ESP8266 - Write Single Field
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Hello
I used the example program to write data to ThingSpeak and I have the following compilation error
c:/users/name/.platformio/packages/toolchain-xtensa/bin/../lib/gcc/xtensa-lx106-elf/4.8.2/../../../../xtensa-lx106-elf/bin/ld.exe: .pio\build\nodemcuv2\src\main.cpp.o:(.text.setup+0xc): undefined reference to `ThingSpeak'
collect2.exe: error: ld returned 1 exit status
*** [.pio\build\nodemcuv2\firmware.elf] Error 1
Here my include files
#include <Arduino.h>
#include <ESP8266WiFi.h>
#include <secrets.h>
#include <ThingSpeak.h> // always include thingspeak header file after other header files and custom macros
I've searched on the web but I can't find a solution. If anyone can help me. Thank you in advance.
回答（1 个）
You don't have the ThingSpeak library in your list of project dependencies in your PlatformIO.ini file. You need to add the ThingSpeak library like this:
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