goodbye X10, hello trådfri …

scruss/ihsctrl: a package of bash scripts to control selected IKEA Home smart (aka “TRÅDFRI”) devices via their network gateway

The old X10 devices were getting really unreliable: seldom firing at all, getting far too hot, bringing a whole lot of not working to my life. So while it was kind of cool to have my lights controlled by an original 256 MB Raspberry Pi Model B from 2012, it was maybe working one schedule out of ten.

So it had to go: replaced by a Raspberry Pi Zero W and a whole lot of IKEA TRÅDFRI kit. I was deeply unimpressed with the IKEA Home smart app, though: you couldn’t use even basic schedules with more than one light cycle per day. So while I know there are lots of clever home automation systems, I wanted to replace my old cron scripts and set about writing some simple command tools. The result is ihsctrl: very limited, but good enough for me. It’s been working exactly as expected for the last week, so I’ll finally get to wade through 8 years of cobwebs and dismantle the old X10 setup. I already miss the 06:30 clonk of the X10 controller turning the front light on — that was my alarm clock (or alarm clonk) every morning.

(local copy:

this is why I did wind power instead

07:32 - This is a Province of
Ontario emergency bulletin
which applies to people
within ten (10) kilometres
of the Pickering Nuclear
Generating Station. An
incident was reported
at the Pickering Nuclear
Generating Station. There
has been NO abnormal

Update, a few panicked minutes later: false alarm. Still no news release from OPG or province-wide phone alert to stand down, but there is this:

Just as a reminder, you can get potassium iodide pills for free if you live within 50 km of an Ontario nuclear installation. Go to

50 km buffer from GTA nuclear stations
50 km buffer from Pickering and Darlington nuclear stations. Includes all of Toronto and much of the GTA
50 km buffer from Bruce station
50 km buffer from Bruce station

I don’t know if I should be including Chalk River in this.

Further update: yup, they retracted it. But a scary wee-waa-wee-waa siren while the text is read in a robot voice is not very reassuring


There is NO active nuclear
situation taking place

at the Pickering Nuclear
Generating Station. The

previous alert was issued in
error. There is no danger to
the public or environment.
No further action is
Issued 09:11

I was today years old when I first bought Legal size paper for a bureaucratic application …

I was today years old when I first bought Legal size paper for a bureaucratic application …

I was today years old when I first bought Legal size paper for a bureaucratic application …

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For completeness: Level 9 “Snowball” bitmap font

The Snowball font on the Amstrad CPC 464

Oooh blecch — did I really like this when I was a young ‘un? Following on from the same process as in The coolest font (when I was 15, that is) here’s the bitmap font from Level 9’s Snowball.

