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I have a working program using timer 1, but when I add the code to MySensor project, it hang after the call to initialize the timer 1...
question: is Timer 1 used in MySensor or is available for project use??
Are you sleeping the node using the provided sleep-methods?
Might be LowPowerLab library doing something to Timer1 https://github.com/mysensors/Arduino/blob/master/libraries/MySensors/utility/LowPower.cpp