Not the nicest code, but it works. This is the part to actually send data to the OLED:
fivelines.py:
#!/usr/bin/env python
import sys
from oled.device import ssd1306, sh1106
from oled.render import canvas
from PIL import ImageFont
font = ImageFont.load_default()
device = ssd1306(port=1, address=0x3C)
with canvas(device) as draw:
x = 2
top = 0
font = ImageFont.truetype('/opt/ssd1306/examples/alert.ttf', 12)
draw.text((x, top+0), sys.argv[1], font=font, fill=255)
draw.text((x, top+13), sys.argv[2], font=font, fill=255)
draw.text((x, top+26), sys.argv[3], font=font, fill=255)
draw.text((x, top+39), sys.argv[4], font=font, fill=255)
draw.text((x, top+52), sys.argv[5], font=font, fill=255)
You can simply output data by executing “./fivelines.py line1 line2 line3 line4 line5” and you will get five lines on the display. I wrote a Bash-script (don’t like Python, it’s easier to collect the data with bash) to call fivelines.py:
oled.pl
#!/bin/bash
aircraftjson=/run/dump1090-mutability/aircraft.json
hexdbdaily=/usr/share/dump1090-mutability/dbicao24/hexdb-`date +%Y%m%d`.txt
icaocount=/usr/share/dump1090-mutability/dbicao24/icaocount.txt
tempjson=/tmp/pretty.json
# Line 1
line1="`date +'%d.%m.%Y - %H:%M:%S'`"
# Line 2
icaocount=`cat $icaocount`
seentoday="`wc -l $hexdbdaily | cut -d ' ' -f 1`"
# Line 3
cat $aircraftjson | json_pp -f json -t dumper -json_opt pretty > $tempjson
acmes=`cat $tempjson | grep "messages" | wc -l`
accat=`cat $tempjson | grep "category" | wc -l`
acpos=`cat $tempjson | grep "seen_pos" | wc -l`
# Line 4
up=`uptime | sed -E 's/^^,]*up *//; s/, *:digit:]]* users.*//; s/min/minutes/; s/(:digit:]]+):0?(:digit:]]+)/\1 hrs, \2 min/'`
# Line 5
cpu=`top -bn1 | grep "Cpu(s)" | sed "s/.*, *\([0-9.]*\)%* id.*/\1/" | awk '{print 100 - $1"%"}'`
/usr/share/dump1090-mutability/dbicao24/fivelines.py "$line1" "$seentoday A/C Today ($icaocount)" "$acmes/$accat/$acpos A/C Now" "Up: $up" "CPU: $cpu"
This is just to get an idea how it works, the stuff for line 2 won’t work on your system.
Of course you can play with number of lines and font-size:
Klaus
