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Category:IIC - Revision history
2026-07-22T10:28:15Z
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Chao: /* = EEPROM Read */
2021-08-06T14:51:20Z
<p><span dir="auto"><span class="autocomment">= EEPROM Read</span></span></p>
<p><b>New page</b></p><div>* 总线， 不同设备地址<br />
== Schematic ==<br />
<gallery><br />
File:Adio_iic_expander.png | ADC and IO expander board SCH<br />
File:IIC_utility_sensor_pack.png | Sensor pack board SCH<br />
File:IIC_MISC_Board_SCH.png | IIC MISC (OLED RTC EEPROM) board SCH<br />
File:TI_IIC_sensor_01.png | TI series IIC sensors<br />
</gallery><br />
Expansion <br />
<gallery><br />
File:MCP23017_SCH.png | MCP23017 to GPIOs expansion, SCH<br />
</gallery><br />
== IIC Devices ==<br />
{| class="wikitable sortable"<br />
|-<br />
! Category !! Alternative 1 !! Default IIC Utility Address <br />
|-<br />
| Pressure || BMP280 || Use BMP180 <br />
|-<br />
| Temperature huminity || AM2322<br />
|-<br />
| Light sensor || BH1750 || <br />
|-<br />
| RTC || DS1307 <br />
|-<br />
| Analog Expander || PCF8591 || 0x48<br />
|-<br />
| GPIO Explander || PCF8574T, MCP23008 || 0x20<br />
|-<br />
| I2C Expander || tca9548a<br />
|-<br />
| Servo Drive || PCA9685<br />
|-<br />
| EEPROM || AT24C256 || <br />
|-<br />
| Display || IIC OLED<br />
|-<br />
| Accelerator || ADXL345 <br />
|-<br />
| Segment Display || TM1650<br />
|-<br />
| Char Display || PCF8574 1602<br />
|-<br />
| ADC || ADS1110<br />
|}<br />
* I2C device found at address 0x3C ! // IIC OLED<br />
* I2C device found at address 0x75 ! // IP5306<br />
* ST25DV ............................................0x2D.....................................0x53...0x57........................................<br />
* EEPROM + RTC + OLED ...........................................................0x3C...................0x50.......................0x68.......................<br />
* AHT20: 0x38<br />
* K23-1025 - 0x1F<br />
* EEPROM 0x50<br />
<br />
== I2C 3-in-1 Breakout ==<br />
I2C device found at address 0x3C ! // this is OLED 128x32<br />
I2C device found at address 0x50 !<br />
I2C device found at address 0x68 !<br />
<br />
* To use on board 128x32 OLED, define first:<br />
// #define SSD1306_128_64<br />
#define SSD1306_128_32<br />
// #define SSD1306_96_16<br />
* Demo code read EEPROM and display on OLED, please wait 2-3 seconds until OLED initated after restart<br />
<br />
== i2cdetect ==<br />
* Linux (RPI)<br />
i2cdetect -y 1<br />
* Arduino scanner skecth, please find in our arduino github<br />
<gallery><br />
File:I2cdetect.png | linux raspberry pi scanner <br />
File:Arduino_I2c_Scanner.png | arduino I2C scanner <br />
</gallery><br />
<br />
* Nano -> i2cdetect -r -y 0<br />
<br />
<br />
== EEPROM Read ==<br />
{| class="wikitable sortable"<br />
|-<br />
! Status !! Hardware !! Code Next Step !! Hardware Next<br />
|-<br />
| 08 || already send start || send SLA+R || Do code and wait ACK<br />
|-<br />
| 40 || already send SLA+R + got ACK || X || X<br />
|-<br />
| 50 || Get REV data +ACK || Example<br />
|-<br />
| 58 || Get REV data + NO ACK || Example<br />
|}<br />
<br />
== Wire ==<br />
* Wire.begin(4, 5);<br />
<br />
[[category: Interface]]</div>
Chao