 10 REM    *** L9SFONT.BAS ***
 15 REM bitmap font from Level 9's
 20 REM Snowball text adventure
 30 REM  on the Amstrad CPC 464
 40 REM (it was so cool at the time…)
 50 REM Dug up by scruss, 2020-01
 60 REM ==============================
 110 MODE 1
 120 GOSUB 1000
 130 PRINT" *** It's the Level 9 font ***"
 140 PRINT" ***    from  Snowball!    ***"
 150 PRINT"   Dug up by scruss, 2020-01"
 160 PRINT
 170 PEN 2
 180 PRINT"Lorem ipsum dolor sit amet, consectetur"
 190 PRINT"adipiscing elit, sed do eiusmod tempor"
 200 PRINT"incididunt ut labore et dolore magna"
 210 PRINT"aliqua. Ut enim ad minim veniam, quis"
 220 PRINT"nostrud exercitation ullamco laboris"
 230 PRINT"nisi ut aliquip ex ea commodo consequat"
 240 PRINT"arfle barfle gloop? | | |"
 250 PRINT
 260 PEN 1
 270 FOR i%=32 TO 127
 280 PRINT CHR$(i%); " ";
 290 NEXT i%
 300 PRINT
 310 PRINT
 990 END
 1000 SYMBOL 33,&10,&28,&28,&28,&10,0,&38,0
 1010 SYMBOL 34,&66,&66,&44,&88,0,0,0,0
 1020 SYMBOL 35,0,&24,&7e,&24,&24,&7e,&24,0
 1030 SYMBOL 36,&10,&7c,&40,&7c,&04,&7c,&10,0
 1040 SYMBOL 37,&e4,&a4,&e8,&10,&2e,&4a,&4e,0
 1050 SYMBOL 38,&70,&88,&88,&72,&84,&88,&76,0
 1060 SYMBOL 39,&0c,&0c,&08,&10,0,0,0,0
 1070 SYMBOL 40,&0c,&10,&30,&30,&20,&14,&0c,0
 1080 SYMBOL 41,&30,&28,&04,&0c,&0c,&08,&30,0
 1090 SYMBOL 42,&10,&54,&38,&fe,&38,&54,&10,0
 1100 SYMBOL 43,0,&10,&10,&7c,&10,&10,0,0
 1110 SYMBOL 44,0,0,0,0,&18,&18,&10,&20
 1120 SYMBOL 45,0,0,0,&fc,0,0,0,0
 1130 SYMBOL 46,0,0,0,0,&1c,&14,&1c,0
 1140 SYMBOL 47,0,&06,&0e,&08,&10,&70,&60,0
 1150 SYMBOL 48,&fc,&8c,&8c,&84,&c4,&c4,&fc,0
 1160 SYMBOL 49,&30,&10,&10,&10,&18,&18,&38,0
 1170 SYMBOL 50,&f8,&98,&08,&f8,&80,&c8,&f8,0
 1180 SYMBOL 51,&7c,&64,&04,&3c,&34,&04,&7c,0
 1190 SYMBOL 52,&c8,&88,&88,&f8,&08,&18,&18,0
 1200 SYMBOL 53,&f8,&98,&80,&f0,&08,&c8,&f0,0
 1210 SYMBOL 54,&78,&98,&80,&f8,&98,&c8,&f8,0
 1220 SYMBOL 55,&fc,&c4,&04,&08,&08,&18,&18,0
 1230 SYMBOL 56,&fc,&c4,&8c,&fc,&84,&9c,&fc,0
 1240 SYMBOL 57,&fc,&e4,&84,&fc,&04,&0c,&0c,0
 1250 SYMBOL 58,&38,&28,&38,0,&38,&28,&38,0
 1260 SYMBOL 59,&18,&18,0,&18,&18,&10,&20,0
 1270 SYMBOL 60,&04,&08,&10,&20,&10,&08,&04,0
 1280 SYMBOL 61,0,0,&7e,0,&7e,0,0,0
 1290 SYMBOL 62,&80,&40,&20,&10,&20,&40,&80,0
 1300 SYMBOL 63,&7c,&04,&1c,&10,&10,0,&10,0
 1310 SYMBOL 64,&3e,&22,&2e,&2a,&2e,&20,&3e,0
 1320 SYMBOL 65,&fc,&c4,&8c,&fc,&84,&c4,&c4,0
 1330 SYMBOL 66,&f8,&84,&e4,&f8,&84,&9c,&f8,0
 1340 SYMBOL 67,&fc,&8c,&80,&80,&c0,&c4,&fc,0
 1350 SYMBOL 68,&f8,&64,&64,&44,&4c,&4c,&f8,0
 1360 SYMBOL 69,&fc,&8c,&c0,&f8,&c0,&8c,&fc,0
 1370 SYMBOL 70,&fc,&9c,&80,&f8,&80,&c0,&c0,0
 1380 SYMBOL 71,&fc,&9c,&80,&9c,&c4,&c4,&fc,0
 1390 SYMBOL 72,&c4,&c4,&84,&fc,&84,&8c,&8c,0
 1400 SYMBOL 73,&7c,&14,&10,&10,&10,&50,&7c,0
 1410 SYMBOL 74,&7c,&54,&10,&18,&18,&90,&60,0
 1420 SYMBOL 75,&c8,&90,&a0,&d0,&88,&8c,&8c,0
 1430 SYMBOL 76,&c0,&c0,&c0,&80,&80,&98,&f8,0
 1440 SYMBOL 77,&82,&ee,&92,&92,&ba,&82,&c6,0
 1450 SYMBOL 78,&8c,&c4,&c4,&b4,&8c,&8c,&84,0
 1460 SYMBOL 79,&fc,&c4,&c4,&84,&8c,&8c,&fc,0
 1470 SYMBOL 80,&fc,&c4,&8c,&fc,&80,&c0,&c0,0
 1480 SYMBOL 81,&fc,&c4,&c4,&84,&94,&88,&f4,0
