RED HAT Comments - Answer Overflow

RED HAT

•Created by Boss lady on 8/13/2024 in #⌨-firmware-and-baremetal

LCD Screen Remains Blank on BeagleBone Black with HC-SR04 Ultrasonic Sensor

@Boss lady re-check all your connections to ensure the RS, E, and data pins (D4-D7) are correctly connected to the BeagleBone Black GPIO pins. Make sure that the contrast pin (often labeled V0) is correctly set. Sometimes the contrast needs to be adjusted to see anything on the LCD, also ensure the LCD initialization sequence is correct. Sometimes small mistakes in initialization can cause the display to remain blank, try testing the LCD Use to test print hello world on LCD screen

import Adafruit_BBIO.GPIO as GPIO
from RPLCD.gpio import CharLCD
import time

LCD_RS = "P8_11"
LCD_E = "P8_12"
LCD_D4 = "P8_13"
LCD_D5 = "P8_14"
LCD_D6 = "P8_15"
LCD_D7 = "P8_16"

lcd = CharLCD(pin_rs=LCD_RS, pin_e=LCD_E, pins_data=[LCD_D4, LCD_D5, LCD_D6, LCD_D7], numbering_mode=GPIO.BOARD)

lcd.clear()
lcd.write_string("Hello, World!")
time.sleep(5)
lcd.clear()

import Adafruit_BBIO.GPIO as GPIO
from RPLCD.gpio import CharLCD
import time

LCD_RS = "P8_11"
LCD_E = "P8_12"
LCD_D4 = "P8_13"
LCD_D5 = "P8_14"
LCD_D6 = "P8_15"
LCD_D7 = "P8_16"

lcd = CharLCD(pin_rs=LCD_RS, pin_e=LCD_E, pins_data=[LCD_D4, LCD_D5, LCD_D6, LCD_D7], numbering_mode=GPIO.BOARD)

lcd.clear()
lcd.write_string("Hello, World!")
time.sleep(5)
lcd.clear()

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