odroid-h3:application_note:i2c_20x4_lcd

I2C 20x4 LCD

This examples have written based on under the Ubuntu 22.04 and Linux kernel 5.15.0-46-generic

Download fritzing
- fritzing parts ☞ h3_20x4lcd_i2c.fzz
- LCM1602 part ☞ lcm1602_iic.fzpz
- ODROID-H3 part ☞ odroid-h3.fzpz

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 1

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

sudo i2cdetect -y -r 2
target
odroid@h2:~$ sudo i2cdetect -y -r 1
     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: -- -- -- -- -- -- -- --  
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
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.

sudo python3 hello_world.py I2CBUS
sudo python3 hello_world.py 1

Or

sudo python3 hello_world.py 2

  • odroid-h3/application_note/i2c_20x4_lcd.txt
  • Last modified: 2022/10/12 14:39
  • by luke.go