{ "ok": true, "data": { "title": "D-0006", "rev_id": 10821, "updated_at": "2021-08-27T10:50:37+00:00", "chunk_count": 17, "chunks": [ { "title": "D-0006", "rev_id": 10821, "heading_path": "", "chunk_index": 0, "content": "# D-0006", "char_count": 8, "token_estimate": 2 }, { "title": "D-0006", "rev_id": 10821, "heading_path": "PCF8574T LCD Driver Board", "chunk_index": 1, "content": "[right \\|500px](File:D_0006_1.jpg \"wikilink\")", "char_count": 45, "token_estimate": 12 }, { "title": "D-0006", "rev_id": 10821, "heading_path": "Description", "chunk_index": 2, "content": "The PCF8574T IO Expansion Board is used as remote 8-bit I\/O expander for I2C-bus.\nUp to 8 PCF8574T IO Expansion Board can be connected to the I2C-bus, providing up to 64 I\/O ports.\nThe PCF8574T IO Expansion Board features allowing the use of multi module connected to the I2C bus at the same time by connecting the pinheader and connector.\nThere is a small potentiometer onboard, which can adjust the backlight of LCD1602 or LCD2004, and a jumper cap to control the switch of the LED light.", "char_count": 490, "token_estimate": 123 }, { "title": "D-0006", "rev_id": 10821, "heading_path": "Features", "chunk_index": 3, "content": "- PCF8574T Chip\n- I2C interface\n- 8-bit parallel port\n- Potentiometer Backlight control\n- LED jumper switch\n- Default I2C address: 0x27", "char_count": 147, "token_estimate": 37 }, { "title": "D-0006", "rev_id": 10821, "heading_path": "Gallery", "chunk_index": 4, "content": "| | | |\n|--------------------------------------------------------------------------------|--------------------------------------------------------------------------------|--------------------------------------------------------------------------------|\n|
\n \"D_0006_1.jpg\"\n
D_0006_1.jpg<\/figcaption>\n <\/figure> |
\n \"D_0006_2.jpg\"\n
D_0006_2.jpg<\/figcaption>", "char_count": 1030, "token_estimate": 258 }, { "title": "D-0006", "rev_id": 10821, "heading_path": "Gallery", "chunk_index": 5, "content": "<\/figure> |
\n \"D_0006_4.jpg\"\n
D_0006_4.jpg<\/figcaption>\n <\/figure> |", "char_count": 797, "token_estimate": 200 }, { "title": "D-0006", "rev_id": 10821, "heading_path": "Gallery > Dimenssion", "chunk_index": 6, "content": "\"D_0006_6.jpg\"", "char_count": 78, "token_estimate": 20 }, { "title": "D-0006", "rev_id": 10821, "heading_path": "Package Includes", "chunk_index": 7, "content": "- 1 x PCF8574T LCD Driver Board", "char_count": 33, "token_estimate": 9 }, { "title": "D-0006", "rev_id": 10821, "heading_path": "Reference", "chunk_index": 8, "content": "- PCF8574T Chip Datasheet: [File:PCF8574T Datasheet.pdf](File:PCF8574T_Datasheet.pdf \"wikilink\")\n- WiringPi: \\[ \\]\n- telecnatron:\\[ \\]\n- Circuitbasics:\\[ \\]", "char_count": 410, "token_estimate": 103 }, { "title": "D-0006", "rev_id": 10821, "heading_path": "Demo Code For Handle PCF8574T", "chunk_index": 9, "content": "- Download and reinstall wiringPi liberary\n\n\n\n sudo apt -y purge wiringpi\n hash -r\n cd \/tmp\n wget https:\/\/project-downloads.drogon.net\/wiringpi-latest.deb\n sudo dpkg -i wiringpi-latest.deb\n\n- C++ language\n\n\n\n #include \n #include \n #include \n\n #include \n #include \n\n using namespace std;\n int main (int argc, char *argv[]){\n printf(\"Raspberry Pi initializing...\\n\");\n\n wiringPiSetup();\n pcf8574Setup(100, 0x38);\n\n for (int i = 0; i < 8; ++i){\n pinMode(100 + i, OUTPUT);\n }\n\n int b=0;\n while( 1==1 ){\n printf(\"LOOP %u\\n\", b);\n for (int i = 0; i < 8; ++i){\n digitalWrite(100 + i, i==b ? 