By: John Laird

In the Particle Photon Library I can’t get the last two examples WriteMultipleVoltages and WriteVoltage (the ones I need) to compile. I get the following error:

In function `ThingSpeakClass::convertFloatToChar(float, char*)’: ThingSpeak/ThingSpeak.h:1444: undefined reference to `dtostrf(double, signed char, unsigned char, char*)’

The other examples compile fine. Can you fix this?

Thanks!