Credit: https://github.com/dhylands/python_lcd/tree/master/lcd mostly to Dave Hylands for the basic api and lcd driver code.
+Project: Check it out for a full step-by-setp guide on Instructables: https://www.instructables.com/RPI-Pico-I2C-LCD-Control/
+
This is code adaptded for micropython and the Raspberry Pi PICO specifically.
Usage:
- Make sure the top address is set correctly!
Use this small program to scan for I2C devices:
+```python
import machine
sda=machine.Pin(0)
scl=machine.Pin(1)
i2c=machine.I2C(0,sda=sda, scl=scl, freq=400000)
print(i2c.scan())
+```
- Once you get an address through the console (REPL), this will be in decimal and not hex. You can convert the decimal to hex or simply put a decimal address in the setup.
in my case, the decimal addr. was 39 which converts to 0x27 in hex.
- Ensure that your SCL and SDA pins are selected properly in accordance with the Pico's pin table. These connect to the low voltage side of the translator with a 3.3V Reference from the board. The high voltage side gets a 5V reference from the VBUS pin of the Pico.
- Finally, assure the I2C_NUM_ROWS and I2C_NUM_COLS are set properly!
-Usage:
+Functions / Usage:
-Printing is simple :lcd.putstr("") This requires a string input! if you want to feed a changing value such as a temperature, it must be: lcd.putstr(str(Variable))
+These are the python commands used in a program! (They can all be found in the lcd_api.py file with definitions to their functions)
+- lcd.putstr("Text goes here!") - Send a string of chars to the display IMPORTANT: Use this for printing a variable: lcd.putstr(str(Variable)) [Turns variable into string]
+- lcd.show_cursor() / lcd.hide_cursor() - Show / Hide the cursor of the lcd (White bar)
+- lcd.blink_cursor_on() / lcd.blink_cursor_off() - Turn on / Off the blinking cursor upon printing
+- lcd.backlight_on() / lcd.backlight_off() - Turn on / Off backlight of the LCD (Controlled by a small transistor on the backpack)
+- lcd.display_on() / lcd.display_off() - Turn on / Off the display (Not backlight but the entire chip)
+- lcd.clear() - Clear all chars or anything written to the display
+- lcd.move_to(Col, Row) - Move to position based on row and col values (Y, X)
+- lcd.custom_char(Num, bytearray([HEX chars]))) - Num can be any integer 0 - 8 (Writing to CGRAM locations) merely used for numbering. The HEX chars are simply made by using this link: https://maxpromer.github.io/LCD-Character-Creator/. It will provide a string of Hex charecters which can replace the "HEX chars" in the example command.
Errors:
Feel to leave comments or questions / issues and I will try to answer / resolve them as quick as possible!
For people wondering how to use this code, Tinkernut on Youtube created a very nice guide + some more features! https://www.youtube.com/watch?v=B8Kr_3xHjqE&t
+
+
projects / RPI-PICO-I2C-LCD.git / blobdiff