Rolf R Bakke
Lazy Bee with 1260 LEDs for night flying
updated
Cub: Lasse
Twin Otter: me
Replaced the stock exhaust, for a bit more "sporty" sound!
It satifies my inner 12 year old!
Drones are dangerous, dont let them see you!!!
Made with Corrscope.
KK2 flight controller.
HeadPlay HD goggles.
Connex ProSight HD digital video link.
GoPro Hero 3
2205-2600KV motors with 5 4.5 in props
GS 30A ESCs
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Top speed is about 29km/t
Speed in video is about 20kmt with 3/4 throttle.
One unique feature is the front mounted engine that eliminates steering and throttle cables.
Some upcoming improvements:
1: Fins on the stern to make it stable on plane. (Avoids those pesky spin-outs)
2: Move throttle to handlebars.
3: Add XPS foam side skirts.
4: Get a paddle!
This tune ony uses the triangle waveform, and some envelope trickery and sound masking to make it sound richer than a standard 1986 single waveform SID tune.
First part is a view of the clutch servo, and the gear changes is audible.
I have cleaned and checked the angle sensor, clutch servo, gear change servo and wires.
This only happens when turning the key, never when driving.
Anyone knows where the problem is?
Some fools put the phone on one of the trains in the gingerbread town.
The world's biggest gingerbread city. Miniature houses, trains, cars and ships made from real gingerbread. Schools and kindergartens contribute every year in making a miniature version of Bergen - all in gingerbread-cookies!
youtube.com/watch?v=PCyUxlsRoRc
This setup is supposedly good for 200km/t.
Video is a bit glitchy for unknown reasons.
Motor controller from Ebay. (60A, brushed)
Battery level indicator is 10 LEDs + Arduino Nano.
All hardware and firmware made by me.
Battery is an old E-bike battery re-arranged to 4s12p, 17Ah.
Top speed: 7km/t (3.78 kt)
Max power: 600W.
Range at 7km/t: 4km.
Range at 5km/t: 7km.
Chamber is a steel bowl with a 12mm Polycarbonate lid.
What to putin next?
This is the way airport body scanners work, exept they use x-rays.
Also this is my first try at using voice over in my videos.
I have made the electrical system and programmed it in C++.
The huge 100kW dryer is not running during this video.
Our machine consists of an x and y axis mechanism and a spindle, everything else is the dryer which is a separate machine. This company makes fertilizer of horse shit and fish shit.
Sample playback is the newfangled "variable slope and leave the DAC inputs dangling in the breeze."
The number of digi channels is pulled from various comment on the internet, but rummaging through the code it looks like it supports 4 channels, each with a individual 16-step volume setting.
The song is repeated with only the sample track enabled.
Impressive 256 byte demo from LFT:
youtube.com/watch?v=sWblpsLZ-O8
256 bytes is ONE line in the memory view, a 1/256th of the total RAM in the C64.
First instruction being executed is a NOP, lol :) (it turns out this byte has a another purpose, see explanation)
LFT has posted an in-depth technical explanation on his site:
linusakesson.net/scene/a-mind-is-born
Made from 10 x 30 cm acrylic tubing cut in half.
This one was bit of a dog because the SID file contains at least three players, one for the intro, one for main, and one for the rest, which where relocated at run time.
The intro and main tunes has low-pass and band-pass filter enabled. Resonance is at minimum on the intro and about 20% on the main tune.
These settings and the cut-off frequency never change, and makes little to no difference to the sound compared to filters off.
Since one sample is 4-bit, two samples is stored in one byte. The sample playing code plays the high nibble first, then the low one.
Self modifying and duplicate code blocks is used to speed things up.
Sample playing code for the intro tune:
This can play samples at two volumes, full and half. Half volume throws away one bit, making it a 3bit playback instead of 4.
2133 85 E3 STA $E3 // Store accumulator, other registers is not used
*** Alternate between code path for high or low nibble
2135 A5 E4 LDA $E4
2137 D0 27 BNE $2160
*** Code path for high nibble
2139 AD xl xh LDA $xhxl // Read a new sample byte from RAM at address $xhxl. This address is modified by line 216F and 2174
213c C9 1F CMP #$1F // Compare with end-of-sample marker $1F
213e D0 0C BNE $214C // = Branch if Not Equal
2140 A9 00 LDA #$00 // Equal, turn of sample playback
2142 8D 0E DD STA $DD0E
2145 A9 38 LDA #$38 // and set volume to base line (half of full)
2147 8D 18 D4 STA $D418
214a D0 2B BNE $2177 // Relative jump to common code path
214c 8D 61 21 STA $2161 // Store sample byte for later use by the low nibble code path
214f 4A LSR A // shift high nibble to low nibble
2150 4A LSR A
2151 4A LSR A
2152 4A LSR A
2153 EA / 4A NOP / LSR A // This is NOP for full volume or LSR A (shift right, divide by 2) for half volume. This is modified by the music player.
