Since my angular sensor should be powered by 5V voltage, I use a 5V DC Li battery as the power supply of MKR1000 board (connectiong the VIN and GND pins of the board with the positive and negative poles of the battery). After some time of usage, it was found that:
1 first MKR1000 board was damaged; it can not be recognized by the computer again.
2 second MKR1000 board was abnormal. For instance, the voltage of VCC and 5V pins are less than 3 V and 4.7 V respectively. Also, the readings of the angular sensor was not stable even there is no rotation; however, the readings of the same angular sensor was stable when another Arduino board is used.
Actually, I have used MKR 1000 boards for several years and they run smoothly if they are powered by USB cable or pins from PH2.0. May I know whether you have encountered the similar condition? I failed to find the causes of the facults. Thanks a lot for any help.