ethernet lcd display free sample

We start the code by adding the libraries:#include Wire.h // LCD #include LCD.h // LCD #include LiquidCrystal_I2C.h // LCD #include SPI.h // Ethernet #include Ethernet.h // Ethernet

The lines below are used to define the MAC address of the Ethernet shield, define a variable called ip and set it as the fallback address in case the DHCP did not respond, then initialize the Ethernet client.
byte mac[] = {0x00, 0xAA, 0xBB, 0xCC, 0xDE, 0x02}; // MAC Address of the Ethernet Shield IPAddress ip(127,0,0,1); //Fall back IP address

Then define the PINs on the I2C so we can communicate with the LCD and we initialize the LCD:#define I2C_ADDR 0x27 //Define I2C Address where the PCF8574A is

The void set up is straight forward, we start the serial monitor at 9600 bauds, tell the Arduino that we are using a 16x2 LCD and turn on the backlights on the LCD.void setup()
{

I opted to use the Ethernet.maintain() in the void loop because I want the shield to constantly look for an IP address otherwise I will have to reset the board between wall jacks.

The if statement reads as follows: if the DHCP does not respond "Ethernet.begin(mac) ==0" then assign the fall back address defined above "Ethernet.begin(mac, ip)" otherwise execute the printIPAddress() routine.void loop()
{

In this part, the first thing we do is to clear everything on the LCD scree using the lcd.clear() command, then I set the cursor on the first column of the first row using the lcd.setCursor(0,0) command and display My IP address: on the first line of the LCD and on the serial monitor. Then move the cursor to the first column of the second row on the LCD and print the IP address using the command lcd.print(Ethernet,localIP()) on the LCD and Serial.println(Ethernet.localIP()) on the serial monitor.void printIPAddress()
{

After connecting the Arduino to the computer and uploading the sketch, you should get the results you see in the pictures. If the network jack is active, the IP address will display on the LAC and on the serial monitor ( I use the serial monitor only for debugging) and if it is not active, the LCD will display 127.0.0.1.

The only issue I have with his code is if the jack is not active, it will take the 60 seconds for the lin (Ethernet.begin(mac) == 0 to return a zero value. I tried editing the file DHCP.h file in the library to reduce the time to 10 seconds but it did not work. If anyone knows how to reduce the time please feel free to comment.

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In the ethernet board, pins 10-13 are reserved. The lcd-shield is using pins 4-10 (although #10 is the backlit control, so it may be possible to go without it, just having a constant backlit) - I have the lcd - keypad shield, but at home, so I cannot check that now. - look into the lcd-library to see if you can somehow define it.

That is, it is not possible to use the backlight and the ethernet at the same time. For your other question, you just stack the LCD -keypad shield on top of your arduino board, no other connections or cables are needed.

Although it may look a bit more scary, a display without a shield, eg http://dx.com/p/16-x-2-character-lcd-display-module-with-blue-backlight-121356 is not much harder to set up and it gives you more flexibility. (although, for the display I linked to, you must be able to solder in a set of pins to connect it) Another alternative is http://dx.com/p/16-x-2-character-lcd-display-module-with-blue-backlight-121356 - the latter gives you more flexibility, but poorer readability and it is a bit more work to set up the library.