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# LesScope
Arduino based Dual Channel Scope for eurorack-modular synths.
**Table of Contents**
- [Introduction](#intro)
- [Construction Guide](./doc/constructionguide.md)
- [LesScope-Menu](#menu)
- [Technical data](#technical-data)
- [References](#references)
- [License](#license)
## Introduction<a name="intro"></a>
This eurorack-modul is designed for modular-synthesizers as dual channel scope modul.
Only two active parts are required to sample the signal at the jack-inputs.
1. Arduino Nano V3.x.
2. Quad Op Amp MCP6004 rail-to-rail input/output.
The Arduino Nano samples the amplified signal on two 10-Bit A/D multiplexed inputs.
Sampled-data are then traced on the 1.3'' OLED display.
Dataentry and menu-selections are possible with that encoder <u>Select</u>.
AC/DC coupling is selectable for both channels on two switches.
Every channel has two jacks linked together for signal-input and routing to other inputs.
That signal on <u>Channel1</u> is normalized to the <u>Trigger</u> input-jack.
With an additonal cable plugged into the <u>Trigger</u> jack a different trigger-signal can be used.
All parts are common available and DIY-friendly designed.
(Details see attached pictures)
- Modul Frontpanel
- Modul Backside
- Modul Right side
- Modul Left side
- Dual Trace example
## LesScope-Menu<a name="menu"></a>
- Menu example
## Technical data<a name="technical-data"></a>
- size:
height: 3VP (133,35mm)
width : 8HP ( 40,3mm)
depth : 35mm
- power:
+5Volt, 0 mA
+12Volt, 45mA
-12Volt, 0 mA
- display:
128x64 pixel 1.3inch OLED with SPI interface
- MCU:
Arduino Nano V3.x ATmega 328P
- Electrical features:
Rotary encoder with push-button.
Two separate channels with AC/DC-coupling.
Input Voltage 10Vp-p for both channels.
Menu selectable signal-amplification (1...4:Channel1; 1...2:Channel2).
Sampling-rate range: 50us...100msec on both channels.
Separate trigger-input (default linked to <u>Channel1</u>).
- Measurement-capabilities (only on <u>Channel1</u>):
Frequency-measurement range: ~10Hz...~6000Hz.
Tuning-check range: C0(16.35Hz)...C8(4186.01Hz).
There are fife 3.5mm jacks available with following functions.
<table>
<tr>
<th>Jack-Name</th>
<th>Function</th>
<th>Comment</th>
</tr>
<tr>
<td>Channel1 (two jacks)</td>
<td>Signal input for <u>Channel1</u></td>
<td>the two jacks are linked together and <br>this signal is normalized to <u>Trigger</u> input.</td>
</tr>
<tr>
<td>Channel2 (two jacks)</td>
<td>Signal input for <u>Channel2</u></td>
<td>the two jacks are linked together.</td>
</tr>
<tr>
<td>Trigger</td>
<td>Signal input for <u>Trigger</u></td>
<td>this signal is normalized to <u>Channel1</u>.</td>
</tr>
</table>
## References<a name="references"></a>
* [mzuelch Display](https://github.com/mzuelch/CATs-Eurosynth/tree/main/Modules/HAGIWO/Display)
* [frequency measure](http://www.pjrc.com/teensy/td_libs_FreqMeasure.html)
* [encoder](http://www.pjrc.com/teensy/td_libs_Encoder.html)
* [Adafruit SH110X display-driver](https://github.com/adafruit/Adafruit_SH110X/actions)
* [midi conversion table](https://musicinformationretrieval.com/midi_conversion_table.html)
## License<a name="license"></a>
> Hardware:cc by-nc-sa 4.0 ([details](https://creativecommons.org/licenses/by-nc-sa/4.0/))
> Software:licensed under GPL-3.0 ([details](https://www.gnu.org/licenses/gpl-3.0.html.en))
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