0 : 1);\n }\n b++;\n if( b >= 8 ) b=0;\n delay(1000);\n\n }\n\n delay(1000);\n digitalWrite(100 + 0, 0);\n\n delay(1000);\n digitalWrite(100 + 0, 1);\n\n return 0;\n }\n\n- Compile and run it.\n\n\n\n g++ pcf8574.cpp -o pcf8574 -lwiringPi -std=c++11\n .\/pcf8574", "char_count": 1189, "token_estimate": 298 }, { "title": "D-0006", "rev_id": 10821, "heading_path": "Demo Code For Handle PCF8574T > Python Demo Code", "chunk_index": 10, "content": "- Copy following code and save it as: I2C_LCD_driver.py\n\n\n\n# -*- coding: utf-8 -*-\n\n# Original code found at:\n\n# https:\/\/gist.github.com\/DenisFromHR\/cc863375a6e19dce359d\n\n\"\"\"\n Compiled, mashed and generally mutilated 2014-2015 by Denis Pleic\n Made available under GNU GENERAL PUBLIC LICENSE\n\n# Modified Python I2C library for Raspberry Pi\n\n# as found on http:\/\/www.recantha.co.uk\/blog\/?p=4849\n\n# Joined existing 'i2c_lib.py' and 'lcddriver.py' into a single library\n\n# added bits and pieces from various sources\n\n# By DenisFromHR (Denis Pleic)\n\n# 2015-02-10, ver 0.1\n\n\"\"\"\n\n# i2c bus (0 -- original Pi, 1 -- Rev 2 Pi)\n\n# I2CBUS = 0\n\nI2CBUS = 1\n\n# LCD Address\n\n#ADDRESS = 0x3f\n ADDRESS = 0x27\n\nimport smbus\n from time import sleep\n\nclass i2c_device:\n def (self, addr, port=I2CBUS):\n self.addr = addr\n self.bus = smbus.SMBus(port)\n\n# Write a single command\n\ndef write_cmd(self, cmd):\n self.bus.write_byte(self.addr, cmd)\n sleep(0.0001)\n\n# Write a command and argument\n\ndef write_cmd_arg(self, cmd, data):\n self.bus.write_byte_data(self.addr, cmd, data)\n sleep(0.0001)\n\n# Write a block of data", "char_count": 1171, "token_estimate": 293 }, { "title": "D-0006", "rev_id": 10821, "heading_path": "Demo Code For Handle PCF8574T > Python Demo Code", "chunk_index": 11, "content": "def write_block_data(self, cmd, data):\n self.bus.write_block_data(self.addr, cmd, data)\n sleep(0.0001)\n\n# Read a single byte\n\ndef read(self):\n return self.bus.read_byte(self.addr)\n\n# Read\n\ndef read_data(self, cmd):\n return self.bus.read_byte_data(self.addr, cmd)\n\n# Read a block of data\n\ndef read_block_data(self, cmd):\n return self.bus.read_block_data(self.addr, cmd)\n\n# commands\n\nLCD_CLEARDISPLAY = 0x01\n LCD_RETURNHOME = 0x02\n LCD_ENTRYMODESET = 0x04\n LCD_DISPLAYCONTROL = 0x08\n LCD_CURSORSHIFT = 0x10\n LCD_FUNCTIONSET = 0x20\n LCD_SETCGRAMADDR = 0x40\n LCD_SETDDRAMADDR = 0x80\n\n# flags for display entry mode\n\nLCD_ENTRYRIGHT = 0x00\n LCD_ENTRYLEFT = 0x02\n LCD_ENTRYSHIFTINCREMENT = 0x01\n LCD_ENTRYSHIFTDECREMENT = 0x00\n\n# flags for display on\/off control\n\nLCD_DISPLAYON = 0x04\n LCD_DISPLAYOFF = 0x00\n LCD_CURSORON = 0x02\n LCD_CURSOROFF = 0x00\n LCD_BLINKON = 0x01\n LCD_BLINKOFF = 0x00\n\n# flags for display\/cursor shift\n\nLCD_DISPLAYMOVE = 0x08\n LCD_CURSORMOVE = 0x00\n LCD_MOVERIGHT = 0x04\n LCD_MOVELEFT = 0x00\n\n# flags for function set", "char_count": 1133, "token_estimate": 284 }, { "title": "D-0006", "rev_id": 10821, "heading_path": "Demo Code For Handle PCF8574T > Python Demo Code", "chunk_index": 12, "content": "LCD_8BITMODE = 0x10\n LCD_4BITMODE = 0x00\n LCD_2LINE = 0x08\n LCD_1LINE = 0x00\n LCD_5x10DOTS = 0x04\n LCD_5x8DOTS = 0x00\n\n# flags for backlight control\n\nLCD_BACKLIGHT = 0x08\n LCD_NOBACKLIGHT = 0x00\n\nEn = 0b00000100 # Enable