commit 414fbb94f37679308d3e93a6be3079ca71df9c31
Author: Michael Sippel <micha@fragmental.art>
Date:   Thu Nov 28 18:47:30 2024 +0100

    initial commit

diff --git a/pedalboard-footswitch.ino b/pedalboard-footswitch.ino
new file mode 100644
index 0000000..d179479
--- /dev/null
+++ b/pedalboard-footswitch.ino
@@ -0,0 +1,111 @@
+#define SEL_A_IN    D2
+#define SEL_A_LED   D3
+#define SEL_B_IN    D4
+#define SEL_B_LED   D5
+#define SEL_C_IN    D6
+#define SEL_C_LED   D7
+#define SEL_D_IN    D8
+#define SEL_D_LED   D9
+
+#define SUST_IN     D10
+#define EXPR_IN     A0
+
+void setup() {
+  pinMode( SEL_A_IN, INPUT_PULLUP );
+  pinMode( SEL_A_LED, OUTPUT );
+  pinMode( SEL_B_IN, INPUT_PULLUP );
+  pinMode( SEL_B_LED, OUTPUT );
+  pinMode( SEL_C_IN, INPUT_PULLUP );
+  pinMode( SEL_C_LED, OUTPUT );
+  pinMode( SEL_D_IN, INPUT_PULLUP );
+  pinMode( SEL_D_LED, OUTPUT );
+
+  pinMode( SUST_IN, INPUT_PULLUP );
+  pinMode( EXPR_IN, INPUT_PULLUP );
+
+  Serial.begin(31250);
+}
+
+int last_expr_val = 0;
+int last_sust_val = 0;
+
+#define NOTE_OFF       0x8
+#define NOTE_ON        0x9
+#define AFTERTOUCH     0xA
+#define CONTROL_CHANGE 0xB
+#define PATCH_CHANGE   0xC
+#define CHANNEL_PRESSURE 0xD
+#define PITCH_BEND     0xE
+#define OTHER          0xF
+
+//send MIDI message
+void MIDImessage(int cmd_id, int data1, int data2) {
+  int channel = 0;
+  int cmd_byte = (cmd_id << 4) | (channel & 0xf);
+  Serial.write(cmd_byte);//send command byte
+  Serial.write(data1);//send data byte #1
+  Serial.write(data2);//send data byte #2
+}
+
+void loop() {
+  delay(100);
+
+  if( digitalRead( SUST_IN ) == LOW ) {
+    if( last_sust_val != 1 ) {
+      last_sust_val = 1;
+      MIDImessage( CONTROL_CHANGE, 0x42, 0x7f );
+    }
+  } else {
+    if( last_sust_val != 0 ) {
+      last_sust_val = 0;
+      MIDImessage( CONTROL_CHANGE, 0x42, 0x00 );
+    }
+  }
+
+  int expr_val = analogRead( EXPR_IN );
+  if( expr_val != last_expr_val )
+  {
+    last_expr_val = expr_val;
+
+    float expr_val_f = (float)(expr_val - 66) / 590.0;
+    if( expr_val_f < 0.0 ){
+      expr_val_f = 0.0;
+    }
+    if( expr_val_f > 1.0 ){
+      expr_val_f = 1.0;
+    }
+
+    int val_b = (int)(expr_val_f * 128.0);
+
+    MIDImessage( CONTROL_CHANGE, 0x0b, val_b );
+  }
+
+  if( digitalRead( SEL_A_IN ) == LOW ) {
+    MIDImessage( PATCH_CHANGE, 0x0, 0x0 );
+    digitalWrite( SEL_A_LED, HIGH );
+    digitalWrite( SEL_B_LED, LOW );
+    digitalWrite( SEL_C_LED, LOW );
+    digitalWrite( SEL_D_LED, LOW );
+  }
+  if( digitalRead( SEL_B_IN ) == LOW ) {
+    MIDImessage( PATCH_CHANGE, 0x1, 0x1 );
+    digitalWrite( SEL_A_LED, LOW );
+    digitalWrite( SEL_B_LED, HIGH );
+    digitalWrite( SEL_C_LED, LOW );
+    digitalWrite( SEL_D_LED, LOW );
+  }
+  if( digitalRead( SEL_C_IN ) == LOW ) {
+    MIDImessage( PATCH_CHANGE, 0x2, 0x2 );
+    digitalWrite( SEL_A_LED, LOW );
+    digitalWrite( SEL_B_LED, LOW );
+    digitalWrite( SEL_C_LED, HIGH );
+    digitalWrite( SEL_D_LED, LOW );
+  }
+  if( digitalRead( SEL_D_IN ) == LOW ) {
+    MIDImessage( PATCH_CHANGE, 0x3, 0x3 );
+    digitalWrite( SEL_A_LED, LOW );
+    digitalWrite( SEL_B_LED, LOW );
+    digitalWrite( SEL_C_LED, LOW );
+    digitalWrite( SEL_D_LED, HIGH );
+  }
+}