This is the project use to measure the distance by usign sr-04 ultrasonic sensor with SBC raspberrypi.

the pin mapping is Board.

The wiring for the LCD is as follows: 1 : GND 2 : 5V 3 : Contrast (0-5V)* 4 : RS (Register Select) 5 : R/W (Read Write) - GROUND THIS PIN 6 : Enable or Strobe 7 : Data Bit 0 - NOT USED 8 : Data Bit 1 - NOT USED 9 : Data Bit 2 - NOT USED 10: Data Bit 3 - NOT USED 11: Data Bit 4 12: Data Bit 5 13: Data Bit 6 14: Data Bit 7 15: LCD Backlight +5V** 16: LCD Backlight GND

Define GPIO to LCD mapping with raspberry. LCD_RS = 7, LCD_E = 1, LCD_D4 = 1, LCD_D5 = 15, LCD_D6 = 16, LCD_D7 = 18