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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.