This tutorial is all about IIC (I2C) communication on Raspberry Pi by using JAVA and for that, I have used Pi4J library. To demonstrate this in the tutorial I have used MCP23017 Port expander IC with Raspberry Pi. MCp23017 is a 16 Bit input/output Port Expander ICcomes with I2C Interface. To interact with the IC suing IIC (I2C) port here we have used Pi4J and JAVA.
MCP23017 Features:
16-bit input/output port expander with interrupt output
Cascadable for up to 8 devices on one bus
25mA sink/source capability per I/O
Supports 100kHz, 400kHz, and 1.7MHz I2C™Compatible compatible modes
MCP23017 Details : http://bit.ly/2koAFzc
Links :
Java Application on Pi Playlist: http://bit.ly/2eB1O2K
Github Repository: http://bit.ly/2jVML2Y
Schematic: http://bit.ly/2kow4Nr
Pi4J GPIO Numbering: http://bit.ly/2ja20av
Download Pi4J Library: http://bit.ly/2j32blF
Code: http://bit.ly/2jVML2Y
import java.io.IOException;
import com.pi4j.io.i2c.I2CBus;
import com.pi4j.io.i2c.I2CDevice;
import com.pi4j.io.i2c.I2CFactory;
import com.pi4j.io.i2c.I2CFactory.UnsupportedBusNumberException;
public class Main {
public static final int MCP23017_ADDRESS = 0x20;
private static final int IODIRA_REGISTER = 0x00; //IODIRA Register. Responsible for input or output
private static final int IODIRB_REGISTER = 0x01; //IODIRB Register. Responsible for input or output
private static final int GPIOA_REGISTER = 0x12; //GPIOA Register. Write or read value
private static final int GPIOB_REGISTER = 0x13; //GPIOB Register. Write or read value
//private static final int GPPUA_REGISTER = 0x0C; //PORT A Pull-up value. If set configures the internal pull-ups
private static final int GPPUB_REGISTER = 0x0D; ///PORT B Pull-up value. If set configures the internal pull-ups
public static void main(String args[]) throws InterruptedException, UnsupportedBusNumberException, IOException {
System.out.println("MCP23017 Example");
I2CBus i2c = I2CFactory.getInstance(I2CBus.BUS_1);
I2CDevice device = i2c.getDevice(MCP23017_ADDRESS);
device.write(IODIRA_REGISTER, (byte) 0x00);
device.write(IODIRB_REGISTER, (byte) 0xFF);
device.write(GPPUB_REGISTER, (byte) 0xFF);
while(true){
System.out.println(device.read(GPIOB_REGISTER));
Thread.sleep(2000);
device.write(GPIOA_REGISTER, (byte) 0x00);
Thread.sleep(2000);
device.write(GPIOA_REGISTER, (byte) 0xFF);
}
}
}
Buy Sensor : http://amzn.to/2koHz7x (India)
Buy Raspberry Pi : http://amzn.to/2jlIOUH (India)
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