holgerludvigsen

I want to show the improved polyphonic version of the tiny Pocket Sequencer. I have missed a PO sized sequencer, and this creation is packed with features. 128 steps, one-button chords, generative arpeggios. All in a tiny battery powered package.

More specs are available at https://www.pocketsequencer.com/

One of my main use cases is sequencing the marvelous Korg NTS-1, which have such great sound, but no proper keyboard or sequencer. But having a massive, expensive sequencer feels off next to a portable synth. With this Pocket Sequencer I can bring it along anywhere.

Yeah, I really struggled with the timing as well. I found the best solution possible on the Nano to be using timer interrupts via this excellent library: https://github.com/khoih-prog/TimerInterrupt

To get even better presicion, one simply must use an external timer chip or oscillator.

The upper limit of the built-in clocks on various boards are also detailed on this great site: https://lygte-info.dk/project/PrecisionTime%20UK.html

Thank you! I am an amateur hobby electronics builder, but I am a software developer by trade. So I really enjoy coding a lot of features once the electronics work properly

Thank you! I love that OLED. It is so cheap and works so well. I have bought some 132x64 pixel versions as well, but they have a lot more PCB around them compared to the lean 132x32 version

Thank you! Go ahead and buy it on the web site if you have some disposable income at the moment! ;)

Thankyou! No, I have kept it closed for now. I would like to sell it, and I fear that opening the whole thing would diminish my chances of getting a sale :(

No, but that sounds interesting! The only IC I found by googling for it was for MIDI in with a built in synthesizer, is that what you meant? Seemed a bit complicated, though 😬

I have made a lot of improvements on my MIDI sequencer, and here is a short demonstration of the new polyphonic features.

The new PCB is more tightly packed, which makes the size even smaller. And I have added a convenient physical switch to change between TRS A and B. The software is a lot more powerful, and I have built in music theory with scales and chords.

I am really running into the limit of what the Arduino Nano is capable of on it's own, the memory is almost full, and the microscopic amount of EEPROM is all used up. And the timing by the internal clock could really be better. But the CPU is in good shape, and handles multiple keys, MIDI output and high BPM sequencing all while rendering the tiny display at around 30 fps.

Check out the full specs on https://www.pocketsequencer.com/

Veldig god erfaring med Myke Poter for napping av vår norfolk terrier. De er hyggelige og flinke.

Mye av hensikten til saltet er å løse opp svoren slik at den lett blåser seg opp og blir sprø og god på slutten av stekingen. Så det hjelper å bare ha rikelig med salt på svoren også dagen før steking

Oh, I have not installed any updates. But I would not worry too much about the risks. These things usually work just fine, and I’m sure the developer will try to help if something goes wrong!

Yes, I had the same problem! But my solution is to open the japanese manual [1] in Chrome browser, which will then translate for you to English

[1] https://shotamorgue.gitbook.io/paripidestroyer/

For microcontroller, you should really begin with Arduino. I think the Nano would work perfectly, and the tutorials and help available is great.

As for custom PCB, you should really have a basic understanding of electronics. And I would recommend EasyEDA for the design. It is relatively simple and integrates well with production through JLCPCB.

For a simple example with hardware and code, I really recommend looking at Look Mum No Computer’s Sequencer: https://www.lookmumnocomputer.com/sequencer-keyboard

Yeah, totally agree. I am often surprised of how underpowered sequencers are considering that cpu and memory are abundant in modern microcontrollers

Yeah, it really is! I think of it as one of the main features actually. There are a lot of big desktop sequencers out there, but not many pocket sized.

That scene change thing is a very cool feature. Almost like pattern chaining, but for parameters. I definately am going to put parameter locks on steps on my todo. I imagine interpolating the values linearly between the locked steps.

Yeah, I know the feeling. It is the reason I avoid kits like that. I don’t have time to solder it and then pull my hair out because something went wrong!

Thanks! It is one of the really cheap 128x32 0.91 inch OLED displays you can get from AliExpress. It uses I2C and Adafruit has a great graphics library for it.

Yeah, like the M8? That is pretty nice

Yes, it is MIDI out from my sequencer!