ATtiny84-TinyCalibrator
relay-bypass
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ATtiny84-TinyCalibrator | relay-bypass | |
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1 | 14 | |
48 | 30 | |
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0.0 | 5.0 | |
over 1 year ago | 9 months ago | |
C++ | C++ | |
GNU General Public License v3.0 or later | MIT License |
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ATtiny84-TinyCalibrator
relay-bypass
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Thoughts on a tutorial for true relay bypass
Not to discourage it, but FYI on what's already out there for AVR: https://github.com/mstratman/relay-bypass
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So many pedals use relay soft footswitching now days, is there a "standard" circuit they all use for it?
All open source: https://github.com/mstratman/relay-bypass
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Recent build: Green Ringer with j-fet blender and soft momentary/latching EQD type FS, all stuffed in a 1590a!
u/cedarcedar If you're curious you can see its code here: https://github.com/mstratman/relay-bypass/blob/main/relay-bypass/relay-bypass.ino
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source for illuminated push buttons
if you find momentary buttons that are suitable, use them to control a relay. e.g. with this kit or from scratch.
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How to wire a dual channel pedal where one switch turns off the other?
An alternate option, which you probably also won't find an off-the-shelf solution for, is to use a microcontroller and a couple of relays. You can steal 90% of the bones from my project here: https://github.com/mstratman/relay-bypass Switch to an attiny84 or something else with more pins, add a second foot switch, get rid of the muting, and add the toggle logic.
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Quick and easy upgrade: Soft-touch (EQD style) Bypass
Tonight I added an EQD-style relay bypass using a MAS Effects kit to somebody's pedal and took a few pics to share in case anyone's interested in seeing how you do this sort of upgrade (disclaimer, shameless self promotion, but FYI it's also open source). It's a good first project for anyone wanting to dip their toe in the DIY pedal waters.
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Options for soft switch bypass kits?
Or if you want to completely DIY the MAS Effects one without a kit, all the code and schematics are here: https://github.com/mstratman/relay-bypass (but again, check parts availability first since the relays and AVR are hard to find).
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Drop-in EQD-style soft touch foot switch module (tiny foot print) just got even easier!
[schematics, code, etc are all here] [kits here]
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Krampus Fuzz - high gain silicon (Hot Silicon variant)
The footswitch controls a relay that's powered by the code from this project: https://github.com/mstratman/relay-bypass (from which you can buy drop-in kits to get soft touch true bypass on your pedals). This one has a bigger, cheaper relay since space wasn't at a premium the way it is on those drop-in kits.
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Add MIDI control to relay bypass switching
Schematic: https://github.com/mstratman/relay-bypass/blob/main/relay-bypass-schematic-1.3.png
What are some alternatives?
Attiny85 - RubberDucky like payloads for DigiSpark Attiny85
arduino_midi_library - MIDI for Arduino
Tiny4kOLED - Library for an ATTiny85 to use an SSD1306 powered, double buffered, 128x32 pixel OLED, over I2C
eagle-hvsp-wing-shield - High Voltage Serial Programmer wing shield for Arduino
lcdgfx - Driver for LCD displays running on Arduino/Avr/ESP32/Linux (including Rasperry) platforms
MiniCore - Arduino hardware package for ATmega8, ATmega48, ATmega88, ATmega168, ATmega328 and ATmega328PB
MightyCore - Arduino hardware package for ATmega1284, ATmega644, ATmega324, ATmega324PB, ATmega164, ATmega32, ATmega16 and ATmega8535
ssd1306 - C++11/17 driver to operate SSD1306 OLED using AVR8.
ATtiny13-TinyUPS - Uninterruptible Power Supply
PJON - PJON (Padded Jittering Operative Network) is an experimental, arduino-compatible, multi-master, multi-media network protocol.
pcd8544 - Minimal footprint library for Philips PCD8544 LCDs on the Arduino.
tinytricks - Tiny Tricks - Modules for VCV Rack