Introduction: 20 X 4 LCD News Rss Feed With Adruino/python
This is an updated version of this instructable : https://www.instructables.com/id/Wiring-up-the-LCD-... All the credits goes to the original author. A few key updated features for the new project and code:
- 20 x 4 LCD with I2C.
- Python 3 instead of 2
- Working news links
- Key input option added. Please note the python program need to be open in order to use the key input.
Thanks and enjoy.
Step 1: The Adruino Code: (this Needed to Be Started Before Python)
<p>// This code is for the Arduino RSS feed project, by Fritter<br>// Read the comment lines to figure out how it works
//I reedited the code for the 20 x 4 LCD I2C display by trial and error. it eventually worked.
//A lot of patience for frustrations. Incremental changes to understant the behavior and logic or the code versus completely different approaches.
//need to use newsfeed.py, start adruino first.</p><p>// include the library code:. wire, LiquidCrystal. LiquidCrystal_I2C</p><p>#include <Wire.h>
</p><p>#include <LiquidCrystal.h></p><p>#include <LiquidCrystal_I2C.h></p><p>
int startstring = 0; // recognition of beginning of new string
int charcount = 0; // keeps track of total chars on screen
LiquidCrystal_I2C lcd2(0x27,20,4);
// LiquidCrystal_I2C lcd(i2c_addr, en, rw, rs, d4, d5, d6, d7, BACKLIGHT_PIN, POSITIVE);
int CodeIn;// used on all serial reads
<br></p><p>void setup(){</p><p>lcd2.begin();
lcd2.clear();
lcd2.backlight();
lcd2.setCursor(0,0);
lcd2.print("TOP TEN NEWS");
delay(1000);
lcd2.clear();</p><p> Serial.begin(9600);
}</p><p>void loop() {
char incomingByte = 0; // for incoming serial data
if (Serial.available() > 0) { // Check for incoming Serial Data
incomingByte = Serial.read();
if ((incomingByte == '~') && (startstring == 1)){ // Check for the closing '~' to end the printing of serial data
startstring = 0; // Set the printing to off
delay(4000); // Wait 4 seconds for reader to read
lcd2.clear(); // Wipe the screen
charcount = 0; // reset the character count to 0
lcd2.setCursor(0,0); // reset the cursor to 0,0
}
if (startstring == 1){ // check if the string has begun if first '~' has been read
if (charcount <= 129){
if (charcount == 20){
lcd2.setCursor(0,1);
}
if (charcount == 40){
lcd2.setCursor(0,2);
}
if (charcount == 60){
lcd2.setCursor(0,3);
}
if (charcount == 80){
delay(2500);
lcd2.clear(); // clear the screen
lcd2.setCursor(0,0);
charcount = 1;
}
lcd2.print(incomingByte); // Print the current byte in the serial
charcount = charcount++; // Increment the charcount by 1 yes I know it's awkward
}
}
// set cursor to 0,0
// continue printing data
// set charcount back to 1
if (incomingByte == '~'){ // Check if byte is marker ~ to start the printing
startstring = 1; // start printing
}
}
delay(10); // 10ms delay for stability
}</p>Step 2: Python 3 Code
#import library to do http requests:
import urllib.request #import pyserial Library import serial #import time library for delays import time
#import xml parser called minidom: from xml.dom.minidom import parseString
#Initialize the Serial connection in COM3 or whatever port your arduino uses at 9600 baud rate
ser = serial.Serial("\\.\COM7", 9600)
i = 1
#delay for stability while connection is achieved
time.sleep(5)
while i == 1:
newsSource = input("what News Source would you like to use? 1= Reuters; 2= BBC; 3 = Fox")
#download the rss file feel free to put your own rss url in here
if newsSource == '1':
http = 'http://feeds.reuters.com/reuters/topNews'
print ('1aaa')
elif newsSource == '2':
http = 'http://feeds.bbci.co.uk/news/world/asia/rss.xml'
print ('2bbb')
elif newsSource == '3':
http = 'http://feeds.foxnews.com/foxnews/latest'
print ('3ccc')
elif newsSource == '':
time.sleep(30)
http = 'http://feeds.foxnews.com/foxnews/latest'
file = urllib.request.urlopen(http)
#convert to string
data = file.read()
#close the file
file.close()
#parse the xml from the string
dom = parseString(data)
#retrieve the first xml tag (data) that the parser finds with name tagName change tags to get different data
xmlTag = dom.getElementsByTagName('title')[2].toxml()
# the [2] indicates the 3rd title tag it finds will be parsed, counting starts at 0
#strip off the tag (data ---> data)
xmlData=xmlTag.replace('
</p><p>','').replace('<!--[CDATA[','').replace(']]-->','')</p>
ser.write(b'~')
#split the string into individual words
nums = xmlData.split(' ')
#loop until all words in string have been printed
for num in nums:
#write 1 word
ser.write(num.encode('UTF-8'))
# write 1 space
ser.write(b' ')
# THE DELAY IS NECESSARY. It prevents overflow of the arduino buffer.
time.sleep(1)
xmlTag = dom.getElementsByTagName('title')[3].toxml()
# the [2] indicates the 3rd title tag it finds will be parsed, counting starts at 0
#strip off the tag (data ---> data)
<br><p>xmlData=xmlTag.replace('</p>
<p>','').replace('<!--[CDATA[','').replace(']]-->
','')</p>
xmlData=xmlTag.replace('
','').replace('','')
#write the marker ~ to serial
ser.write(b'~')
#split the string into individual words
nums = xmlData.split(' ')
#loop until all words in string have been printed
for num in nums:
#write 1 word
ser.write(num.encode('UTF-8'))
# write 1 space
ser.write(b' ')
