Do i need to calibrate 4 in 1 ESC for Voxl 2?
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 Do i need to calibrate 4 in 1 ESC for Voxl 2? i have a M0134. 
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 @AP123 SDK 1.1.1 
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 HI @AP123, you can find information about calibration for M0134 here. The calibration procedure in voxl2_io driver in voxl-px4 is not designed to work with 4 in 1 ESC, it is for off the shelf ESCs such as BLHeli. Additional information about if you need to calibrate your 4 in 1 ESC can be found in this repo. I believe we already provide parameters (calibration) for 4 in 1 ESC for certain motor/propeller combinations which can be loaded via voxl-escutility on voxl2.From tech docs: Q: When is ESC Calibration Required? A: When switching battery types (from 3S LiPo to 4S LiPo, etc), or when a new type of motor or new type of propeller is used.