2154 18 CLC
2155 69 3v ADC #$3v // Add filter enable bits and volume offset v (0 for full volume or 4 for half volume. This is modified by the music player.
2157 8D 18 D4 STA $D418 // PLay sample!
215a A9 01 LDA #$01 // Set nibble selector to low nibble
215c 85 E4 STA $E4
215e D0 17 BNE $2177 // Relative jump to common code path
*** Code path for low nibble
2160 A9 sw LDA #$sw // Get sample byte saved by the high nibble code path
2162 29 0F AND #$0F // Strip off the high nibble
2164 EA / 4A NOP / LSR A // This is NOP for full volume or LSR A (shift right, divide by 2) for half volume. This is modified by the music player.
2165 18 CLC
2166 69 3v ADC #$3v // Add filter enable bits and volume offset v (0 for full volume or 4 for half volume. This is modified by the music player.
2168 8D 18 D4 STA $D418 // Play sample!
216b A9 00 LDA #$00 // Set nibble selector to high nibble
216d 85 E4 STA $E4
216f EE 3A 21 INC $213A // Modify data field of instruction at $2139: Increase 16bit address by one.
2172 D0 03 BNE $2177
2174 EE 3B 21 INC $213B
*** Common code path
2177 AD 0D DD LDA $DD0D // Clear interrupt flag
217a A5 E3 LDA $E3 // Restore accumulator
217c 40 RTI // Exit NMI interrupt service
Sample playback code for the main tune:
This one is similar to the intro one, but can play samples with three different volumes, full, 1/2, and 1/4.
Full volume is never used, thus wasting 1 or 2 bits of the 4-bit samples.
This one also resides in page zero, a 256 byte RAM area normally used for storing data for faster access. This speeds it up a bit.
It contains one completely unnecessary instruction! Can you find it? :)
00a0 D8 CLD
00a1 85 0B STA $0B
00a3 AD xl xh LDA $xhxl
00a6 C9 1F CMP #$1F
00a8 D0 0C BNE $00B6
00aa A9 00 LDA #$00
00ac 8D 0E DD STA $DD0E
00af A9 38 LDA #$38
00b1 8D 18 D4 STA $D418
00b4 D0 2A BNE $00E0
00b6 24 0A BIT $0A
00b8 30 12 BMI $00CC
00ba 4A LSR A
00bb 4A LSR A
00bc 4A LSR A
00bd 4A LSR A
00be EA / 4A NOP / LSR A
00bf EA / 4A NOP / LSR A
00c0 18 CLC
00c1 69 3v ADC #$3v
00c3 8D 18 27 STA $D418
00c6 A9 80 LDA #$80
00c8 85 0A STA $0A
00ca D0 14 BNE $00E0
00cc 29 0F AND #$0F
00ce EA / 4A NOP / LSR A
00cf EA / 4A NOP / LSR A
00d0 18 CLC
00d1 69 3v ADC #$3v
00d3 8D 18 27 STA $D418
00d6 A9 00 LDA #$00
00d8 85 0A STA $0A
00da E6 A4 INC $A4
00dc D0 02 BNE $00E0
00de E6 A5 INC $A5
00e0 AD 0D DD LDA $DD0D
00e3 A5 0B LDA $0B
00e5 40 RTI
05 20 13 0F 15 0E 04 13
20 0C 09 0B 05 20 01 20
02 12 0F 0B 05 0E 20 03
04 2E 2E 2E
It can neither ride a bike!
Answer: The same as yours, you're the bus driver.
The digi sounds is procedurally generated by small code blocks in the sid file, like this one:
0000 A0 05 LDY #$05
0002 A9 94 LDA #$94
0004 18 CLC
0005 69 40 ADC #$40
0007 8D F8 42 STA $42F8
000A A2 19 LDX #$19
000C B9 05 43 LDA $4305,Y
000F 38 SEC
0010 E9 01 SBC #$01
0012 D0 FB BNE $000F
0014 A5 DE LDA $DE
0016 18 CLC
0017 69 65 ADC #$65
0019 85 DE STA $DE
001B 29 0F AND #$0F
001D 8D 18 94 STA $D418
0020 CA DEX
0021 D0 E9 BNE $000C
0023 88 DEY
0024 10 E4 BPL $000A
It is basically a loop containing a a variable delay and a formula generating a new number between 0 and 15 stuffed into the volume register $d418.
There where one loop per digi-sound with different delays and formula.
No NMI interrupt used.
Screenshot of the sounds: http://imgur.com/gallery/i6pmD
Another video of it here: youtube.com/watch?v=BeHqH9QO5dA
and here: youtube.com/watch?v=wxXu_rmLeNs
How it's made: youtube.com/watch?v=De4BwjVnqKc
Beautiful bird.