thanks, I use esp01 in my project and need to use one port extender!
can you explain more or send me references about sink that you said?
wvmarle:
Put something else on your port extender. Something that's now on one of the other 18 I/O pins of an Uno. Most peripherals can be interfaced that way just fine, the DHT22 is one of the few exceptions. Just remember that the PCF8574 can't source any significant current, only sink.
thanks, I use esp01 in my project and need to use one port extender!
can you explain more or send me references about sink that you said?