3 Replies Latest reply on Mar 19, 2015 11:57 AM by Intel_Peter

    I2C doesn't work using multple PCF8574.




      I am using Edison Arduino board kit, node.js with mraa.


      When I used I2C connected with single PCF8574 to expand I/O ports, It worked ok.


      but if I use two PCF8574 on same I2C bus line, It doesn't work.


      I already tried to set  pullup resister (4.7kOhm) . and tried to set pullup using the files  /sys/kernel/debug/gpio_debug/gpio28, :/sys/kernel/debug/gpio_debug/gpio27.


      but still doesn't work.  what am I supposed to do?


      Thanks for read this.