i2c_lcd_display
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- | LCDs are a great way to display simple information (like an IP address) without going to the expense of a full LCD panel, or connecting a monitor. | + | LCDs are a great way to display simple information (like an IP address) without going to the expense of a full LCD panel, or connecting a monitor. |
+ | \\ | ||
+ | Another way to connect an LCD is to use the I2C interface. This only requires a total of 4 wires, two for the data, 2 for power. You can buy LCDs with built in I2C adaptors, I got mine from eBay, I can't really link it because the links to eBay items seem to die fairly quicly.\\ | ||
+ | \\ | ||
+ | If you do a search for something like this: | ||
+ | Yellow Green Serial IIC/I2C/TWI 2004 20X4 Character LCD Module For Arduino | ||
+ | \\ | ||
+ | Then you should find what you are looking for.\\ | ||
+ | \\ | ||
+ | Here is the description for what I purchased (obviously you can ignore the Arduino references)\\ | ||
+ | \\ | ||
+ | |||
+ | Yellow Green Serial IIC/I2C/TWI 2004 20X4 Character LCD Module For Arduino | ||
+ | \\ | ||
+ | Dedicated IIC control for Arduino, it only takes two IO | ||
+ | |||
+ | Adjustable contrast, the backlight control to provide library | ||
+ | |||
+ | High quality LCD screen, Yellow Green, clear display | ||
+ | |||
+ | IIC bus control, it only takes two IO ports | ||
+ | |||
+ | Backlight control, you can control via a jumper, you can also program control | ||
+ | |||
+ | Adjustable display contrast | ||
+ | |||
+ | 5V power supply, the device address 0x27 | ||
+ | |||
+ | Compatible to Arduino | ||
+ | \\ | ||
+ | There are many of these available on eBay in 2016, and they average around £3.50-£4.00\\ | ||
+ | \\ | ||
+ | Here is one connected to a Pi Zero (1.3)\\ | ||
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+ | {{: | ||
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+ | The most tricky part of getting any LCD to run is finding a driver/ | ||
+ | \\ | ||
+ | This guide assumes that you have installed Raspbian (or equivalent) and updated everything with the following commands: | ||
+ | \\ | ||
+ | sudo apt-get update | ||
+ | sudo apt-get upgrade | ||
+ | \\ | ||
+ | On the LCD the four connections will be labelled something like: | ||
+ | \\ | ||
+ | LCD R-Pi | ||
+ | |||
+ | GND (Ov) Pin 6 | ||
+ | VCC (5v) Pin 2 | ||
+ | SDA Pin 3 (GPIO2) | ||
+ | SCL Pin 5 (GPIO3) | ||
+ | \\ | ||
+ | You need to ensure that the I2C pins are active: | ||
+ | \\ | ||
+ | sudo raspi-config | ||
+ | Advanced Options | ||
+ | I2C | ||
+ | |||
+ | Where you see the message - Would you like the ARM I2C interface to be enabled? | ||
+ | |||
+ | Select Yes, then exit this menu system | ||
+ | |||
+ | Reboot for the changes to take effect | ||
+ | \\ | ||
+ | Once the OS is installed and the LCD is connected, the libraries can be installed: | ||
+ | \\ | ||
+ | Ensure you are in your home folder (probably /home/pi)\\ | ||
+ | \\ | ||
+ | From the command line: | ||
+ | \\ | ||
+ | git clone https:// | ||
+ | |||
+ | cd lcd | ||
+ | |||
+ | sudo sh install.sh (RPi will auto reboot) | ||
+ | \\ | ||
+ | Once the Pi has rebooted: | ||
+ | \\ | ||
+ | Navigate to your home folder (probably /home/pi) | ||
+ | cd lcd | ||
+ | edit lcddriver.py to ensure the ADDRESS = 0x27 is the correct address (some are 0x20) | ||
+ | \\ | ||
+ | I found this guide by doing this YouTube search: | ||
+ | \\ | ||
+ | |||
+ | Raspberry Pi - Mini LCD Display Tutorial by TheRaspberryPiGuy | ||
+ | \\ | ||
+ | To start the demo LCD code: | ||
+ | \\ | ||
+ | sudo python lcd_lcd.py | ||
+ | \\ | ||
+ | You should now have some text on the LCD\\ | ||
+ | \\ |
i2c_lcd_display.txt · Last modified: 2023/03/09 22:35 by 127.0.0.1