I2C and power - Raspberry Pi Forums

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hello,
i'am trying drive servo motor through adafruit 16-channel 12-bit pwm/servo driver - i2c interface - pca9685 board.
power added on board 4 electric battery 1,5 v. full voltage around 4.9 v.
can't access i2c device when run "ls /dev/i2c*" : i2c activated, blacklist cleaned, etc...
2 questions :
- i2c device exist on system if board not connected ?
- can low level power (4.9v) explain i2c not operating ?

best regards.

have loaded i2c-dev module? provides user-space interface i2c devices, , creates /dev/i2c-1?
"sudo modprobe i2c-dev" load immediately, , add "i2c-dev" /etc/modules ensure loads automatically after reboot.


raspberrypi



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