Posted at 2016-05-09 by @MaBecker

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

Posted at 2016-05-09 by Wilberforce

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

Posted at 2016-05-09 by @MaBecker

@wilberforce added board and pins - thanks for that hint

Posted at 2016-05-09 by Frida

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.

Posted at 2016-05-09 by DrAzzy

AT24 series eeprom

4.7k pullups, on pins 4 and 5.

Esp-12f I think.

Posted at 2016-05-09 by davem

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

Posted at 2016-05-09 by @MaBecker

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

Posted at 2016-05-09 by tve

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.

Posted at 2016-05-10 by @MaBecker

• MLX90614 INFRA RED THERMOMETER

• comes with integrated 4.7k pullups

• using snippets from module 'MLX90614'

Posted at 2016-05-11 by virtualcodewarrior

• 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.

Posted at 2016-05-11 by tve

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...

Posted at 2016-05-11 by @gfwilliams

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.

Posted at 2016-05-19 by CrashingDutchman

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!

Posted at 2016-05-21 by Wilberforce

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!

Attachments:

• IMG_0190.JPG

Posted at 2016-07-16 by ExperimentalZeros

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

Attachments:

• INA3221.JPG

Posted at 2016-10-12 by @MaBecker

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

Posted at 2017-01-23 by @MaBecker

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

Posted at 2017-01-26 by @MaBecker

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 }

Posted at 2017-03-18 by countxerox

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

Posted at 2017-03-18 by @MaBecker

clock stretching by @frida will be available with 1v92

Posted at 2017-08-10 by cervolen

Working for me:

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

Attachments:

• bmp280.JPG

Posted at 2018-01-23 by @MaBecker

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
*/

Attachments:

• SKU099560L.jpg