yep serial.print is sending 0.
now i altered the program a bit, i made 2 integer temp1 and temp2.
and made this at the bottom of the sketch.
sensors.requestTemperatures();
temp1 = round(sensors.getTempCByIndex(0)*10);
temp2 = round(sensors.getTempCByIndex(1)*10);
sprintf(payload,"{Temp_buiten_camping:%d,Temp_binnen_camping:%d}",temp1,temp2);
Serial.print(payload);
ether.browseUrl(PSTR("/emoncms/input/post.json?apikey=913f557706d069745bfe8dac70040261&json="), payload, website, my_callback);