Control Surface library - LED example help

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1

I hoping someone with experience with the Control Surface library can help me with this hopefully simple issue. I am attempting to modify the Note_Range_LEDs example from the Control Surface library from an 8 note range to 16. I've wired up a second shift register and updated the code. See the schematic and code below.

The results I am currently seeing is that only LED1 lights up on all notes. The other LED's never light.

I also also trying to move the first note from C4 to C1 with no luck.

Any assistance would be amazing!

led_schematic
led_schematic1523×721 11.8 KB

#include <Control_Surface.h>

// Instantiate a MIDI Interface to use
USBMIDI_Interface midi;

// Instantiate a shift register as output for the LEDs/Gates
SPIShiftRegisterOut<16> sreg {
  SPI,      // SPI interface to use
  10,       // Latch pin (ST_CP)
  MSBFIRST, // Byte order
};

// Extended note range to 16 and moved first note to C1
NoteRangeLEDs<16> leds {sreg.pins(), MIDI_Notes::C[1]};

void setup() {
  Control_Surface.begin();
}

void loop() {
  Control_Surface.loop();
}
2

The wiring is incorrect: Q̅H of the first chip should go to the serial input of the second. The storage register clock/latch of both chips should be connected to Arduino pin 10 directly.

Try debugging the hardware first, without MIDI. Try e.g. Control Surface: 1.SPI-Blink.ino

3

Thanks for the reply Pieter. My schematic drawing is incorrect but the wiring on my breadboard is correct. I went to a single shift register and the original example sketch for testing. It turns out that C3 is the first note even though C[4] is set in the code. Odd.

I also setup the second shift register again and modified the code for 16 outputs. The 16 outputs are working but C3 continues to be the same first note. Any idea why? I'm using a Pro Micro.

4

This is down to the convention used by whatever software you're using. Control Surface uses Scientific Pitch Notation, see
Control Surface: MIDI_Notes Namespace Reference.