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Arduino i2c connection
Posted:
Fri Feb 19, 2016 5:07 amby bram
Hey,
I want to use a Arduino to communicate with my ESP8266 over i2c. My only concern is that the Arduino I am using is 5v. Could I use this or do I need to use a level shifter?
Re: Arduino i2c connection
Posted:
Fri Feb 19, 2016 8:42 amby jra
Level shifter is one way to do it. Using a 3v3 Arduino ProMini is another.
Re: Arduino i2c connection
Posted:
Fri Feb 19, 2016 8:47 amby bram
But would I damage the esp when I use the arduin with i2c when powering the esp with a 3v power supply amd connecting ground together?
Re: Arduino i2c connection
Posted:
Fri Feb 19, 2016 9:11 amby martinayotte
What do you means by "damage" ?
The I2C Level Shifter has 2 power input, on 5V for the Arduino side, and one 3.3V on the ESP side.
The I2C bus has PullUps, so when it is idle, lines are at HIGH level.