Appendix F: Volume Knob Patch

A pre-compiled UF2 file to use the Knob as a volume controller is included in the firmwares directory of the Github repository.

If you'd like to build your own, here's a patch you can apply to the code to get you started:

diff --git a/keyboards/ploopyco/knob/config.h b/keyboards/ploopyco/knob/config.h
index 9b7d9f5c1a..92d97584cc 100644
--- a/keyboards/ploopyco/knob/config.h
+++ b/keyboards/ploopyco/knob/config.h
@@ -16,7 +16,7 @@

 #pragma once

-#define POINTING_DEVICE_HIRES_SCROLL_ENABLE 0
+// #define POINTING_DEVICE_HIRES_SCROLL_ENABLE 0
 #define POINTING_DEVICE_AS5600_ENABLE true

 #define I2C_DRIVER I2CD1
diff --git a/keyboards/ploopyco/ploopyco.c b/keyboards/ploopyco/ploopyco.c
index 72fad42aba..24428a73c3 100644
--- a/keyboards/ploopyco/ploopyco.c
+++ b/keyboards/ploopyco/ploopyco.c
@@ -180,23 +180,12 @@ report_mouse_t pointing_device_task_kb(report_mouse_t mouse_report) {
         delta += 4096;
     }

-    if (detected_host_os() == OS_WINDOWS || detected_host_os() == OS_LINUX) {
-        // Establish a deadzone to prevent spurious inputs
-        if (delta > POINTING_DEVICE_AS5600_DEADZONE || delta < -POINTING_DEVICE_AS5600_DEADZONE) {
-            current_position = ra;
-            mouse_report.v = delta / POINTING_DEVICE_AS5600_SPEED_DIV;
-        }
-    } else {
-        // Certain operating systems, like MacOS, don't play well with the
-        // high-res scrolling implementation. For more details, see:
-        // https://github.com/qmk/qmk_firmware/issues/17585#issuecomment-2325248167
-        if (delta >= POINTING_DEVICE_AS5600_TICK_COUNT) {
-            current_position = ra;
-            mouse_report.v = 1;
-        } else if (delta <= -POINTING_DEVICE_AS5600_TICK_COUNT) {
-            current_position = ra;
-            mouse_report.v = -1;
-        }
+    if (delta >= POINTING_DEVICE_AS5600_TICK_COUNT) {
+        current_position = ra;
+        tap_code(KC_VOLD);
+    } else if (delta <= -POINTING_DEVICE_AS5600_TICK_COUNT) {
+        current_position = ra;
+        tap_code(KC_VOLU);
     }
 #endif

Happy coding!