From 25c01716f5ba548ad8c8339fd6965f0b6e7ba6bb Mon Sep 17 00:00:00 2001
From: "Adrian A. Baumann" <ade@adebaumann.com>
Date: Tue, 14 Apr 2026 13:41:23 +0200
Subject: [PATCH] LED now accepts ranges

---
 Gaugecontroller/Gaugecontroller.ino | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/Gaugecontroller/Gaugecontroller.ino b/Gaugecontroller/Gaugecontroller.ino
index 55b6407..139c3aa 100644
--- a/Gaugecontroller/Gaugecontroller.ino
+++ b/Gaugecontroller/Gaugecontroller.ino
@@ -520,13 +520,19 @@ bool parseLedQuery(const String& line) {
 }
 
 bool parseLed(const String& line) {
-  int id, idx, r, g, b;
-  if (sscanf(line.c_str(), "LED %d %d %d %d %d", &id, &idx, &r, &g, &b) == 5) {
+  int id, r, g, b;
+  char idxToken[16];
+  if (sscanf(line.c_str(), "LED %d %15s %d %d %d", &id, idxToken, &r, &g, &b) == 5) {
     if (id < 0 || id >= GAUGE_COUNT) { sendReply("ERR BAD_ID"); return true; }
-    if (idx < 0 || idx >= gaugePins[id].ledCount) { sendReply("ERR BAD_IDX"); return true; }
-    leds[gaugeLedOffset[id] + idx] = CRGB(constrain(r, 0, 255),
-                                          constrain(g, 0, 255),
-                                          constrain(b, 0, 255));
+    char* dash = strchr(idxToken, '-');
+    int idxFirst = atoi(idxToken);
+    int idxLast  = dash ? atoi(dash + 1) : idxFirst;
+    if (idxFirst < 0 || idxLast >= gaugePins[id].ledCount || idxFirst > idxLast) {
+      sendReply("ERR BAD_IDX"); return true;
+    }
+    CRGB color(constrain(r, 0, 255), constrain(g, 0, 255), constrain(b, 0, 255));
+    for (int i = idxFirst; i <= idxLast; i++)
+      leds[gaugeLedOffset[id] + i] = color;
     FastLED.show();
     sendReply("OK");
     return true;