, OUTPUT);
  pinMode(NoMotionLed, OUTPUT);
  pinMode(MotionSense, INPUT);
  Serial.begin(19200);
}

void loop() {
  //while no motion stay off
  MotionState = digitalRead(MotionSense);
  while (MotionState == LOW) {
    digitalWrite(MotionLed, LOW);
    digitalWrite(NoMotionLed, HIGH);
    MotionState = digitalRead(MotionSense);
  }
  //turn back on
  digitalWrite(MotionLed, HIGH);
  digitalWrite(NoMotionLed, LOW);


  onTime = 0;
  while (onTime < timer) {
    unsigned long currentTime = millis();
    if ((currentTime - prevTime) >= (timerCounter)) {
    MotionState = digitalRead(MotionSense);
   
    if (MotionState == HIGH){
       onTime = 0;
    } else {
       onTime +=1;
    }
    Serial.println(onTime);
    prevTime = millis();
  }
}

anymore help needed here? – Marcel Stör Dec 30 '20 at 11:09 — Marcel Stör, Dec 30 '20 at 11:09

Marcel Stör · Answer 1 · 2020-12-24T15:58:18.517

Your while loop inside the loop starves the essential background functions. Add yield() inside that loop to give control temporarily back to the underlying framework.

while (onTime < timer) {
  yield(); // Do (almost) nothing -- yield to allow ESP8266 background functions
  ...
}

There are some great explanations at https://stackoverflow.com/a/34498165/131929

The ESP8266 runs a lot of utility functions in the background -- keeping WiFi connected, managing the TCP/IP stack, and performing other duties. Blocking these functions from running can cause the ESP8266 to crash and reset itself. To avoid these mysterious resets, avoid long, blocking loops in your sketch.

Source: https://learn.sparkfun.com/tutorials/esp8266-thing-hookup-guide/using-the-arduino-addon

ESP8266 looping errror

1 Answers1