From 7dd00036172fac5ea32867f0c6fa986767a95ed5 Mon Sep 17 00:00:00 2001
From: stefanbode <stefan_bode@web.de>
Date: Thu, 24 Nov 2022 09:37:07 +0100
Subject: [PATCH] Update AC-Dimmer power calculation

Power on AC-Dimmer is based on integral over the sinus. Implement mapping table to get a more linear power behavior.
---
 .../xdrv_04_light_utils.ino                    | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/tasmota/tasmota_xdrv_driver/xdrv_04_light_utils.ino b/tasmota/tasmota_xdrv_driver/xdrv_04_light_utils.ino
index dffc12019..ebe69a08f 100644
--- a/tasmota/tasmota_xdrv_driver/xdrv_04_light_utils.ino
+++ b/tasmota/tasmota_xdrv_driver/xdrv_04_light_utils.ino
@@ -31,6 +31,17 @@ typedef struct gamma_table_t {
   uint16_t to_gamma;
 } gamma_table_t;
 
+const gamma_table_t ac_dimmer_table[] = {   // don't put in PROGMEM for performance reasons
+  {    0,      0 },
+  {    5,    144 },
+  {   10,    205 },
+  {   50,    500 },
+  {   90,    795 },
+  {   95,    866 },
+  {  100,   1000 },
+  { 0xFFFF, 0xFFFF }          // fail-safe if out of range
+};
+
 const gamma_table_t gamma_table[] = {   // don't put in PROGMEM for performance reasons
   {    1,      1 },
   {    4,      1 },
@@ -318,6 +329,11 @@ uint16_t ledGammaReverse_internal(uint16_t vg, const struct gamma_table_t *gt_pt
   }
 }
 
+// 10 bits power select to 10 bits timing based on sinus curve
+uint16_t ac_zero_cross_power(uint16_t v) {
+  return ledGamma_internal(v, ac_dimmer_table)/10;
+}
+
 // 10 bits in, 10 bits out
 uint16_t ledGamma10_10(uint16_t v) {
   return ledGamma_internal(v, gamma_table);
@@ -345,4 +361,4 @@ uint16_t ledGammaFast(uint16_t v) {
 
 uint16_t leddGammaReverseFast(uint16_t vg) {
   return ledGammaReverse_internal(vg, gamma_table_fast);
-}
\ No newline at end of file
+}