pianoled's Introduction

Piano MIDI LED Controller

Summary

This is a ESP8266 based LED controller for key instruments. It can be used as a cool gadget when playing piano or as a piano learning tool when connected to Synthesia that can light up correct keys.

Demo

Features

up to 2 selectable MIDI inputs
up to 176 RGB WS2812 LED (2 LED per key)
automatic standby mode (5 animations available in UI)
velocity based mode (color depend on key velocity)
3 non velocity modes
special effect for Frozen
ripple effect
included web IDE for lua code
rboot for easy firmware upgrades using web IDE

Source code

NodeMCU ANSI C code is included in NodeMCU code .

Assembly

Requirements

ESP8266 module with qio and at least 4MB of flash.

Hardware

The MIDI inputs are compatible with TTL logic signal. To connect standard MIDI you will need to use circuit to create TTL signal (e.g. using optocoupler). 2 meters of 144 LED WS2812 strip almost perfectly matches standard piano keyboard, to make it match perfectly you can cut the strip into octaves (24 LEDs) and solder it using correct distance.

Firmware

Download and flash firmware MIDI firmware
Upload lua and supporting code from directory src/nodemcu/ see: https://nodemcu.readthedocs.io/en/master/en/upload/

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pianoled's Issues

midi cable

hi.
my piano have usb midi interface, not 5 din midi like the picture below.

is it impossible to use this piano???

or is there any way to change 5din to usb in your scheme?

Problem with flashing

Hello. I'm using NodeMCU, ESP-12E. Tried to flash firmware to 0x12000. Rboot easily starts, but it can't see ROM. I've tried to flash eagle.app.bin to 0x2000 (or 0x02000), what is described in readme of rboot sources, but it still do not work. What should I do with this for correct working?

J1 connection pinouts

What are the inputs to J1 (MIDI Inputs) on hardware schematic?

In the html.index code it has using Piano and Synthesia inputs selection. Is the raw midi input from digital piano by midi-out (5 din connector) and/or USB midi output from PC/laptop/tablet for Synthesia are used?

From what I can tell, serial USB and serial MIDI are two different format and baud rates. However, the schematic shows both pins of J2 (1,3) going into the opt-couplers, to shit the levels to TTL, then directly to the GPIO inputs on MC.

Can you please provide the pin outs and maybe a brief explanation of how the physical connections are laid out.

Thank you!

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