Arduino中使用I2C通信可直接调用Wire.h库, 这个库允许Arduino链接其他I2C设备, 链接线有两条, 分别是SDA(数据行)和SCI(时钟线). 各型号Arduino的I2C对应引脚: Arduino Board:I2C / TWI pins Arduino Uno/Ethernet:A4 (SDA), A5 (SCL) Arduino Mega2560:20 (SDA), 21
首先如果你想要使用I2C,你需要先开始I2C通信,他有下面这两个函数: boolbegin(int sda,int scl,uint32_t frequency=0);// returns true, if successful init of i2c busboolbegin(uint8_t slaveAddr,int sda,int scl,uint32_t frequency); 他们共同的参数:sda数据线,scl时钟线,frequency为I2C的频率 函数2...
the SDA (data line) and SCL (clock line) are on the pin headers close to the AREF pin. The Arduino Due has two I2C / TWI interfaces SDA1 and SCL1 are near to the AREF pin and the additional one is on pins 20 and 21.
ESP32 Set I2C Pins (SDA, SCL) When you include the Arduino Core I2C driver “Wire.h“, it’s by default set to I2C0 peripheral, and the (SDA & SCL) lines are set to defaults as shown in the previous section. However, you can still change the ESP32 I2C default pins in the setup...
Arduino通过I2C(PCF8574T)驱动1602LCD Arduino中使用I2C通信可直接调用Wire.h库, 这个库允许Arduino链接其他I2C设备, 链接线有两条, 分别是SDA(数据行)和SCI(时钟线). 各型号Arduino的I2C对应引脚: Arduino Board:I2C / TWI pins Arduino Uno/Ethernet:A4 (SDA), A5 (SCL)...
BOOT模式用于运行ESP32上的程序,而FLASH模式用于上传程序到ESP32。Strapping pins(引脚配置开关)用于配置ESP32的工作模式。通常情况下,带有内置USB/Serial的开发板会自动将这些引脚配置到正确的状态,以支持烧录或启动。然而,如果其他设备使用这些引脚,可能会导致ESP32进入错误的模式。
// initialize the library with the numbers of the interface pins LiquidCrystal_I2C lcd(0x27,16,2); // set the LCD address to 0x27 0x3F for a 16 chars and 2 line display /***/ void setup() { lcd.init(); //initialize the lcd lcd.backlight(); //open the...
There are two roles in the operation of I2C, one is “Master”, the other is “Slave”. Only one Master is allowed, and can be connected to many Slaves. Each Slave has its unique address, which is used in the communication between Master and the Slave. I2C uses two pins, one is fo...
h> #define SCREEN_WIDTH 128 // OLED display width, in pixels #define SCREEN_HEIGHT 64 // OLED display height, in pixels // Declaration for an SSD1306 display connected to I2C (SDA, SCL pins) #define OLED_RESET -1 Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_...
The standard I2C library for the Arduino is the Wire library. While this library is sufficient most of the time, there are situations when it cannot be used: the I2C pins A4/A5 (or SDA/SCL) are in use already for other purposes same I2C addresses devices are used ...