Projects on Simon Juhl

Pile of Decay

Mon, 24 Aug 2026 12:37:40 +0000

Inspired by Minesweeper and Mamono Sweeper, this game involves items, bugs (the kind with legs), garbage, goblins etc. You delve deeper into a compost pile and find a diverse range of critters and items. You gain experience as you defeat your encounters, granting you a higher level that will allow you to defeat stronger critters, and so on. The trash you find can be traded for useful trinkets at the Garbage Goblin’s shop.

Sludge Department

Mon, 14 Jul 2025 15:35:58 +0000

“Sludge Department” is an interactive puzzle game, with a spooky story and atmosphere. Available on Itch and steam.

Blåt Lys

Sat, 18 Jan 2025 19:00:00 +0000

I developed wireless DMX hardware using an ESP32 to control wearable lights in costumes for dancers at Sylfide’s Blåt lys album release and performance on January 18, 2025. The event combined Nordic folk dance with modern technology, featuring illuminated costumes that projected light patterns in a dark space. I also designed the rest of the general live lighting for the event during the performance, ensuring seamless integration with the wearable lights. The performance included audience participation, allowing attendees to join the dancers on the floor and creating an interactive experience. The wearable lights played a central role in merging tradition with modern elements, enhancing the performance through light and movement.

https://spotted.stiften.dk/gallerier/blat-lys-en-balinstallation

https://www.turkislive.com/koncerter/blaat-lys

https://sylfide.com/bl%C3%A5t-lys-.html

Wireless TV sign

Wed, 06 Nov 2024 23:07:46 +0000

This project features an old modified CRT television with a built-in ESP32 microcontroller. The ESP32 creates a Wi-Fi access point that can be accessed via a smartphone. Through this wireless connection, the text displayed on the TV can be customized as needed. The project was developed as a creative way to display textual information at the music venue Türkis in Aarhus, Denmark. The CRT colors have been adjusted to a turquoise tint, matching the venue’s aesthetic.

The web interface for the TV is simple, consisting of a text field and an “Update” button. Text is formatted by using specific character combinations, such as “(t)” to insert a bitmap of the Türkis logo and “###” to create larger text, similar to Markdown styling.

ATtiny85 Based Sampler

Wed, 22 May 2024 10:22:19 +0000

This project combined two objectives. The first was to create an ATtiny85-based sampler that plays small random sections of a chirp sample, designed for use in a modular system. This is useful for rhythmic synth percussion or sound effects. The second part of the project involved designing a PCB that accommodates all components on one side of the board, with holes for mounting the panel in a Eurorack modular system, integrating both the PCB and front panel.

Source code and schematics for the project can be found on GitHub.

SPOT Festival 2023 – Kaelertag

Mon, 15 May 2023 19:24:34 +0000

I performed as Vj (Video Jockey) for electro-punk band, Kælertag, at Klubscenen, during SPOT Festival, Aarhus. The 6th of May 2023.

📷 Photographs by Mads Bech see the full album here

Undervolting Casio SA-20

Sun, 26 Dec 2021 21:14:00 +0000

I have experimented with the Casio SA-20, by reducing the power-supply voltage from 7.5V down to 4.1V. at this voltage the instrument starts to sound strange and become very glitcy. The keyboard makes random noises in a way that seems like internal datalines are being filled with errors resulting in wrong serial messages, hence the random sounds. It is still keeping up rythms very nicely though, so i have recorded some of the rythm/accompaniments from it, and uploaded them at freesound.org.

The sample-pack can be found here

Here is an example of how the Casio SA-20 acts when undervolted

Output Festival 5

Sat, 23 Oct 2021 12:47:00 +0000

I performed as VJ (Video Jockey) at Output Festival 5, held at Rå-Hal – Godsbanen, Aarhus. 22-23 of October 2021. I also exhibited a couple of artworks as well.

Mix of VJ sessions at the festival

Flickering Container

Thu, 05 Aug 2021 11:09:04 +0000

This artwork is a old wooden, golden frame. I replaced the glass with chicken fence and plastic. The plastic has been heated so it is slightly melted. Underneath the plastic is mounted leaves on boards with LEDs underneath. The LEDs under the leaves glows in different colours while LEDs underneath the mounted leaves flicker on and off like fluorescent lights. The very back of the artwork is an old wooden plate with wallpaper still on it. A mixture of dirt and wallpaper paste has been smeared over the backwall. The whole piece glows and flickers randomly while seeming somewhat alive.

