please name the i2c devices you have tested or using

Like to use this post to build up a list of tested i2c devices on ESP8266

please fell free to add devices - thanks.

Monochrome 128x32 I2C OLED graphic display, adafruit PRODUCT ID: 931

o comes with integrated 4.7k pull-ups

o module SSD1306

o ESP8266-12E&F

o D4 - SDA and D5 - SCL

works without problems

It might be useful to document which board and pins were used as well, as this seems to be the tricky part!

@Wilberforce added board and pins - thanks for that hint

Adafruit HTU21D-F Temperature & Humidity Sensor Breakout Board
PRODUCT ID: 1899
https://www.adafruit.com/products/1899

working on esp8266-01
sda - D0 scl - D2 or
sda - D2 scl -D0
works without problems.

By mistake, I run esp8266-01 with 5 volts for a week before I discovered that it only should have 3V3 volts.

I have made clock streching on it with a copy from @TVE.

AT24 series eeprom

4.7k pullups, on pins 4 and 5.

Esp-12f I think.

Might be useful documenting what's not working too, just a thought, and, crucially, which MCU you are using!

@Frida - wow, can you please share the clock stretching code ?

Working for me:

• MCP23008 port expander
  
• Honeywell SSC MAN 060PG 2A3 pressure sensor
  
• Bosch BME180
  All using I2C1.setup({scl:D12,sda:D13}); and a 4.7K resistor to 3.3v.
  

• MLX90614 INFRA RED THERMOMETER

• comes with integrated 4.7k pullups

• using snippets from module 'MLX90614'

• FM Radio module RDA5807M
  
• On an ESP8266-12F
  
• Using I2C1.setup({sda: D4, scl: D5});
  
• NOT working :(
  
  

Works fine in Mongoose IoT (formerly smart.js)

Will try to build the mentioned clock stretching code soon to see if that can make it work.

If your I2C device is not working the most helpful would be to hook up a logic state analyzer. That'll tell you what is going on...

would be to hook up a logic state analyzer

Even just sticking LEDs on the 2 pins (so they are normally off) would let you check whether you had the right ones.

It might be useful to document which board and pins were used as well, as this seems to be the tricky part!>
In addition, a code snippet might help people too!

ESP8266 - PCF8574 8 bit IO expander from DX.com

pinMode(NodeMCU.D5,'input_pullup');
pinMode(NodeMCU.D4,'input_pullup');

I2C1.setup({scl:NodeMCU.D5, sda:NodeMCU.D4});
var lcd = require("HD44780").connectI2C(I2C1);
lcd.print("Hello World!");
lcd.setCursor(0,1);
lcd.print("ESP8266!");

I'm not sure if the pull up lines even have an effect, as it works without them too!

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TI INA3221: "INA3221 Triple-Channel, High-Side Measurement, Shunt and Bus Voltage Monitor"
a.- (Dev Kit by SwitchDoc Labs : http://store.switchdoc.com/ina3221-breakout-board-3-channel-current-voltage-monitor-grove-headers-compare-to-ina219-grove-headers/ )

b.- I2C works with: I2C1.setup({sda:D4,scl:D5});

c.- Physical Pinouts are SCL/D1 and SDA/D2 (3 places on the board)

d.- PullUps @ 4k1 Ohms

E.- Work In Progress

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Nice small monochrome I2C 0.96 and 1.3 OLED - the 0.96 is my favorite one.

o each comes with integrated 4.7k pullups

o used module SSD1306

o on ESP8266-12E&F

o D4 - SDA and D5 - SCL

works without problems

TLS2561 - LIGHT-TO-DIGITAL CONVERTER from Adafruit

• integrated 4.7k pullups

• used module TSL2561

• on ESP8266-04,12E/F

• D4 - SDA and D5 - SCL

works without problems

PN532 - NFC/RFID MODULE

• integrated 4.7k pullups

• used module PN532

• on ESP8266-04,12E/F

• D4 - SDA and D5 - SCL

works only with clock stretching by @Frida, have to run some more test and then will create a PR

>print(nfc.getVersion());
{
  "chip": "PN532",
  "firmware": "1.6",
  "support": 7 }

BH1750 Light Sensor

• not sure about pullups so I tried it without any
  
• BH1750FVI from ebay
  
• on ESP 12F
  

• D4 - SDA and D5 - SCL

  I2C1.setup({sda:D4,scl:D5});
  var bh=require("BH1750").connect(I2C1);
  bh.start(3);
  bh.read();
  

no probs

clock stretching by @Frida will be available with 1v92

Working for me:

Bosch BMP280
I2C1.setup({sda: D4, scl: D5} ); with SD0 to low address 118; to high address 119

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DS1307 and AT24C32 on TinyRTC

• integrated 3.73 pullups
  
• used module DS3231 - work perfect with DS1307
  

• tested on ESP8266-04,12E/F 1v95

  var SDA = D5, SCL = D4; // ESP8266
  I2C1.setup({scl:SCL,sda:SDA, bitrate:100000});
  
  var rtc = require("DS3231").connect(I2C1, { DST : true });
  rtc.setDate(Date().getDate(),Date().getMonth(),Date().getFullYear());
  rtc.setTime(Date().getHours(),Date().getMinutes(), Date().getSeconds());
  
  setInterval(function() {
  console.log(rtc.readDateTime());
  }, 1000);
  
  /* output
  23/00/18 22:06:20
  23/00/18 22:06:30
  23/00/18 22:06:40
  */
  

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