# THE DELAY IS NECESSARY. It prevents overflow of the arduino buffer.
time.sleep(1)
xmlTag = dom.getElementsByTagName('title')[4].toxml()
# the [2] indicates the 3rd title tag it finds will be parsed, counting starts at 0
#strip off the tag (data ---> data)
xmlData=xmlTag.replace('','').replace('','')
#write the marker ~ to serial
ser.write(b'~')
#split the string into individual words
nums = xmlData.split(' ')
#loop until all words in string have been printed
for num in nums:
#write 1 word
ser.write(num.encode('UTF-8'))
# write 1 space
ser.write(b' ')
# THE DELAY IS NECESSARY. It prevents overflow of the arduino buffer.
time.sleep(1)
xmlTag = dom.getElementsByTagName('title')[5].toxml()
# the [2] indicates the 3rd title tag it finds will be parsed, counting starts at 0
#strip off the tag (data ---> data)
xmlData=xmlTag.replace('','').replace('','')
#write the marker ~ to serial
ser.write(b'~')
#split the string into individual words
nums = xmlData.split(' ')
#loop until all words in string have been printed
for num in nums:
#write 1 word
ser.write(num.encode('UTF-8'))
# write 1 space
ser.write(b' ')
# THE DELAY IS NECESSARY. It prevents overflow of the arduino buffer.
time.sleep(1)
xmlTag = dom.getElementsByTagName('title')[6].toxml()
# the [2] indicates the 3rd title tag it finds will be parsed, counting starts at 0
#strip off the tag (data ---> data)
xmlData=xmlTag.replace('','').replace('','')
#write the marker ~ to serial
ser.write(b'~')
#split the string into individual words
nums = xmlData.split(' ')
#loop until all words in string have been printed
for num in nums:
#write 1 word
ser.write(num.encode('UTF-8'))
# write 1 space
ser.write(b' ')
# THE DELAY IS NECESSARY. It prevents overflow of the arduino buffer.
time.sleep(1)
xmlTag = dom.getElementsByTagName('title')[7].toxml()
# the [2] indicates the 3rd title tag it finds will be parsed, counting starts at 0
#strip off the tag (data ---> data)
xmlData=xmlTag.replace('','').replace('','')
#write the marker ~ to serial
ser.write(b'~')
#split the string into individual words
nums = xmlData.split(' ')
#loop until all words in string have been printed
for num in nums:
#write 1 word
ser.write(num.encode('UTF-8'))
# write 1 space
ser.write(b' ')
# THE DELAY IS NECESSARY. It prevents overflow of the arduino buffer.
time.sleep(1)
xmlTag = dom.getElementsByTagName('title')[8].toxml()
# the [2] indicates the 3rd title tag it finds will be parsed, counting starts at 0
#strip off the tag (data ---> data)
xmlData=xmlTag.replace('
','').replace('','')
#write the marker ~ to serial
ser.write(b'~')
#split the string into individual words
nums = xmlData.split(' ')
#loop until all words in string have been printed
for num in nums:
#write 1 word
ser.write(num.encode('UTF-8'))
# write 1 space
ser.write(b' ')
# THE DELAY IS NECESSARY. It prevents overflow of the arduino buffer.
time.sleep(1)
xmlTag = dom.getElementsByTagName('title')[9].toxml()
# the [2] indicates the 3rd title tag it finds will be parsed, counting starts at 0
#strip off the tag (data ---> data)
xmlData=xmlTag.replace('','').replace('','')
#write the marker ~ to serial
ser.write(b'~')
#split the string into individual words
nums = xmlData.split(' ')
#loop until all words in string have been printed
for num in nums:
#write 1 word
ser.write(num.encode('UTF-8'))
# write 1 space
ser.write(b' ')
# THE DELAY IS NECESSARY. It prevents overflow of the arduino buffer.
time.sleep(1)
xmlTag = dom.getElementsByTagName('title')[10].toxml()
# the [2] indicates the 3rd title tag it finds will be parsed, counting starts at 0
#strip off the tag (data ---> data)
xmlData=xmlTag.replace('','').replace('','')
#write the marker ~ to serial
ser.write(b'~')
#split the string into individual words
nums = xmlData.split(' ')
#loop until all words in string have been printed
for num in nums:
#write 1 word
ser.write(num.encode('UTF-8'))
# write 1 space
ser.write(b' ')
# THE DELAY IS NECESSARY. It prevents overflow of the arduino buffer.
time.sleep(1)
xmlTag = dom.getElementsByTagName('title')[11].toxml()
# the [2] indicates the 3rd title tag it finds will be parsed, counting starts at 0
#strip off the tag (data ---> data)
xmlData=xmlTag.replace('','').replace('','')
#write the marker ~ to serial
ser.write(b'~')
#split the string into individual words
nums = xmlData.split(' ')
#loop until all words in string have been printed
for num in nums:
#write 1 word
ser.write(num.encode('UTF-8'))
# write 1 space
ser.write(b' ')
# THE DELAY IS NECESSARY. It prevents overflow of the arduino buffer.
time.sleep(1)# write ~ to close the string and tell arduino information sending is finished
ser.write(b'~')
# wait 2 seconds before rechecking RSS and resending data to Arduino
ser.write(b'~TOP TEN NEWS 1= Reuters; 2= BBC; 3 = Fox')
time.sleep(2)