From 7a66f55848d884b1f12dd939c32f8882e5693cb1 Mon Sep 17 00:00:00 2001
From: Reinout Meliesie <zedfrigg@kernelmaft.com>
Date: Sat, 23 Aug 2025 19:56:06 +0200
Subject: [PATCH] Byte-sequence version for use with kulifuli-host

---
 kulifuli-arduino.ino | 44 +++++++++++++++++++++++++-------------------
 1 file changed, 25 insertions(+), 19 deletions(-)

diff --git a/kulifuli-arduino.ino b/kulifuli-arduino.ino
index a87d8a6..e2ed9d5 100644
--- a/kulifuli-arduino.ino
+++ b/kulifuli-arduino.ino
@@ -1,6 +1,3 @@
-bool fanControlEntered = 0 ;
-
-
 void setup () {
   Serial . begin (9600) ;
 
@@ -59,26 +56,35 @@ void setup () {
 }
 
 
+// Sequence is 188 92 136 14 154 39 154 139 {duty-cycle}
+
+int seqPos = 0 ;
+
 void loop () {
   if ( Serial . available () ) {
-    if (fanControlEntered) {
-      int dutyCyclePercent = Serial . parseInt () ;
-      int dutyCycle = map ( dutyCyclePercent , 0 , 100 , 0 , 79 ) ;
-      OCR1AL = dutyCycle ;
-      OCR1BL = dutyCycle ;
-      Serial . read () ;  // Consume newline
+    int input = Serial . read () ;
 
-      Serial . print ("duty-cycle ") ;
-      Serial . print (dutyCycle) ;
-      Serial . print ('\n') ;
+    if (
+      seqPos == 0 && input == 188 ||
+      seqPos == 1 && input == 92 ||
+      seqPos == 2 && input == 136 ||
+      seqPos == 3 && input == 14 ||
+      seqPos == 4 && input == 154 ||
+      seqPos == 5 && input == 39 ||
+      seqPos == 6 && input == 154 ||
+      seqPos == 7 && input == 139
+    ) {
+      // Advance in the sequence
+      seqPos ++ ;
+    } else if ( seqPos == 8 ) {
+      // `input` is the new duty cycle
+      OCR1AL = input ;
+      OCR1BL = input ;
+      Serial . write (input) ;
+      seqPos = 0 ;
     } else {
-      String input = Serial . readString () ;
-      if ( input == "enter-fan-control" ) {
-        fanControlEntered = 1 ;
-        Serial . println ("success") ;
-      } else {
-        Serial . println ("error") ;
-      }
+      // Reset sequence progress
+      seqPos = 0 ;
     }
   }
 }