Some beginner-friendly Arduino Uno projects you can get started with include an ultrasonic piano, ... and their A4 and A5 pins both double as SDA and SCL pins for I2C/TWI communication.

We powered the sensor stick using the 5 volts out available on the Arduino Uno. I2C also requires pull-up resistors on the data (SDA) and clock (SCL) buses.

ARDUINO UNO: VCC: 5V: SCL: SCL/A5: SDA: SDA/A4: GND: GND: As pointed out before, the communication bus consists of a serial clock line and a serial data line. The clock is generated by the bus master ...

Arduino Uno R4 WiFi comes with built-in Wi-Fi and Bluetooth capabilities, along with additional pins and a new, faster processor. Tech. ... and additional SDA and SCL pins.

Two 10k pull up resistor s are at the SDA and SCL pins. This is due to the reason that DS1307 communicates through I2C interface. SDA – Arduino pin A4; SCL ... I uploaded the below coding to my ...