From 937f7f09e72576aac40fa7a1b7f8414412a88000 Mon Sep 17 00:00:00 2001
From: bartschdo76253 <bartschdo76253@th-nuernberg.de>
Date: Sun, 25 Jul 2021 17:05:14 +0200
Subject: [PATCH] new ldr algo

---
 lib/treppe/treppe.cpp | 7 ++++++-
 lib/treppe/treppe.h   | 2 +-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/lib/treppe/treppe.cpp b/lib/treppe/treppe.cpp
index 7c14393..00bc5e1 100644
--- a/lib/treppe/treppe.cpp
+++ b/lib/treppe/treppe.cpp
@@ -169,8 +169,13 @@ float Treppe::read_ldr() {
   E(LDR) = 6526.5 / (R(LDR)^2)
   ldr_value = E(LDR)
   */
-  float ldr_ohm = 37280.00 / analogRead(A0);
+  //float ldr_ohm = 37280.00 / analogRead(A0);
+  float voltage = analogRead(A0)*0.0036;
+  float ldr_ohm = 40.57*(3.3-voltage)/voltage;
   float ldr_value = 6526.6 / (ldr_ohm * ldr_ohm);
+  #ifdef LDRDEBUG
+  Serial.printf("Ohm: %f lux: %f\n", ldr_ohm,ldr_value);
+  #endif
   return ldr_value;
 }
 
diff --git a/lib/treppe/treppe.h b/lib/treppe/treppe.h
index ce88dbe..32bd14a 100644
--- a/lib/treppe/treppe.h
+++ b/lib/treppe/treppe.h
@@ -6,7 +6,7 @@
 #include <EEPROM.h>
 
 // #define LDRDEBUG  // comment in to override LDR measurement
-#define LDR_HYS 1 // Hysteresis for switching off FSM [lux]
+#define LDR_HYS 5 // Hysteresis for switching off FSM [lux]
 
 #define SENSOR_OBEN 16
 #define SENSOR_UNTEN 12