bjan04 Posted October 18, 2024 Posted October 18, 2024 (edited) Hi there, recently I bought an Orange Pi Zero3 with 1GB RAM. I want to connect a 20*4 character LCD display(https://www.tinytronics.nl/en/displays/lcd/lcd-display-20*4-characters-with-white-text-and-blue-backlight-with-i2c-backpack) to it. I have previously used this display with Arduino UNO, which worked great. Now I want to use it with the Orange Pi Zero3 (Ubuntu 24.04). I have no experience with the Orange Pi or single-board computers in general. I followed some tutorials, but I couldn't make it work. I did this: Wiring: I2C Backpack Orange Pi Zero3 VCC Pin 2 GND Pin 6 SCL Pin 5 SDA Pin 3 Terminal: sudo apt-get install -y python-smbus i2c-tools user@orangepizero3:~$ sudo i2cdetect -y 0 0 1 2 3 4 5 6 7 8 9 a b c d e f 00: -- -- -- -- -- -- -- -- -- -- -- -- -- 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 40: -- -- -- -- -- -- -- -- UU -- -- -- -- -- -- -- 50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 70: -- -- -- -- -- -- -- -- user@orangepizero3:~$ sudo i2cdetect -y 1 0 1 2 3 4 5 6 7 8 9 a b c d e f 00: -- -- -- -- -- -- -- -- -- -- -- -- -- 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 30: 30 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 40: -- -- -- -- -- -- -- -- UU -- -- -- -- -- -- -- 50: 50 -- -- -- 54 -- -- -- -- -- -- -- -- -- -- -- 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 70: -- -- -- -- -- -- -- -- It seems like the display cannot be found. How can I fix this? Edited October 18, 2024 by bjan04 Added wiring details 0 Quote
kris777 Posted October 24, 2024 Posted October 24, 2024 (edited) I currently have OrangePi3 LTS and I use the firmware provided by OrangePi and there you had to install wiringOP and also run during system startup: i2c0 in the file: orangepiEnv.txt That is, add the entry: overlays= i2c0 i2c1 i2c2 In Armbian firmware it is probably easier, you have to run the configuration from the terminal: armbian-config and there find the section: I2C and enable: i2c0 / system restart then proceed as you previously provided on the forum. How to connect LCD to your model ... probably like I did to my OPi 3-LTS according to this tutorial. Of course the board is different but you have to find the same pins on your OrangePiZero3 model. I managed to do it so you should too. for me it is: 3f sudo i2cdetect -y 0 0 1 2 3 4 5 6 7 8 9 a b c d e f 00: -- -- -- -- -- -- -- -- 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 3f 40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 70: -- -- -- -- -- -- -- -- I also use the lcdproc program to display the current time + install drivers for: hd44780 sudo apt-get install lcdproc lcdproc-extra-drivers Find in your system where you have the file: hd44780.so cd / find -name hd44780.so e.g. ./usr/lib/aarch64-linux-gnu/lcdproc/hd44780.so and add change the path to the file in the configuration : DriverPath=/usr/lib/aarch64-linux-gnu/lcdproc/ Example lcdproc configuration: file: LCDd.conf ## Server section with all kinds of settings for the LCDd server ## [server] DriverPath=/usr/lib/aarch64-linux-gnu/lcdproc/ Driver=hd44780 Bind=127.0.0.1 Port=13666 ReportLevel=3 User=root Foreground=no Hello="Welcome to" Hello="Armbian" GoodBye="Internet Radio" GoodBye="OrangePi3 LTS" WaitTime=5 ServerScreen=off Backlight=off Heartbeat=off TitleSpeed=4 ToggleRotateKey=Enter PrevScreenKey=Left NextScreenKey=Right ## The menu section. The menu is an internal LCDproc client. ## [menu] ## Hitachi HD44780 driver ## [HD44780] ConnectionType=i2c Device=/dev/i2c-0 Port=0x3f Backlight=no Size=16x2 DelayBus=false DelayMult=1 Keypad=no Speed=0 i2c_line_RS=0x01 i2c_line_RW=0x02 i2c_line_EN=0x04 i2c_line_BL=0x08 i2c_line_D4=0x10 i2c_line_D5=0x20 i2c_line_D6=0x40 i2c_line_D7=0x80 BacklightInvert=no # EOF in file lcdproc.conf # LCDproc client configuration file ## general options ## [lcdproc] # address of the LCDd server to connect to Server=localhost # Port of the server to connect to Port=13666 # set reporting level ReportLevel=2 # report to to syslog ? ReportToSyslog=false # run in foreground [default: false; legal: true, false] #Foreground=true # PidFile location when running as daemon [default: /var/run/lcdproc.pid] #PidFile=/var/run/lcdproc.pid # slow down initial announcement of modes (in 1/100s) #delay=2 # display name for the main menu [default: LCDproc HOST] #DisplayName=lcdproc ## screen specific configuration options ## [CPU] # Show screen Active=True OnTime=1 OffTime=2 ShowInvisible=false [Iface] # Show screen Active=True # Show stats for Interface0 Interface0=eth0 # Interface alias name to display [default: <interface name>] Alias0=LAN # Show stats for Interface1 #Interface1=eth1 #Alias1=WAN # Show stats for Interface2 #Interface2=eth2 #Alias2=MGMT # for more than 3 interfaces change MAX_INTERFACES in iface.h and rebuild # Units to display [default: byte; legal: byte, bit, packet] unit=bit # add screen with transferred traffic #transfer=TRUE [Memory] # Show screen Active=True [Load] # Show screen Active=True # Min Load Avg at which the backlight will be turned off [default: 0.05] LowLoad=0.05 # Max Load Avg at which the backlight will start blinking [default: 1.3] HighLoad=1.3 [TimeDate] # Show screen Active=True # time format [default: %H:%M:%S; legal: see strftime(3)] TimeFormat="%H:%M:%S" # date format [default: %x; legal: see strftime(3)] DateFormat="%x" [About] # Show screen Active=false [SMP-CPU] # Show screen Active=false [OldTime] # Show screen Active=false # time format [default: %H:%M:%S; legal: see strftime(3)] TimeFormat="%H:%M:%S" # date format [default: %x; legal: see strftime(3)] DateFormat="%x" # Display the title bar in two-line mode. Note that with four lines or more # the title is always shown. [default: true; legal: true, false] #ShowTitle=false [BigClock] # Show screen Active=false [Uptime] # Show screen Active=false [Battery] # Show screen Active=false [CPUGraph] # Show screen Active=false [ProcSize] # Show screen Active=false [Disk] # Show screen Active=false [MiniClock] # Show screen Active=True # time format [default: %H:%M; legal: see strftime(3)] TimeFormat="%H:%M" # EOF But this is an example configuration for OrangePi3 LTS and the Python scripts that are on the forum refer to Python 2 which is already old and in the systems there is only Python 3 and these scripts may be outdated and not work correctly Maybe there is some programmer who will convert it to Python 3 ๐ My configuration also has a fix for Polish diacritics that are displayed incorrectly on the LCD... as slashes and strange characters or question marks???? ๐ And the script supports mpd / mpc programs for internet radio #!