The piece was displayed at Output Festival 5, October 2021 together with other works.

Watch the video below to see the artwork flickering and glowing:

ATtiny85 envelope module

Thu, 02 Apr 2020 18:09:51 +0000

Decay-envelope-module based on a single ATTiny85 microcontroller with multiple outputs based on triggering.

Features:

Gate signal for when the envelope is active
Rising edge trigger output
Decay/release length
Digital envelope output

SOURCECODE

Clock multiplier

Tue, 24 Mar 2020 13:39:14 +0000

This is a clock multiplier made for musical purpose, such as synthesizer/modular-systems or other things that would send out or receive 5v pulses. The current code is written for a ATTiny85, but should work fine on any Arduino etc.

The program measures the time between each pulse input, and outputs a repeating pulse with an interval defined by the variable ‘mult’. There are 3 more inputs/outputs avalible if using and ATTiny85 these are currently used for changing mult, but could be replaced by an potentiometer for a wider range of tempos.

I have uploaded the code for the microcontroller to Github: HERE

TimeStep Sequencer

Mon, 16 Mar 2020 13:37:48 +0000

This is a sequencer made for controlling modular systems. It has 8 knobs controlling the time/length of each step and 8 knobs controlling the CV output for each step, generating interesting rhythmic patterns. The sequencer has a random mode, start/stop, two time-multipliers and a slide switch.

The sequencer is based on a teensy 2.0 source code can be found here

Noise Toolbox

Tue, 21 Jan 2020 21:09:25 +0000

This is a modular synthesizer build with focus on noise music or non-musical purpose. Using different effects, filters distortion etc. weird noise can be generated through feedback loops or external input.

Overview

The unit contains the following modules:

3 delay modules
3 distortion/wavefolds
2 tone controls
1 dual equalizer
1 3×3 matrix mixer
1 oscilator/LFO
1 VCO module
1 external instrument input
1 digital noise module
2 resonance filters
2 mults
2 mixes
1 mixer for output

4 Voice drone-machine

Thu, 31 Oct 2019 22:18:25 +0000

This is a drone machine consisting of four identical oscillators. Each oscillator can be tuned by two potentiometer; course and fine.

A patch-bay on the instrument are used to cross modulate the different oscillators, through frequency divisions.

The machine also have a tone-control and volume control for controlling the output.

Video Synthesizer

Thu, 13 Dec 2018 13:41:00 +0000

Video Synthesizer

This is a video synthsizer cable of synthesizing a VGA signal. The instrument/tool is based on a VGA-test module, with its VGA-output broken into multiple signals. The signals can be patched through different other modules such as a clock divider etc. The insturment can be used for VJ’ing og just pure fun.

The Testing module breaks out into each color-channel, horizontal and vertical -video sync. The picture coming from the tester can be changed using a gate signal trough an external mini jack.

View this post on Instagram

A post shared by @simonjuhl_

Conductive Touch synthesizer

Sun, 23 Sep 2018 17:44:53 +0000

This is a polyphonic synthesizer made schmitt-trigger oscillators. Signals from each Individual oscillator is transfered through finger/flesh and into the mix. This also make it super noisy.

The circuit for this projects is very simple. 12 schmitt-trigger oscillators are all connected to different copper-pads, which line up with copper-pads going to the output-mix. When both copper-pads are touched by skin or other conductive material, the singal goes though to the mix and the sound can be heard.

Since the mixer has a lot of unconnected parts when not touching anything a lot of noise i coming out of the amp (i used a LM386, maybe a less noisy application?).
I tried putting a capacitor on the mixed signals, this seems to be making the signal sort of weak but more soft and less noisy.

Electric Motor Synth/Drone

Fri, 20 Apr 2018 17:38:15 +0000

This is a homemade synth/drone is based on 4 tiny electric motors, each with 0-5v CV. An internal piezo amplifies the vibrations from the motors so the sound can be plugged into a mixer etc.

Schematics

Here are some more build pictures on instagram: Link

Each motor is driven by an NPN-transistor in this case: 2N2222. An opamp is controlling the voltage aplied to the motor.
I used a TL074 op-amp for my project, but any op-amp should do.
potentiometers can be put between CV or 5v to attenuate the speed of the motors.
For the amplifiing the piezo i used a LM386.
I am not an expert in electronics so these scehamtics can problerbly be improved