I was working on a MCUME proof of concept, with my own compiled version. But my combination of a Pico and an ILI9341 display didn’t work.
Luckily, a package arrived. My new scope!
A Rigol DS1074Z+ oscilloscope! The replacement of my CRT version.
My new RigolThe old Crt versionNew and old, both with the ESP dual sine demo i’ve posted about.
This new oscilloscope has 4 channels AND there is a add-on for a 16channel logic analyser.
For my next birthday?!? 🙂
The Rigol can be connected to a wired network. So that’s one of the first things I did. (It came with all software options enabled, so no need to ‘fix’ those)
#!/bin/bash
#set -x
f=MAE
numba=$(ls *png | wc -l)
numbastart=$(( $numba - 10))
numbapadding=$( printf "%04d\n" $numba)
numbapaddingstart=$( printf "%04d\n" $numbastart)
echo "$f "
mkdir -p images/$f
mkdir -p metric/$f
for x in $(seq -w 1 $numbapaddingstart) ; do
a=$(( $x + 10))
for y in $(seq -w $a $numbapadding) ; do
compare -fuzz 20% -verbose -metric $f $x.png $y.png images/$f/$x-$y.png 2> metric/$f/$x-$y.txt
echo -n "."
done
done
echo ""
Step 3 : There are metric stats in a subdirectory, let’s find the most matching parts (top 10)
orgpwd=$PWD
: > /tmp/top10
more metric/MAE/* | grep all | awk '{ print $2 }' | cut -f1 -d. | sort -n |head | while read ; do
grep -H all metric/MAE/* | cut -f1,2 -d. | grep " $REPLY" >> /tmp/top10
done
cat /tmp/top10 | cut -f3 -d/ | cut -f1 -d. | while read part ; do
echo mkdir -p "$part"
startpart=$(echo $part | cut -f1 -d-)
endpart=$(echo $part | cut -f2 -d-)
for file in $(seq -w $startpart $endpart) ; do
echo cp 0${file}.png $part/
done
echo cd "$part"
echo ffmpeg -y -framerate 30 -pattern_type glob -i \'*.png\' -c:v libx264 -pix_fmt yuv420p out.mp4
echo cd $orgpwd
done
Run above script as ./script.sh > mybash.sh
This generates a bash file, check the contents and run using
“bash mybash.sh”
Last step : There are 10 movies in subdirs which should contain the best looping parts. check these with: (use CTRL-Q in vlc to stop looping and go to the next file
ls */out.mp4 | while read movie ; do vlc -L $movie ; done
Not posted in the past, new version using ESPHOME and a m5stickc
Previous version using a ESP12
A “watch” with core and environment temperature of my smoker with a alarm, and button for timers.
ESP32 dac’s drawing on oscilloscope ( no additional components)
ESP32 in front of scope, two clips for x and y
For above i used sin/cos functions 2:3, which creates Lissajous figures. See: https://www.henriaanstoot.nl/1992/01/01/oscilloscope-graphics-using-a-amiga-bonus-vectrex/
3 battery operated buttons (no wires needed) to control my shelly dimmer at the dinner table.
left button on, middle steps per 20% and 3rd button off. (This cheapass button only sends ON commands)
Whenever I come across a musical instrument I want to try it.
Dan NhiDan BauKhenOld dude we met, playing a KhenVietnam (2013)
But here are some others I like
Guzheng (Instrument)
Altai – Bai Terek (Band) – Throatsinging and Tovshuur instrument
Alexei Arkhipovskiy – Balalaika
Ney Flute (Egyptian)
Kyiv Ethno Trio – Overtone Flute (no fingerholes)
Largest flute (at the end)
Also cool (Flute with “drone”)
Didgeridoo
Jaw Harp (I’ve got one, but i’m not good at it) also known as : Jew’s harp, mouth harp, Ozark harp, juice harp, murchunga, guimbarde, mungiga, vargan, trompe
Not an ancient instrument, but cool nevertheless. I play Misirlou on BorderPipes using accidentals, I’ll upload this soon.
Found a crappy recording of Misirlou on my Borderpipes. C-sharp, B-flat, F-Natural and G-sharp as accidentals. Hard to play on Great Highland Bagpipe without using a lot of tape. 🙂
While ordering components for a mini C64 project I’m doing with my friend Bigred, I ordered a cheap ST7789-v2 display.
I want to make a generic pico gadget with a display, buttons and sound. This to make a mini device for writing micropython demos.
