Category:IIC

• 总线， 不同设备地址

Schematic

• 

  ADC and IO expander board SCH

• 

  Sensor pack board SCH

• 

  IIC MISC (OLED RTC EEPROM) board SCH

• 

  TI series IIC sensors

Expansion

• 

  MCP23017 to GPIOs expansion, SCH

IIC Devices

Category	Alternative 1	Default IIC Utility Address
Pressure	BMP280	Use BMP180
Temperature huminity	AM2322
Light sensor	BH1750
RTC	DS1307
Analog Expander	PCF8591	0x48
GPIO Explander	PCF8574T, MCP23008	0x20
I2C Expander	tca9548a
Servo Drive	PCA9685
EEPROM	AT24C256
Display	IIC OLED
Accelerator	ADXL345
Segment Display	TM1650
Char Display	PCF8574 1602
ADC	ADS1110

• I2C device found at address 0x3C  ! // IIC OLED
• I2C device found at address 0x75  ! // IP5306
• ST25DV ............................................0x2D.....................................0x53...0x57........................................
• EEPROM + RTC + OLED ...........................................................0x3C...................0x50.......................0x68.......................
• AHT20: 0x38
• K23-1025 - 0x1F
• EEPROM 0x50

I2C 3-in-1 Breakout

I2C device found at address 0x3C  !  // this is OLED 128x32
I2C device found at address 0x50  !
I2C device found at address 0x68  !

• To use on board 128x32 OLED, define first:

//   #define SSD1306_128_64
 #define SSD1306_128_32
//   #define SSD1306_96_16

• Demo code read EEPROM and display on OLED, please wait 2-3 seconds until OLED initated after restart

i2cdetect

• Linux (RPI)

i2cdetect -y 1

• Arduino scanner skecth, please find in our arduino github

• 

  linux raspberry pi scanner

• 

  arduino I2C scanner

• Nano -> i2cdetect -r -y 0

EEPROM Read

Status	Hardware	Code Next Step	Hardware Next
08	already send start	send SLA+R	Do code and wait ACK
40	already send SLA+R + got ACK	X	X
50	Get REV data +ACK	Example
58	Get REV data + NO ACK	Example

Wire

• Wire.begin(4, 5);