Arduino mirror image, orientation problem with display MAX7219

How to use MAX7219 LED Matrix with Arduino

Good Libraries to use with the MAX7219 LED are:
https://github.com/MajicDesigns/MD_MAX72XX LED
https://github.com/MajicDesigns/MD_Parola Scrolling

You’ll find lot’s of examples after you install the libraries in the Arduino IDE.

Arduino mirror image, orientation problem with display MAX7219

How to solve problem with the LED matrix MAX7219 and the MD_MAX72xx.h Library

If you have problems with mirroring and/or orientation find following line and try following solutions, Choose one:

#define HARDWARE_TYPE MD_MAX72XX::FC16_HW




#define HARDWARE_TYPE MD_MAX72XX::PAROLA_HW




#define HARDWARE_TYPE MD_MAX72XX::GENERIC_HW




#define HARDWARE_TYPE MD_MAX72XX::ICSTATION_HW

Raspberry pi & waveshare 2.7 e-ink Display & python

Start with a headless raspberry, no need to connect monitor, keyboard: https://raspberrypi.stackexchange.com/questions/10251/prepare-sd-card-for-wifi-on-headless-pi

Here’s some example python code for drawing text horizontal on the waveshare e-ink display. You’ll find also a example where to find the length of text where to break lines. This examples reads some small text from a web site and looks up a rss feed for the weather.

Install the fonts https://www.raspberrypi.org/forums/viewtopic.php?t=133772

sudo apt-get install ttf-mscorefonts-installer

Install libraries https://www.waveshare.com/wiki/Pioneer600#Libraries_Installation_for_RPi

sudo apt-get install git-core
git clone git://git.drogon.net/wiringPi
cd wiringPi
 ./build
cd
wget http://www.airspayce.com/mikem/bcm2835/bcm2835-1.59.tar.gz
tar zxvf bcm2835-1.59.tar.gz
cd bcm2835-1.59
./configure
make
sudo make check
sudo make install
cd
sudo apt-get install python-dev
sudo python setup.py install
sudo apt-get install RPi.GPIO
sudo apt-get install python-smbus
sudo apt-get install python-serial
sudo apt-get install python3-pip
sudo apt-get install python-pip
pip3 install RPi.GPIO
pip install spidev
sudo apt-get install python-imaging
sudo apt-get install python-pil
pip install feedparser

(Before running the API codes we provided, you should start up the corresponding core drivers of the interfaces. In the ready-to-use system image file, both I2C and SPI are set to Enable by default, but the serial port is still in the terminal debugging function mode.)

  1. Enable the I2C function. Run the following command to configure your Raspberry Pi board:
     sudo raspi-config

    Select Advanced Options -> I2C -> yes, to start up the I2C core driver. Then you also need to modify the configuration file. Run the following command to open the configuration file:

    sudo nano /etc/modules

    Add the following two lines to the configuration file

    i2c-bcm2708
    i2c-dev
    Press the keys Ctrl+X to exit, and input Y to save the settings. Then, reboot the module to make the settings take effect.
  2. Enable the serial function. The serial port of RPi is set to serial terminal debugging function mode by default. If you want the serial port services as a common IO, you should modify the settings on the RPi. When the terminal debugging function is disabled, you cannot access RPi board via the serial port any more. If you want to control the RPi, you may need to enable the debugging function of the serial port again.
    sudo raspi-config

    Select Advanced Options -> Serial. Select the option no can disable the serial debugging function. And then, the serial port can be used for serial communication. And select the option yes can enable the serial debugging function. You should reboot the module to make the settings take effect.

Note: the serial port on Raspberry Pi 3 Model B is unusable, because Pin 14 and Pin 15 is connected to the on-board Bluetooth model.
  1. Start up the spi function, run the following command:
    sudo raspi-config

    Select Advanced Options -> I2C -> yes, to start up I2C core driver.


Code


# coding: utf8
##
 #  width 176
 #  height 264
 ##



import epd2in7
from PIL import Image
from PIL import ImageFont
from PIL import ImageDraw
import time
import urllib2
import feedparser
import datetime

def getLengthText(myTextInput, myFont, pixels):
    #font = ImageFont.truetype('/usr/share/fonts/truetype/freefont/msttcorefonts/comic.ttf', 28)
    #font = ImageFont.truetype("arial", 20)
    myText = myTextInput
    mlen = 0
    mlen = len(myText)
    w, h = myFont.getsize(myText)
    while pixels < w:
        myText = myText[0:mlen-2]
        mlen = len(myText)
        w, h = myFont.getsize(myText)
    return mlen

def addText(myImage,myText, myFont, xx,yy):
    #font = ImageFont.truetype('/usr/share/fonts/truetype/freefont/msttcorefonts/comic.ttf', 28)
    #font = ImageFont.truetype("arial", 20)
    w, h = myFont.getsize(myText)
    mask = Image.new('1', (w, h), 255)
    draw2 = ImageDraw.Draw(mask)
    draw2.text((0, 0), myText, font = myFont, fill = 0)
    mask = mask.rotate(90, expand=True)
    myImage.paste(mask, (xx,epd2in7.EPD_HEIGHT - w - yy ))

def main():
    epd = epd2in7.EPD()
    epd.init()

    image = Image.new('1', (epd2in7.EPD_WIDTH, epd2in7.EPD_HEIGHT), 255)    # 255: clear the image with white
    draw = ImageDraw.Draw(image)
    
    font = ImageFont.truetype("arial", 18)
    font2 = ImageFont.truetype("comic", 24)
    font3 = ImageFont.truetype("arial", 28)