 1490 SYMBOL 82,&fc,&c4,&8c,&fc,&90,&c8,&cc,0
 1500 SYMBOL 83,&fc,&84,&80,&78,&04,&84,&fc,0
 1510 SYMBOL 84,&7c,&10,&10,&10,&30,&30,&30,0
 1520 SYMBOL 85,&c4,&c4,&84,&8c,&8c,&8c,&fc,0
 1530 SYMBOL 86,&c4,&84,&84,&48,&48,&30,&30,0
 1540 SYMBOL 87,&84,&84,&84,&b4,&b4,&cc,&84,0
 1550 SYMBOL 88,&cc,&cc,&48,&30,&48,&cc,&cc,0
 1560 SYMBOL 89,&86,&86,&44,&28,&10,&18,&18,0
 1570 SYMBOL 90,&fc,&84,&08,&30,&40,&84,&fc,0
 1580 SYMBOL 91,&7c,&60,&60,&40,&40,&4c,&7c,0
 1590 SYMBOL 92,0,&60,&30,&10,&08,&0c,&06,0
 1600 SYMBOL 93,&3e,&32,&02,&02,&06,&06,&3e,0
 1610 SYMBOL 94,&18,&24,&42,&42,0,0,0,0
 1620 SYMBOL 95,0,0,0,0,0,0,&ee,&bb
 1630 SYMBOL 96,&3c,&22,&78,&20,&78,&20,&7e,0
 1640 SYMBOL 97,0,0,&f8,&98,&88,&cc,&fc,0
 1650 SYMBOL 98,&80,&80,&f8,&98,&88,&c8,&f8,0
 1660 SYMBOL 99,0,0,&f8,&88,&c0,&c8,&f8,0
 1670 SYMBOL 100,&08,&08,&f8,&98,&88,&c8,&f8,0
 1680 SYMBOL 101,0,0,&f8,&80,&e0,&80,&f8,0
 1690 SYMBOL 102,0,&1c,&10,&38,&38,&10,&70,0
 1700 SYMBOL 103,0,0,&f8,&98,&88,&f8,&08,&78
 1710 SYMBOL 104,&c0,&c0,&80,&f8,&88,&cc,&cc,0
 1720 SYMBOL 105,0,&60,0,&60,&60,&70,&70,0
 1730 SYMBOL 106,&08,0,&18,&18,&08,&08,&68,&78
 1740 SYMBOL 107,&c0,&c0,&cc,&d8,&f0,&d8,&cc,0
 1750 SYMBOL 108,&30,&30,&30,&30,&30,&30,&30,0
 1760 SYMBOL 109,0,0,&cc,&b4,&b4,&84,&84,0
 1770 SYMBOL 110,0,0,&f8,&98,&88,&cc,&cc,0
 1780 SYMBOL 111,0,0,&f8,&98,&88,&c8,&f8,0
 1790 SYMBOL 112,0,0,&f8,&98,&88,&f8,&80,&80
 1800 SYMBOL 113,0,0,&f8,&88,&c8,&f8,&0c,&0c
 1810 SYMBOL 114,0,0,&f8,&98,&80,&c0,&c0,0
 1820 SYMBOL 115,0,0,&f8,&80,&70,&08,&f8,0
 1830 SYMBOL 116,&60,&60,&20,&78,&20,&28,&38,0
 1840 SYMBOL 117,0,0,&c8,&c8,&98,&98,&f8,0
 1850 SYMBOL 118,0,0,&cc,&cc,&88,&70,&20,0
 1860 SYMBOL 119,0,0,&84,&84,&b4,&b4,&cc,0
 1870 SYMBOL 120,0,0,&cc,&48,&30,&48,&cc,0
 1880 SYMBOL 121,0,0,&88,&c8,&f8,&08,&08,&78
 1890 SYMBOL 122,0,0,&f8,&90,&20,&48,&f8,0
 1900 SYMBOL 123,&0c,&30,&10,&60,&10,&30,&0c,0
 1910 SYMBOL 124,&df,&db,&db,&9f,&83,&9b,&fb,0
 1920 SYMBOL 125,&30,&0c,&08,&06,&08,&0c,&30,0
 1930 SYMBOL 126,&7c,&82,&ba,&a2,&ba,&82,&7c,0
 1940 SYMBOL 127,&FF,&FF,&FF,&FF,&FF,&FF,&FF,&FF
 1950 RETURN

Process was the same:

  1. Load the disk image into an emulator
  2. Load the game
  3. Save the game as a v2 snapshot – these are uncompressed memory dumps
  4. Dump the snapshot to a png using phooky’s PROM/
  5. Crop that image down to just the character data and save as a plain PBM
  6. For each column, create the hex dump using shell code a bit like this:
sc=32; pnminvert snowball_font.pbm | pnmnoraw | tail +3 | cut --character="1-8"|while read f; do echo "printf '&%02x, \n' "\"\$((2#${f}))\"; done | bash | fmt -w43 | sed 's/,$//;' | while read g; do echo SYMBOL $sc", "$g; sc=$((sc + 1)); done | awk '{print 10 * (NR + 0) " " $0;}' > schars032to063.bas

don’t mind me, just modelling an actual size lo-poly version of the St Louis arch in OpenSCAD …

don’t mind me, just modelling an actual size lo-poly version of the St Louis arch in OpenSCAD …

don’t mind me, just modelling an actual size lo-poly version of the St Louis arch in OpenSCAD …

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