Wire library documentation update

[sanchosk]

Can someone, please, update the front-page readme info to reflect the real i2c communication start?
First of all, Wire.begin(0,2) as described in the example will not compile.
There is other function, called Wire.pins, that should be used for setting the SDA SCL pins.
And one needs to issue also Wire.speed command, otherwise my i2c devices did not work.

[TheKitty]

I second this, the only way I can compile is
Wire.pins(0,2); // SDA, SCL
Wire.begin();

as Wire.begin(0,2) throws an argument error. It looks like there are issues in the Wire.cpp but I cannot provide you with specifics.

A good example or two would help alot.

[itProfi]

Please, update the front-page readme info to reflect the real i2c communication start...

[itProfi]

Please, update the front-page readme info to reflect the real i2c communication start...

[igrr]

Wire.begin(sda, scl) works fine now in the latest version.

[AdamMiltonBarker]

@igrr can you direct me to some example code please I am struggling to find any docs on connecting the elechouse module 3

[chaeplin]

@AdamMiltonBarker Is 'elechouse module 3' this one http://www.elechouse.com/elechouse/index.php?main_page=product_info&cPath=168_170&products_id=2254

[AdamMiltonBarker]

No mate it is this, I have already developed the device on an Arduino, then moved to my second stage of project which included standalone ATMEGA but docs were thin and realised it could be done with ESP but same situation docs are thin and cannot get it working

https://dangerousthings.com/wp-content/uploads/2013/12/PN532_-Manual_V3.pdf

[chaeplin]

@AdamMiltonBarker
Elechouse has lib for PN532.
example) https://github.com/elechouse/PN532/blob/PN532_HSU/NDEF/examples/ReadTag/ReadTag.ino
I think one more line needed with ESP.

void setup(void) {
    Serial.begin(9600);
    Serial.println("NDEF Reader");
    //Wire.begin(sda, sol)
    Wire.begin(0, 2) // <------ this
    nfc.begin();
}

[AdamMiltonBarker]

One sec I didnt think about that. will try run my old code on there.

[AdamMiltonBarker]

No it is not finding it connected to esp, this topic I am replying to is what I need to do, somehow ;)

[chaeplin]

@AdamMiltonBarker Sorry.
Have you checked this line ? https://github.com/elechouse/PN532/blob/PN532_HSU/PN532_I2C/PN532_I2C.cpp#L17

[igrr]

Also make sure you have pull up resistors on SDA and SCL lines. They aren't required on Arduino boards but are necessary on the ESP, in most cases.