bit\n\nRw = 0b00000010 # Read\/Write bit\n\nRs = 0b00000001 # Register select bit\n\nclass lcd:\n #initializes objects and lcd\n def (self):\n self.lcd_device = i2c_device(ADDRESS)\n\nself.lcd_write(0x03)\n self.lcd_write(0x03)\n self.lcd_write(0x03)\n self.lcd_write(0x02)\n\nself.lcd_write(LCD_FUNCTIONSET | LCD_2LINE | LCD_5x8DOTS | LCD_4BITMODE)\n self.lcd_write(LCD_DISPLAYCONTROL | LCD_DISPLAYON)\n self.lcd_write(LCD_CLEARDISPLAY)\n self.lcd_write(LCD_ENTRYMODESET | LCD_ENTRYLEFT)\n sleep(0.2)\n\n# clocks EN to latch command\n\ndef lcd_strobe(self, data):\n self.lcd_device.write_cmd(data | En | LCD_BACKLIGHT)\n sleep(.0005)\n self.lcd_device.write_cmd(((data & ~En) | LCD_BACKLIGHT))\n sleep(.0001)\n\ndef lcd_write_four_bits(self, data):\n self.lcd_device.write_cmd(data | LCD_BACKLIGHT)\n self.lcd_strobe(data)\n\n# write a command to lcd", "char_count": 1193, "token_estimate": 299 }, { "title": "D-0006", "rev_id": 10821, "heading_path": "Demo Code For Handle PCF8574T > Python Demo Code", "chunk_index": 13, "content": "def lcd_write(self, cmd, mode=0):\n self.lcd_write_four_bits(mode | (cmd & 0xF0))\n self.lcd_write_four_bits(mode | ((cmd << 4) & 0xF0))\n\n# write a character to lcd (or character rom) 0x09: backlight | RS=DR<\n\n# works!\n\ndef lcd_write_char(self, charvalue, mode=1):\n self.lcd_write_four_bits(mode | (charvalue & 0xF0))\n self.lcd_write_four_bits(mode | ((charvalue << 4) & 0xF0))\n\n# put string function with optional char positioning\n\ndef lcd_display_string(self, string, line=1, pos=0):\n if line == 1:\n pos_new = pos\n elif line == 2:\n pos_new = 0x40 + pos\n elif line == 3:\n pos_new = 0x14 + pos\n elif line == 4:\n pos_new = 0x54 + pos\n\nself.lcd_write(0x80 + pos_new)\n\nfor char in string:\n self.lcd_write(ord(char), Rs)\n\n# clear lcd and set to home\n\ndef lcd_clear(self):\n self.lcd_write(LCD_CLEARDISPLAY)\n self.lcd_write(LCD_RETURNHOME)\n\n# define backlight on\/off (lcd.backlight(1); off= lcd.backlight(0)\n\ndef backlight(self, state): # for state, 1 = on, 0 = off", "char_count": 1084, "token_estimate": 271 }, { "title": "D-0006", "rev_id": 10821, "heading_path": "Demo Code For Handle PCF8574T > Python Demo Code", "chunk_index": 14, "content": "if state == 1:\n self.lcd_device.write_cmd(LCD_BACKLIGHT)\n elif state == 0:\n self.lcd_device.write_cmd(LCD_NOBACKLIGHT)\n\n# add custom characters (0 - 7)\n\ndef lcd_load_custom_chars(self, fontdata):\n self.lcd_write(0x40);\n for char in fontdata:\n for line in char:\n self.lcd_write_char(line)\n\n- Create a file named: lcd1602.py and paste following code:\n\n\n\nimport I2C_LCD_driver\n from time import *\n\nmylcd = I2C_LCD_driver.lcd()\n # There are 16 character that you can put on the screen and 2 lines avaliable.\n\nmylcd.lcd_display_string(\"00000000000000000\", 1, 0)\n mylcd.lcd_display_string(\"00000000000000000\", 2, 0)\n\n- Run it.\n\n\n\npython lcd1602.py", "char_count": 748, "token_estimate": 187 }, { "title": "D-0006", "rev_id": 10821, "heading_path": "Application Scenario", "chunk_index": 15, "content": "- Control-Any-Devices-Using-Raspberry-PI-and-PCF8574: \\[ \\]\n- I2C-1602-LCD: [1](https:\/\/github.com\/VeggieVampire\/I2C-1602-LCD)", "char_count": 217, "token_estimate": 55 }, { "title": "D-0006", "rev_id": 10821, "heading_path": "Keywords", "chunk_index": 16, "content": "- PCF8574T, LCD1602, driver board, LCD driver board", "char_count": 53, "token_estimate": 14 } ] } }