ESP8266 Community Forum

- Tue Dec 04, 2018 5:05 pm #79413

But my board is NodemCu with micro ESP8266.

So?

A NodeMCU (development board) uses an ESP-12E (module), which has an ESP8266 (chip) inside:

An Arduino is development board with an Atmel (chip):

It is possible to program the ESP8266 (the first picture) with code for an Arduino (the second picture), but then you need to change some things to make it compatible.
The most common changes are inserting yield()-commands (or delay(0)) in tight loops.

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Dear thank you very much,
But I have no idea how to do it, could you please send me an example?
Thanks very much!!!

- Wed Dec 05, 2018 4:35 am #79421

But I have no idea how to do it, could you please send me an example?

We're here to help others, not to write code for others.

The solution is like I explained earlier, but I'll tell you the general process:

• Search the code for "For" and "While" loops.
  In the block that belongs to the loop (the code between the { and } accolades following the loop-statement), see if there are already any calls to either yield() or delay().
  
  • If it already has: you (generally) don't have to do anything with that block
  • If it has not: insert a yield() or delay(0) somewhere in that block
• The main loop() is also just a loop (like a for and a while) and inside this loop there also needs to be at least a yield() or delay(0) inserted if not already there

It's not always necessary to insert a yield() or delay() in every loop: with very short loops or in nested loops you only have to yield() or delay() less often.

The reason behind having to use yield() or delay() is to reset the (software) watchdog of the WiFi stack: if it isn't reset every 3 seconds (or so) it will trip and the entire ESP will be reset.
Some helpful reading: ESP8266 Watchdogs in Arduino

Assumption is the mother of all f*ckups. At least: that's what I'm assuming.