I know, I know… another pedal project, right? But stick with me for a second because PENDA (Platform for Effects oNDAisy) brings a few cool twists to the table!
What makes PENDA different?
100% Analog Dry Path: Yep, the dry signal stays fully analog to preserve your tone’s integrity while still offering powerful digital effects.
Large 2-inch SPI Display: Bigger screen, more room to tweak and see what’s going on. Perfect for navigating complex settings or just showing off cool graphics.
4 Encoders with Pushbuttons: More control at your fingertips—literally! Easily dial in precise adjustments without feeling cramped.
The whole design is based on the Daisy Seed board, but with these added features, I think it stands out in its own way.
What do you think?
I’d love to hear your feedback and ideas! Don’t hesitate to challenge my design. I’m open to suggestions, improvements, or even completely new ideas. Let’s make this pedal as versatile and powerful as possible!
Yes, I have built a working prototype of the PENDA pedal, and … it works well! Currently, I am working on a delay and a looper, but I don’t have anything presentable yet.
Philippe
Hello,
I tested the sound quality between the dry and wet (unprocessed) signals, and although the difference is subtle, it is very real! The dry signal has a bit more bass and slightly better definition.
Philippe
Oh, I’m totally with you. Why would you not have an analog dry path, its just silly to do it any other way. And it makes it super-easy to split your outputs if you’re lucky enough to be running separate wet & dry amps.
Bonsoir
I’m not sure I understand your question clearly. Are you asking about the electrical connections? If so, I’m using a 2-inch LCD Display Module with an IPS screen, 240×320 resolution (it’s not OLED). The connection order on this module is actually reversed compared to similar screens.
The connecting pins are on the left side of the screen. However, in your pedal the connecting pins are on the right side of the display. This makes me think you display image is rotated by 180 degrees, is that true?
Bonsoir
Yes, you could say the screen is rotated by 180°, but that’s really just a way of looking at it—the screen itself doesn’t have a specific “right-side up.” In my graphics library, there’s a function called setRotation(angle) that allows me to set the XY coordinate reference frame of the screen however you like.
I have just released a software framework dedicated to the PENDA Hardware platform. This framework is designed to simplify the design and manufacturing of audio effect pedals by handling both hardware aspects and the user interface.
Key Features of PENDA Software:
Comprehensive Hardware Management: Supports audio CODEC, SDRAM and QSPI memory, TFT display (ST7789), and interaction with footswitches and encoders.
Integrated User Interface: Provides advanced, configurable GUI management tailored for PENDA Hardware.
Built on STM32Cube: Utilizes a modular and extensible architecture within the STM32Cube development environment.
The goal is to allow developers to focus solely on audio signal processing, without needing to manage hardware configuration or display handling.
I would love to hear your feedback on the user experience and see the projects where PENDA Software could be used! Feel free to contact me for any questions, suggestions, or bug reports.
Just a quick update to let you know that I’ve released a new version of the PENDA Software framework, which now includes MIDI protocol support.
I’d love to hear if you’ve started exploring or developing projects using this framework—feel free to share your experiences, feedback, or suggestions.
As an early preview: I’m currently working on PENDA MKII, a stereo version of the original platform. More details coming soon!
But stick with me for a second because PENDA (Platform for Effects oN DAisy) brings a few cool twists to the table!
More info & source code: 