    # get text from a feed
    #d = feedparser.parse('http://www.reddit.com/r/news/.rss')
    d = feedparser.parse('https://www.br.de/wetter/action/feeds/bayernwetter.do')
    dnr = 0
    dlen = len(d['entries'])
    #test
    oberbayern = 0
    for n in range(dlen):
        actentry = d['entries'][n]['title'].encode('utf-8').strip()
        print str(n) + " " + actentry[0:8]
        if actentry[0:8] == "Oberbaye":
            oberbayern = n
        #münchen
        if actentry[0:8] == "München":
            muenchen = n
    
    
    print d['entries'][oberbayern]['title'].encode('utf-8').strip()
    print d['entries'][muenchen]['title'].encode('utf-8').strip()
    nb = d['entries'][oberbayern]['title'].strip()
    
    # get text from a website
    ttext = "err"
    try:
            #response = urllib2.urlopen('http://4johannes.de/weather/lowest.txt')
            response = urllib2.urlopen('http://eiseler.com/perltest/tempmysqlcoldestblank.pl')
            ttext = response.read().strip()
            print(ttext)
    except:
            print("fehler2")
            ttext = "err2"

    # add to display

    # first Line
    grad = u'°'
    #entlang umgerechnet oben 1,1 nach 1,264/2
    draw.line((0, 264, 0, 0), fill = 0)
    draw.line((1, 264, 1, 0), fill = 0)
    addText(image, datetime.datetime.now().strftime("%H:%M %d.%m."), font3, 5, 6)
    addText(image, ttext + grad, font3, 5, 182)
    # horizontal unter der schrift:
    draw.line((38, 264, 38, 0), fill = 0)
    draw.line((39, 264, 39, 0), fill = 0)
    # senkrechte Linien, wenn quer gesehen
    draw.line((0, 264-180+5, 39, 264-180+5), fill = 0)
    draw.line((0, 264-180+4, 39, 264-180+4), fill = 0)
    draw.line((0, 263, 39, 263), fill = 0)
    draw.line((0, 262, 39, 262), fill = 0)

    draw.line((0, 0, 39, 0), fill = 0)
    draw.line((0, 1, 39, 1), fill = 0)


    muc = "München"
    mstr = d['entries'][muenchen]['title'].strip()
    mstr2 = mstr[mstr.find("):")+3:]

    xlen = 0
    xlen = getLengthText(mstr2,font, 264)
    mstr3 = mstr2[0:xlen]
    msRest = mstr2[xlen:]
    xlen = getLengthText(msRest,font, 264)
    mstr4 = msRest[0:xlen]

    addText(image, mstr3, font, 40, 0)
    addText(image, mstr4, font, 60, 0)
    #addText(image, "012345678901234567890123456789", font, 60, 0)

    print(nb.encode('utf-8'))
    xlen = 0
    xlen = getLengthText(nb,font, 264)
    nb1 = nb[0:xlen]
    nbRest = nb[xlen:]
    xlen = getLengthText(nbRest,font, 264)
    nb2 = nbRest[0:xlen]
    nbRest = nbRest[xlen:]
    xlen = getLengthText(nbRest,font, 264)
    nb3 = nbRest[0:xlen]
    nbRest = nbRest[xlen:]
    xlen = getLengthText(nbRest,font, 264)
    nb4 = nbRest[0:xlen]
    nbRest = nbRest[xlen:]
    xlen = getLengthText(nbRest,font, 264)
    nb5 = nbRest[0:xlen]
    
    print(nb1.encode('utf-8'))
    print(nb2.encode('utf-8'))
    print(nb3.encode('utf-8'))
    print(nb4.encode('utf-8'))
    print(nb5.encode('utf-8'))
    addText(image, nb1, font, 80, 0)
    addText(image, nb2, font, 100, 0)
    addText(image, nb3, font, 120, 0)
    addText(image, nb4, font, 140, 0)
    addText(image, nb5, font, 160, 0)
    #addText(image, "abcdef", font, 140, 0)
    #addText(image, "abcdef", font, 160, 0)


    epd.display_frame(epd.get_frame_buffer(image))
    # display images
    #epd.display_frame(epd.get_frame_buffer(Image.open('demopill2.bmp')))

if __name__ == '__main__':
    main()