PCF8574 and EV3
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Author:  Bichon [ Mon Mar 25, 2019 5:20 am ]
Post subject:  PCF8574 and EV3


I don't know if this forum is still active, but I try to ask for help :wink:

Until now I was using a PCF8574 home made i2c sensor to multiplex on/off RCX sensors. This works fine since years on my NXT, event with that latest version of RobotC.

I tried to used this sensor with my EV3 with the same program and it doesn't work at all. After having tried lots of modification, I finally used the i2C Test utility.
I send only a byte to the right port . On my NXT, it answers the states of my contactors in a reply byte. On my EV3, it answers a byte that has no sense and doesn't represents the states of my inputs. I tried all configurations of input ports.
Can someone explain me how it is possible to have such behavior difference between NXT and EV3 for a so simple i2C communication test? Is it possible that my electronic stuff has issues not viewable on NXT but only on EV3? Is it a known issue on RobotC?

Thx for your help.

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