Encoders with LED rings #379
EvgeniySavkin
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Replies: 1 comment 20 replies
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First of all, your DAW has to support relative control change MIDI control messages. Try out the RotaryEncoder example first, before spending any time on getting the LEDs to work. If that works, you need some code to receive the knob position from the DAW. You rely on the DAW sending this information, if it doesn't, you're out of luck (maybe you can write some custom controller scripts if the DAW allows this). If you want to write to the LEDs yourself, you can use the CCValue class, see this example: Pitch-Bend-Value I've linked to the documentation for the |
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Thanks! |
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@tttapa Hello, Peter, once again!!! With your help and huge support, it turned out to be a wonderful controller. I suggest in a future release to add my sketch for managing the Behringer XR18: I got a sincere pleasure and a lot of knowledge communicating with you, working on the code. Thank you. p.s.:Since I don't know much programming and English, please read the comments in the code carefully. I could have made a lot of mistakes. |
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Thanks for sharing! |
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Piter Hi!!! I probably ask a lot of questions in one branch, but I am very interested in your project!!))) And how to configure Bankable::CCAbsoluteEncoder to MCP23017??? Or is it not supported??? |
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It is supported, most of what you need is there, you just have to combine the right classes. You could try something like this (untested): #include <Control_Surface.h>
#include <AH/Hardware/MCP23017Encoders.hpp>
#include <Wire.h>
// <<<<<<<<<<<<<<<<
// Type for the MCP23017 encoders (translates encoder pulses to position)
using WireType = decltype(Wire); // The type of I²C driver to use
using EncoderPositionType = int32_t; // The type for saving encoder positions
constexpr bool IntSafe = true; // Make it safe to call `update` in an ISR
using MCPEncoderType = MCP23017Encoders<WireType, EncoderPositionType, IntSafe>;
// Type for the MIDI encoders (translates position to MIDI messages)
template <uint8_t NumBanks>
using MCPCCAbsEncType = Bankable::GenericMIDIAbsoluteEncoder<MCPEncoderType::MCP23017Encoder, // Encoder type
NumBanks, Bankable::SingleAddress, // Bank size and behavior
ContinuousCCSender>; // MIDI output
// Wrapper for consistency with the standard Bankable::CCAbsoluteEncoder interface
template <uint8_t NumBanks>
struct MCPBankableCCAbsoluteEncoder : MCPCCAbsEncType<NumBanks> {
MCPBankableCCAbsoluteEncoder(BankConfig<NumBanks> config, MCPEncoderType::MCP23017Encoder enc,
MIDIAddress address, int16_t multiplier = 1, uint8_t pulsesPerStep = 4)
: MCPCCAbsEncType<NumBanks>({config, address}, std::move(enc), multiplier, pulsesPerStep, {}) {}
};
// >>>>>>>>>>>>>>>>
USBDebugMIDI_Interface midi;
const uint8_t interrupt_pin = 12;
Bank<2> bank(8); //two banks of eight encoders/buttons/LedMutes/LedRings each
// Create an object that manages the 8 encoders connected to the MCP23017.
MCPEncoderType enc = {Wire, 0x0, interrupt_pin};
// │ │ └─ Interrupt pin
// │ └────── Address offset
// └──────────── I²C interface
// Instantiate 8 MIDI rotary encoders.
MCPBankableCCAbsoluteEncoder<2> ccencoders[] = {
{
{bank, BankType::CHANGE_ADDRESS}, // bank configuration
enc[0], // The encoder to use
MCU::V_POT_1, // The MIDI address
1, // Encoder speed multiplier
4, // Number of pulses per physical "click" of the encoder
},
{bank, enc[1], MCU::V_POT_2}, // (BankType::CHANGE_ADDRESS is the default)
{bank, enc[2], MCU::V_POT_3},
{bank, enc[3], MCU::V_POT_4},
{bank, enc[4], MCU::V_POT_5},
{bank, enc[5], MCU::V_POT_6},
{bank, enc[6], MCU::V_POT_7},
{bank, enc[7], MCU::V_POT_8},
};
void isr() {
enc.update(); // Read the state of the encoders and update the positions
}
void setup() {
Control_Surface.begin();
Wire.begin(); // Must be called before enc.begin()
Wire.setClock(800000);
enc.begin(); // Initialize the MCP23017
attachInterrupt(digitalPinToInterrupt(interrupt_pin), isr, LOW);
}
void loop() {
// No `enc.update()` here, updating the encoders happens inside of the ISR
Control_Surface.loop();
} |
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Hi Peter! I am a novice Arduino user. I can't find a solution for LED rings tied to encoders. Please help me. Arduino 2560 board, the LEDs are connected to the 74HC595 shift register. The LED rings should display the channel volume position in the DAW. At the same time, the controller has two banks of 8 channels. Below I attach a working sketch in which I want to replace the ССpotentiometers with encoders:
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