I am using ESP8266-12E with a PCF8574 as an I/O Pins Extender. There are videos on youtube to use the PCF8574 with an ESP8266-01, but my problem is that I'm unable to analyze the pin connections with an ESP8266-12E. In the youtube tutorial it is said that the GPIO0 AND GPIO2 will go to the SDA and SLC pins of the PCF8574, but then, in the case of ESP8266-12E, the pins will go to the PCF8547.

Thanks in advance.

  • What is the link to Arduino UNO as you tagged your question?
    – jfpoilpret
    Nov 12, 2016 at 9:45
  • sorry , i thought people who knows arduino things might also know this. Nov 12, 2016 at 12:52
  • The '8C-ESP8266 Interface I2C' document may help, if you have access to it. It's available on Scribd, which is non-free. One can see the first page of '8C-ESP8266 Interface I2C' without a Scribd subscription Nov 12, 2016 at 16:06
  • @jwpat7 : thanks . only first page , unfortunately cover page is visible in free. Nov 12, 2016 at 20:09
  • i guess very less people plays with such things o wat! Nov 12, 2016 at 20:10

1 Answer 1


Found the answer . The data sheet of ESP8266-12E explains everything. The pin diagram has the given tags which shows which pins we can use.

  • Would you mind detailing the answer so that your question can bring benefits to other people having the same question?
    – jfpoilpret
    Nov 13, 2016 at 10:16
  • This does not provide an answer to the question. To critique or request clarification from an author, leave a comment below their post. - From Review
    – jfpoilpret
    Nov 13, 2016 at 10:16
  • @jfpoilpret, he IS the author...
    – Dat Ha
    Nov 13, 2016 at 11:42
  • i have added details to the answer. Nov 13, 2016 at 12:43
  • @DatHa this comment was automatically generated from my delete vote; please don't think I can be so stupid, thanks.
    – jfpoilpret
    Nov 13, 2016 at 13:23

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