#ARDUINO TO ARDUINO I2C EXAMPLE HOW TO#

So far IвЂ™m really liking this I2C LCD backpack as it reduces the number of wires I have to use.

HereвЂ™s the LCD with the backpack in action: HereвЂ™s another example sketch from the library ( File -> Examples -> LiquidCrystal_I2C -> CustomChars: #include The library can be used with other LCD sizes as long as the controller is HD44870.Д¬ustom characters is also supported. The first parameter is the I2C address, the second is the number of columns and the last number is the number of rows.

#ARDUINO TO ARDUINO I2C EXAMPLE HOW TO#

ItвЂ™s a way to enable/disable the backlight through code which is not part of the original LiquidCrystal library.ДЄlso, hereвЂ™s how to initialize the I2C LCD object: LiquidCrystal_I2C lcd(0x27, 16, 2) Noticed before this line, we have this: lcd.backlight() In this tutorial I will show you how to connect the DS3231 to an Arduino Uno and an I2C 1602 LCD module to display the time and date. The RTC module has a battery backup to charge. The command to write a text on the LCD is the same as the original one: lcd.print('Hello, world!') The DS3231 Real Time Clock counts seconds, minutes, hours, date month, day, and year with leap-year compensation. Turn on the blacklight and print a message. Set the LCD address to 0x27 for a 16 chars and 2 line display HereвЂ™s an example sketch which is found in File -> Examples -> LiquidCrystal_I2C -> HelloWorld: Changing the I2C address is necessary if you have multiple LCDs with the same backpack.ДЇor using with an Arduino, weвЂ™ll need the LiquidCrystal_I2C library.If you were to solder A0 and A1 then the address becomes 0x24 because 0x27 вЂ“ (A2 + A1 + A0) = 0x27 вЂ“ (011) 2 = 0x24. For example, if you were to solder pad A0, the address becomes 0x26 because 0x27 вЂ“ (A2 + A1 вЂ“ A0) = 0x27 вЂ“ (001) 2 = 0x26. By default, each of these pads are connected to VDD or the positive supply. A0, A1, A2 represent three bits that would be subtracted from the address. You can, in fact, change the I2C address via the I2C Address Set pads on the board.These addresses are used in the sketch so theyвЂ™re kinda important to know. Each of this chips have their own I2C address! PCF84574T uses 0x27 while PCF8457AT uses 0x3F. Some backpacks come with PCF8574T while some come with PCF8574AT.Remove the jumper to disable the backlight. The jumper enables/disables the backlight.A trimmer is already attached to the board which acts as the contrast adjust.Now letвЂ™s look at the backpack in detail: This is how the backpack looks like attached to a LCD: The four pins on the side are the one youвЂ™ll attach to the Arduino or any I2C-supported microcontroller. The row of pins is attached to the same row of pins on any HD44870-compatible LCD. This is the I2C LCD вЂњbackpackвЂќ I was referring to:ДЄt the center of the board is the PCF8547 controller by NXP. Thankfully, by using an I2C LCD вЂњbackpackвЂќ, the pin use can be reduced to four! The least amount of pins you can use is six, excluding the power pins and the potentiometer contrast adjust ( optional) pin. The classic parallel LCD sometimes post a problem for projects that use a lot of Arduino pins.

Arduino to arduino i2c example