undefined reference to `analogReference'

[Mycah]

`Arduino: 1.6.13 (Windows 7), Board: "NodeMCU 1.0 (ESP-12E Module), 80 MHz, 115200, 4M (3M SPIFFS)"

Build options changed, rebuilding all
libraries\THERMISTOR\thermistor.cpp.o:(.text._ZN10THERMISTOR4readEv+0x34): undefined reference to `analogReference'

libraries\THERMISTOR\thermistor.cpp.o:(.text._ZN10THERMISTOR4readEv+0x6f): undefined reference to `analogReference'

collect2.exe: error: ld returned 1 exit status

exit status 1
Error compiling for board NodeMCU 1.0 (ESP-12E Module).

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.`

Attempting to build your sample on a NodeMCU 1.0 using the ESP-12E with the arduino firmware returns this error.

From what I've read the ESP-12E should support this function, it does have an analog read pin.

Using 2.3.0 (latest as of now) of: https://github.com/esp8266/Arduino

Any suggestions?

[tmeysson]

2 years later, same issue with an ESP32.
Quick and dirty fix: go into thermistor.cpp and comment out the analogReference call.
A bit better: put it into an #ifndef 'something' depending on the board you have that problem with.