MicroPython Forum (Archive)

Not sure about commit but here is write code.

Wire.beginTransmission(deviceaddress);
Wire.write((int)(eeaddress >> 8)); // MSB
Wire.write((int)(eeaddress & 0xFF)); // LSB
Wire.write(data);
Wire.endTransmission();
delay(5);

Sorry didn't make that very clear. I wrote random values to eeprom with Arduino and the values read back were OK. After trying to read them on the ESP all I got was xff at each memory location. When read again on the Arduino all addresses returned xff.

Yes, I am connecting with pull-up resistors. After more tests I find if I write the eeprom with Arduino and only read it with ESP the values are all xff however, if I then read the eeprom with Arduino, all the memory has been changed to xff.

Sorry, don't have a logic analyser. I am connecting directly to an eeprom chip via 4.7k resistors. Have tried other values, other frequencies and two different eeproms which both work with Arduino.

Seems to be a problem as I am unable to read an eeprom on my ESP-12.
I can read/write ok on Arduino but can't read it back on ESP.
I get the result... xff from every location.

Thanks for that. I will just have to use resistors.

I am running some ESP's on batteries. Is there any way to read battery voltage like I can in Arduino...

ADC_MODE(ADC_VCC)
ESP.getVcc()

or will I have to read the voltage via a resistor divider on the ADC pin?

Thanks very much for that. I would never have got there with google. I am new to python and have only coded with Arduino.
Thanks again......Mick

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