Nurdspace eurorack raspberry pi hat: Difference between revisions

From NURDspace
Line 22: Line 22:
* being able to also run without a real eurorack powersupply (it produces its own -5V by using an ICL7660)
* being able to also run without a real eurorack powersupply (it produces its own -5V by using an ICL7660)
* <s>based on</s>inspired on https://micro-twin.com/hardware.php
* <s>based on</s>inspired on https://micro-twin.com/hardware.php
==== to do ====
* double check 3.3V power consumption of parts
==== Second version ====
* more analogue in, 12 bit resolution by using a MCP3204 or MCP3208 or so?
* more analogue out, gates in
* also gates out
* LEDs for gate status
* pins for neopixel connection (gnd + signal)
* I2C breakout (for e.g. small displays)
* SPI extender? (does something like that exist?)
* SMD technology maybe?


=== schematics ===
=== schematics ===

Revision as of 21:50, 15 July 2022

Eurocrack-hat
Nurd-euro-pi.jpg
Participants
Skills Electronics, Programming
Status Active
Niche Music
Purpose Fun
Tool No
Location
Cost
Tool category Electronics,Eurorack

Eurocrack-hat

Nurd-euro-pi.jpg {{#if:No | [[Tool Owner::{{{ProjectParticipants}}} | }} {{#if:No | [[Tool Cost::{{{Cost}}} | }}


specifications

The title says it all.

First version has:

  • 2x analogue in (10 bit resolution, MCP3008)
  • 2x analogue out (12 bit resolution, MCP4922)
  • 2x gate in
  • being able to also run without a real eurorack powersupply (it produces its own -5V by using an ICL7660)
  • based oninspired on https://micro-twin.com/hardware.php

to do

  • double check 3.3V power consumption of parts

Second version

  • more analogue in, 12 bit resolution by using a MCP3204 or MCP3208 or so?
  • more analogue out, gates in
  • also gates out
  • LEDs for gate status
  • pins for neopixel connection (gnd + signal)
  • I2C breakout (for e.g. small displays)
  • SPI extender? (does something like that exist?)
  • SMD technology maybe?

schematics


0...3.3V to -5/+5V

falstad circuitjs simulation

The opamp needs +5 and -5 for power.

calculated with https://masteringelectronicsdesign.com/differential-amplifier-calculator-2/

Circuit-20220715-2051.png


-5/+5V to 0...3.3V

falstad circuitjs simulation

The opamp needs +3.3V and 0V for power.

Circuit-20220709-1750.png


software

  • I've chosen a DAC and ADC with SPI to easily connect them to a raspberry pi.
  • gate signals can be toggled via e.g. wiringpi