![]() ![]() If you want use two Arduino, you can use a simple I/O port to communicate. ![]() Unshielded cable typically has much less capacitance, but should only be used within an otherwise shielded enclosure. So the maximum bus length of an I2C link is about 1 meter at 100 Kbaud, or 10 meters at 10 Kbaud. What is the maximum distance of the I2C bus? It is not possible to change the hardware I2C pins. Write() Writes data from a slave device in response to a request from a master, or queues bytes for transmission from a master to slave device (in-between calls to beginTransmission() and endTransmission()). Note: While communicating with devices using I2C communication protocol, pull-up resistors should be used. The Arduino Uno board has only one I2C module, but it provides these SDA and SCL line at two different locations. Using I2C, you can transmit data at rates 100 kbit/s (clock 100 kHz – Standard Mode), 400 kbit/s (clock 400 kHz – Fast Mode), 1 Mbit/s (clock 1 MHz – Fast Mode Plus) and 3.4 Mbit/s (clock 3.4 MHz – High Speed Mode). The TWI can be used with I☬ compatible devices, such as a Real-Time Clock (RTC), memories, and sensors. The TWI peripheral provides an interface to components on a unique two-wire bus, consisting of one clock line and one data line. The Two-Wire Interface (TWI) is similar to the I2C interface with a few differences. Save the changes made and close the text editor. ![]() Locate the line #define BUFFER_LENGTH 32 and change the number 32 to the desired value.Modify the buffer size of the Wire library \Arduino\hardware\arduino\avr\libraries\Wire\src\Wire. ![]()
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