please rename this scheduler e.g. to esp8266Scheduler

[shiftleftplusone]

just observed that this anmaped/esp8266-scheduler has the same lib name "Scheduler" ( #include <Scheduler.h> ) as the cmaglie (and the origonal mpatil) version which is already installed on my system and would overwrite them immediately - so it's no choice unless there would be a way to rename it before (e.g., #include <esp8266Scheduler.h> )

[anmaped]

Could you elaborate more on the issue? Your environment etc..

[shiftleftplusone]

I am working with several boards, e.g. also with the Arduino Due and Zero and now also with the esp8266. Both Scheduler libs for Due/Zero (Scheduler by c. maglie, https://github.com/arduino-libraries/Scheduler) and nodemcu (::this) have to be in the libraries folder (Sketchbook or portable folder) and so they must have different names so that it will be possible to #include them arbitrarily.

[shiftleftplusone]

I still can't run the esp8266-Scheduler as I already have installed the Scheduler form C. Maglie.
Arduino IDE 1.8.5 (formerly 1.8.1, 1.82, 1.8.3)

Trying to use esp8266-Scheduler I get the error

WARNUNG: Bibliothek Scheduler behauptet auf (sam, samd) Architektur(en) ausgeführt werden zu können und ist möglicherweise inkompatibel mit Ihrem derzeitigen Board, welches auf (esp8266) Architektur(en) ausgeführt wird.

So your Scheduler lib does not work when the Due scheduler by C. Maglie has also been installed.

Most probably this issue happens because both libs are included by
#include <Scheduler.h>
So again. please rename your entire Scheduler lib files by esp8266-Scheduler.*,
to be included by
#include <esp8266-Scheduler.h> // <===== !!!
so that it will not falsely interfere with C. Maglie's Scheduler by identical, ambiguous
#include <Scheduler.h>

[per1234]

@shiftleftplusone please try again with the latest version of this library:
https://github.com/anmaped/esp8266-scheduler/archive/master.zip

All recent versions of the Arduino IDE do architecture based include priority inversion. This means the library with library.properties architectures value matching the architecture of the board you're compiling for gets include priority. The architectures value of the official Arduino Scheduler library is:

architectures=sam,samd

This library's `architectures value is:

esp8266-scheduler/library.properties

Line 9 in 498112d

architectures=avr,sam,samd,esp8266

Therefore this library will have include priority when compiling for ESP8266 and the issue you report should not occur. My suspicion is that you installed an version of the library that's over a year old when it didn't have esp8266 in the architectures list.

Reference:
esp8266/Arduino#3390 (comment)