Yes, @Bitnik the anti-static (pink) bags are significantly cheaper than the silver bags. I actually just bought a couple boxes of them that arrived today and you can get them, depending on size and thickness, for around $5 - $40 for 1000
IIRC the coating used on the pink bags prevents static buildup in the bag itself, but wonât protect the contents from external sources of static (i.e. you can still theoretically fry the contents even before you open the bag, if youâre charged up yourself). The metallic ones form a more complete shield.
So i have been quietly working on version 2 of my DIY midi controller. It is starting to take shape so i thought now is an ok tike to share some progress.
To catch you up on the last update, i sat on my v1:
It has 16 pot knobs, 5 rotary encoders, and two screens.
I went with a design that was more modular and impermanent. Wires will be hooked up into headers placed along the pins of the chips. Basically home made breakout boards.
I also used a more proper project enclosure. I got some tools like a dremel i did not have before that made cutting holes better. I used an epoxy to affix the screens to the box, i should have sanded the epoxy better for a more flush look, but this is a utilitarian design first and formost. Once it is operational, i can focus on making it more perty.
I mounted the breakout boards to a separate removable bit of wood from a cigar box, which is itself mounted to the bottom of the box with flush flat m3 screws. I wanted this to be somewhat easier to put together, take apart and troubleshoot.
The brains is a teensy 3.2. I went with this because i can use usb midi protocol, but this same project could be handled with a 5 pin midi serial and a nano. I just wanted less cables than v1. The nano would make this build cheaper though so its not âstrictly betterâ.
Coming along nicely! Exciting!
I finished the wave folder I was experimenting with. It is based on a design by Dan A.
On the left oscilloscope you can see the input signal of the wave folder, on the right oscilloscope the output signal of the wave folder. While Iâm turning the knobs, in the background you can hear the accompanying sound. The top knob sets the dry/wet ratio. The 2nd knob the DC-offset fed into the system. If the input signal is strong enough, the LEDs (EDIT: each pair consists of 2 LEDS anti paralell to one another) light up and if the DC-offset is zero, both will be equally bright. The brightness depends on the signalâs amplitude. The switches are there to select either the red or green pair of leds that are used for the wave folding. There are 2 folding sections in the circuit, both have their own led pairs.
The recording starts in the dry situation, so you see the input signal on the RHS at the start as well.Then I show the wet signal and fiddle around with the offset. Typically this leads to clipping. But the whole effect is very much dependent on the input signalâs amplitude, so off camera I now and then change the input voltage and adjust the mixerâs gain to end up with a somewhat constant volume of the signal. An example of that can be found around 2m02 when the sound changes quite a bit because I change the input signalâs amplitude.
Thatâs awesome, I have a cut patch cable, thatâs not ideal. With this small part you can connect it directly to the oscilloscope, nice
The wavefolder is cool ! But i want that scope
Patience, patience, patience âŚ
One of my weaknesses
That is something which comes with the modern world. Instant gratification else disappointment is another one of those new virtues.
Itâs not that bad for me yet! I also find it terrible that everything has to be available to everyone at all times.For example meat⌠I say anticipation is the greatest joy and still I would rather have the oscilloscope today than tomorrow
How have you got 5 encoders?
(off to look it up)
Rob
The listing on amazon had a group of 5. Current setup can support at least 8 with the MCP23017 IO expander. The IO expander and both screens share the serial bus. The idea is to use hardware interrupts for the expander so that i dont miss any pulses. If i bought more, i should be able to support around 16 easy in the next version. I think i like the encoders more, so i will prolly be using them in my future designs. I was also running outta space in this box. I think once the design gets to the PCB stage it will be a lot easier to fit everything in there.
Here is the pinout for the MCP23017 if you were curious:
Worry not, i plan on covering the design in more detail once this is farther along.
Not really build progress - but functionally progress.
The 2-Roll LFO x8 is modified for sending CV Pulses via the Red Bananaâs (Positive Pulse Out) and meant to generate rhythmic CV Pulses by inter patching the 16 Brown Nodes.
Some were curious on the functionality of the 2-Roll LFO x8 outside of just pairing with ciat-lonbarde Instruments, so here it is sending CV to the Triple Splashback Delay.
have you tried writing to eeprom to store the encoder positions for power cycle? I did that to store DMX addressing (9 data bits threw my a curve ball on that for a few hours)
Rob
Data persistence has not entered my mind. I was going to just use them as relative positioned knobs anyway so its really not super duper important.
almost there , this was a quick prof of concept on making face panels .
just need to mount pcb on back .
old school layout . cut and paste , scan , print , cut , laminate , spray glue , apply .
A friend of mine built me a 3rd Row for my KOSMO Rack
Just picked it up on the way home from work tonight!
nice , funny how the rows keep adding up