low power designe
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I have tested the lightsensor(2.0) 's Electric current（int 5v）about 6.5ma,if use 1500mAh 18650 Li battery，it can work about 10 days。How to increase the working hours? thanks!
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The trick is to let the Arduino (and radio) sleep.
https://www.mysensors.org/build/battery should give you a good start. Things are slightly different in MySensors 2.0 (the link is for 1.x) but you just use sleep() instead of gw.sleep().
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Everything you need to know and understand
is written by Nick Gammon:
http://www.gammon.com.au/power
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One addition:
If you power the Arduino directly (e.g. 2x AA = ~3,00V max) you can use ( http://provideyourown.com/2012/secret-arduino-voltmeter-measure-battery-voltage/ ). This will ofc. not work if you power your setup via VoltageRegulator.
In addition to mfalkvidd's link have alook at https://www.mysensors.org/download/sensor_api_20#sleeping
It describes how to use the sleep function to put the Arduino+Radio in sleep mode.
