EmonTxV3CM compile error - Arduino IDE

Hardware emonTx
1

Hi,

I downloaded the latest FW, and tried to compile under Win/Arduino IDE, but i get this error:

“Arduino: 1.8.19 (Windows 10), Board: “Arduino Uno”
libraries\EmonLibCM-master\emonLibCM.cpp.o (symbol from plugin): In function DS18B20_PWR': (.text+0x0): multiple definition of assumedVrms’
sketch\EmonTxV3CM.ino.cpp.o (symbol from plugin):(.text+0x0): first defined here
collect2.exe: error: ld returned 1 exit status
exit status 1
Error compiling for board Arduino Uno.”

Idon’t know, how can I solve it, please, help me!

Peter

2

Now i tried this version, and now I can compile:
https://community.openenergymonitor.org/uploads/short-url/tPz0uVfDxInGNWuPgvVhwchs6IG.zip

3

I think your latest software isn’t. I seem to remember renaming the variable to avoid this, it was quite a while ago - yes: “Version 2.1.2 7/8/2021 ‘assumedACVoltage’ was ‘assumedVrms’ (name conflict in some sketches).”
So I suggest you get the real latest version from the emonLibCM topic on the forum. That should solve your problem. You should always go there for the latest version.

4

Thanks Robert, you are right.
At first I downloaded an older version from here: GitHub - openenergymonitor/EmonTxV3CM: EmonTxV3 Continuous Monitoring Firmware (Default shipped EmonTxV3 firmware)
On this readme.md I found a link (GitHub - openenergymonitor/EmonLibCM: Continuous Monitoring alternative to EmonLib), which isn’t the latest version of this.

Have a nice day,
Peter

5

A cleaner way to fix this is to declare the assumedVrms variable as static in emonLibCM.cpp - this restricts the name scope, and avoids any naming clashes in future as well :slight_smile: