I2C 20x4 LCD

Wiring

Download fritzing
- ODROID-H2 part ☞ odroid-h2.fzpz
- LCM1602 part ☞ lcm1602_iic.fzpz
- fritzing parts ☞ 20x4lcd_i2c.fzz

Connection Check

If you have done the wiring well, you can see the device as the following commands.

sudo apt install i2c-tools

When you have wired the I/O expander to Pin #18(SCL) and #20(SDA).

sudo i2cdetect -y -r 5

When you have wired the I/O expander to Pin #13(SCL) and #15(SDA).

sudo i2cdetect -y -r 6

Kernel 4.18 must access the I2C channel #6 via /dev/i2c-2.

odroid@h2:~$ sudo i2cdetect -y -r 2
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- 27 -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- --

Install & build python packages

sudo apt install git python3-dev libi2c-dev python3-smbus

If you got this error on your Ubuntu.

E: Unable to locate package python3-smbus

Build the python3-smbus package.

git clone https://github.com/tkurbad/python3-smbus.git
cd python3-smbus
python3 setup.py build
python3 setup.py install

Get source code

git clone https://github.com/hardkernel/i2c_20x4_lcd.git

Edit lcddriver.py if you need to change the host bus address and/or device address.

Run the example

sudo python3 hello_world.py I2CBUS

sudo python3 hello_world.py 5

Or

sudo python3 hello_world.py 6

Thanks to djjproject

source : https://github.com/djjproject/odroidh2_i2c_lcd

Install requirement packages

sudo apt install git python3-dev libi2c-dev python3-smbus
sudo apt install python3-psutil lm-sensor hdparm

Get the source code

git clone https://github.com/djjproject/odroidh2_i2c_lcd.git

Change I2C bus and Ethernet port

You may need to change to the I2C bus and Ethernet port name you are using.

Ethernet : https://github.com/djjproject/odroidh2_i2c_lcd/blob/master/hello_world.py#L8
I2C bus : https://github.com/djjproject/odroidh2_i2c_lcd/blob/master/lcddriver.py#L9

Run

sudo python3 hello_world.py