/usr/bin/python # -*- coding: utf-8 -*- import smbus import time import subprocess from time import sleep, strftime from datetime import datetime from subprocess import * # Define some device parameters I2C_ADDR = 0x3f # I2C device address LCD_WIDTH = 16 # Maximum characters per line LCD_HEIGHT = 2 # Define some device constants LCD_CHR = 1 # Mode - Sending data LCD_CMD = 0 # Mode - Sending command LCD_LINE_1 = 0x80 # LCD RAM address for the 1st line LCD_LINE_2 = 0xC0 # LCD RAM address for the 2nd line LCD_LINE_3 = 0x94 # LCD RAM address for the 3rd line LCD_LINE_4 = 0xD4 # LCD RAM address for the 4th line LCD_BACKLIGHT = 0x08 # On #LCD_BACKLIGHT = 0x0C # Off ENABLE = 0b00000100 # Enable bit # Timing constants E_PULSE = 0.005 E_DELAY = 0.005 #Open I2C interface bus = smbus.SMBus(0) # Rev 1 Pi uses 0 (and Orange PI PC, for pins 3 and 5) #bus = smbus.SMBus(1) # Rev 2 Pi uses 1 def lcd_byte(bits, mode): # Send byte to data pins # bits = the data # mode = 1 for data # 0 for command bits_high = mode | (bits & 0xF0) | LCD_BACKLIGHT bits_low = mode | ((bits<<4) & 0xF0) | LCD_BACKLIGHT # High bits bus.write_byte(I2C_ADDR, bits_high) lcd_toggle_enable(bits_high) # Low bits bus.write_byte(I2C_ADDR, bits_low) lcd_toggle_enable(bits_low) def lcd_toggle_enable(bits): # Toggle enable time.sleep(E_DELAY) bus.write_byte(I2C_ADDR, (bits | ENABLE)) time.sleep(E_PULSE) bus.write_byte(I2C_ADDR,(bits & ~ENABLE)) time.sleep(E_DELAY) def lcd_string(message,line): # Send string to display message = message.ljust(LCD_WIDTH," ") lcd_byte(line, LCD_CMD) for i in range(LCD_WIDTH): lcd_byte(ord(message[i]),LCD_CHR) def replace_pl(chars): pl = { 'ฤ ': 'a', 'ฤ': 'c', 'ฤ': 'e', 'ล': 'l', 'ล': 'n', 'รณ': 'o', 'ล': 's', 'ลบ': 'z', 'ลผ': 'z', 'ฤ': 'A', 'ฤ': 'C', 'ฤ': 'E', 'ล': 'L', 'ล': 'N', 'ร': 'O', 'ล': 'S', 'ลน': 'Z', 'ลป': 'Z', } for f, t in pl.items(): chars = chars.replace(f,t) return chars def main(): counter = 0 while True: # Get current status and playtime process = subprocess.Popen('sudo mpc -v', shell=True, stdout=subprocess.PIPE) ekran1 = process.communicate()[0] ekran1 = replace_pl(ekran1) statusLines = ekran1.split('\n') ekran1 = statusLines[1] if ekran1 <> '': ekran1L1 = ekran1.split(' ',1)[0].strip() ekran1L2temp = ekran1.split(' ',1)[1].strip() ekran1L2 = ekran1L2temp.split(' ',1)[0].strip() process = subprocess.Popen('sudo mpc -f %name%', shell=True, stdout=subprocess.PIPE) ekran2 = process.communicate()[0] ekran2 = replace_pl(ekran2) statusLines = ekran2.split('\n') ekran2 = statusLines[0] ekran2L1 = ekran2[0:16] ekran2L2 = ekran2[16:31] process = subprocess.Popen('sudo mpc -f %artist%', shell=True, stdout=subprocess.PIPE) ekran3 = process.communicate()[0] ekran3 = replace_pl(ekran3) statusLines = ekran3.split('\n') ekran3 = statusLines[0] ekran3L1 = ekran3[0:16] ekran3L2 = ekran3[16:31] process = subprocess.Popen('sudo mpc -f %title%', shell=True, stdout=subprocess.PIPE) ekran4 = process.communicate()[0] ekran4 = replace_pl(ekran4) statusLines = ekran4.split('\n') ekran4 = statusLines[0] ekran4L1 = ekran4[0:16] ekran4L2 = ekran4[16:31] if counter == 1: if ekran1 == "": counter = 7 else: lcd_string(ekran1L1,LCD_LINE_1) lcd_string(ekran1L2,LCD_LINE_2) if counter == 7: if ekran2 == "": counter = 14 else: lcd_string(ekran2L1,LCD_LINE_1) lcd_string(ekran2L2,LCD_LINE_2) if counter == 14: if ekran3 == "": counter = 25 else: lcd_string(ekran3L1,LCD_LINE_1) lcd_string(ekran3L2,LCD_LINE_2) if counter == 25: if ekran4 == "": counter = 35 else: lcd_string(ekran4L1,LCD_LINE_1) lcd_string(ekran4L2,LCD_LINE_2) sleep(0.1) counter = counter + 1 if counter == 40: counter = 1 if __name__ == '__main__': try: main() except KeyboardInterrupt: pass finally: lcd_byte(0x00, LCD_CMD) lcd_byte(0x01, LCD_CMD) lcd_byte(0x08, LCD_CMD) Edited October 24, 2024 by kris777 0 Quote
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