@korttoma said: Try running the "ClearEepromConfig" example sketch from MySensors examples and then try your sketch again. Might be that there is an old "NODE_ID" being used that is conflicting with another node. If you want to use static NODE_ID you should put the following before the MySensors.h include in your sketch: #define MY_NODE_ID 14 You are also stil missing the #define MY_RADIO_NRF24 Before the MySensors include that @hek pointed out. ^^ this - I've had this happen before (just last night actually) but i recalled from when it happened in the past, found out it was using a dupe ID, ran eeprom sketch.. good to go now.