The 3 tactical buttons are controlling the X,Y and Z axis of the rotating Cube.
Pinout:
PICO
DISPLAY
GP2
Tactical switch (other side to 3v3)
GP3
Tactical switch (other side to 3v3)
GP4
Tactical switch (other side to 3v3)
GP9
CS1
GND
GND
3v3
VCC
GP18
SCL (SPI clock)
GP19
SDA (MOSI / SPI Data)
GP20
RES (reset)
GP17
DC (data command)
GP16
BLK (backlight)
I know it says SCL/SDA (i2c) but it’s SPI controlled.
Used library : https://github.com/russhughes/st7789_mpy/tree/master
Some 3D explanation I drew a long time ago.
Using python you can use the Math funtions. (sin/cos) Note: these are in radians! print(math.sin(math.radians(30))) # 30 degrees
When using MachineCode you can use lookup tables. These are generated tables which hold precalculated sin data for every degree. You don’t have to use both cos and sin! (these are just 90 degrees shifted!)
Erik and I used a little basic program to generate an ASM include file like this
Costab LABEL BYTE
DB 0B4h,0B4h,0B4h,0B4h,0B4h,0B3h,0B3h,0B3h,0B2h,0B2h,0B1h,0B1h,0B0h,0AFh,0AFh
DB 0AEh
DB 0ADh,0ACh,0ABh,0AAh,0A9h,0A8h,0A7h,0A6h,0A5h,0A4h,0A2h,0A1h,0A0h,9Eh,9Dh,9Bh
DB 9Ah,98h,96h,95h,93h,91h,90h,8Eh,8Ch,8Ah,88h,86h,84h,82h,80h,7Eh
DB 7Ch,7Ah,78h,76h,74h,72h,70h,6Eh,6Ch,69h,67h,65h,63h,61h,5Eh,5Ch
DB 5Ah,58h,56h,53h,51h,4Fh,4Dh,4Bh,48h,46h,44h,42h,40h,3Eh,3Ch,3Ah
DB 38h,36h,34h,32h,30h,2Eh,2Ch,2Ah,28h,26h,24h,23h,21h,1Fh,1Eh,1Ch
DB 1Ah,19h,17h,16h,14h,13h,12h,10h,0Fh,0Eh,0Dh,0Ch,0Bh,0Ah,09h,08h
DB 07h,06h,05h,05h,04h,03h,03h,02h,02h,01h,01h,01h,00h,00h,00h,00h
DB 00h,00h,00h,00h,00h,01h,01h,01h,02h,02h,03h,03h,04h,05h,05h,06h
DB 07h,08h,09h,0Ah,0Bh,0Ch,0Dh,0Eh,0Fh,10h,12h,13h,14h,16h,17h,19h
DB 1Ah,1Ch,1Eh,1Fh,21h,23h,24h,26h,28h,2Ah,2Ch,2Eh,30h,32h,34h,36h
DB 38h,3Ah,3Ch,3Eh,40h,42h,44h,46h,48h,4Bh,4Dh,4Fh,51h,53h,56h,58h
DB 5Ah,5Ch,5Eh,61h,63h,65h,67h,69h,6Ch,6Eh,70h,72h,74h,76h,78h,7Ah
DB 7Ch,7Eh,80h,82h,84h,86h,88h,8Ah,8Ch,8Eh,90h,91h,93h,95h,96h,98h
DB 9Ah,9Bh,9Dh,9Eh,0A0h,0A1h,0A2h,0A4h,0A5h,0A6h,0A7h,0A8h,0A9h,0AAh,0ABh,0ACh
DB 0ADh,0AEh,0AFh,0AFh,0B0h,0B1h,0B1h,0B2h,0B2h,0B3h,0B3h,0B3h,0B4h,0B4h,0B4h
CosTabE LABEL BYTE
Basic:
0 DEF SEG = &H7000: c = 0
1 pi = 3.14159265#
2 FOR x = 0 TO 2 * pi STEP 2 * pi / 256
3 d = COS(x) * 127 + 127
4 POKE c, d: c = c + 1: NEXT
Most i learned from a book called “Art of Graphics” (This is image of the book from the internet, i don’t think I still got my copy somewhere.
I made my own Mqtt to speech thingy in the past. Sending a text to a mqtt topic would be picked up by my domoticz raspberry and using a bash script the topic payload was converted to speech and being played on a connected speaker.
