From f853bd1c30506f25a9999bb42fb2747e35ea12bc Mon Sep 17 00:00:00 2001
From: Tizian Haider <tizian.franz.haider@stud.fh-campuswien.ac.at>
Date: Sun, 17 May 2026 16:27:15 +0200
Subject: [PATCH] add global values for per-sensor calibration table;

---
 esphome_b4_controller.yaml | 61 ++++++++++++++++++++++++++++++--------
 1 file changed, 49 insertions(+), 12 deletions(-)

diff --git a/esphome_b4_controller.yaml b/esphome_b4_controller.yaml
index dd28a15..c9394da 100644
--- a/esphome_b4_controller.yaml
+++ b/esphome_b4_controller.yaml
@@ -49,6 +49,43 @@ ads1115:
     i2c_id: bus_ads
     address: 0x48
 
+globals:
+  - id: hb1_wet_voltage
+    type: float
+    restore_value: yes
+    initial_value: '1.20'
+  - id: hb1_dry_voltage
+    type: float
+    restore_value: yes
+    initial_value: '2.70'
+
+  - id: hb2_wet_voltage
+    type: float
+    restore_value: yes
+    initial_value: '1.20'
+  - id: hb2_dry_voltage
+    type: float
+    restore_value: yes
+    initial_value: '2.70'
+
+  - id: hb3_wet_voltage
+    type: float
+    restore_value: yes
+    initial_value: '1.20'
+  - id: hb3_dry_voltage
+    type: float
+    restore_value: yes
+    initial_value: '2.70'
+
+  - id: hb4_wet_voltage
+    type: float
+    restore_value: yes
+    initial_value: '1.20'
+  - id: hb4_dry_voltage
+    type: float
+    restore_value: yes
+    initial_value: '2.70'
+
 switch:
   - platform: gpio
     name: "Bewässerung Hochbeet 1"
@@ -206,10 +243,10 @@ sensor:
     update_interval: 2s
     icon: "mdi:water-percent"
     lambda: |-
-      const float wet_voltage = 1.20;
-      const float dry_voltage = 2.70;
+      float wet_voltage = id(hb1_wet_voltage);
+      float dry_voltage = id(hb1_dry_voltage);
       float v = id(b4_sensor1).state;
-      if (isnan(v)) return NAN;
+      if (isnan(v) || dry_voltage <= wet_voltage) return NAN;
       float p = (dry_voltage - v) * 100.0f / (dry_voltage - wet_voltage);
       if (p < 0) p = 0;
       if (p > 100) p = 100;
@@ -225,10 +262,10 @@ sensor:
     update_interval: 2s
     icon: "mdi:water-percent"
     lambda: |-
-      const float wet_voltage = 1.20;
-      const float dry_voltage = 2.70;
+      float wet_voltage = id(hb2_wet_voltage);
+      float dry_voltage = id(hb2_dry_voltage);
       float v = id(b4_sensor2).state;
-      if (isnan(v)) return NAN;
+      if (isnan(v) || dry_voltage <= wet_voltage) return NAN;
       float p = (dry_voltage - v) * 100.0f / (dry_voltage - wet_voltage);
       if (p < 0) p = 0;
       if (p > 100) p = 100;
@@ -244,10 +281,10 @@ sensor:
     update_interval: 2s
     icon: "mdi:water-percent"
     lambda: |-
-      const float wet_voltage = 1.20;
-      const float dry_voltage = 2.70;
+      float wet_voltage = id(hb3_wet_voltage);
+      float dry_voltage = id(hb3_dry_voltage);
       float v = id(b4_sensor3).state;
-      if (isnan(v)) return NAN;
+      if (isnan(v) || dry_voltage <= wet_voltage) return NAN;
       float p = (dry_voltage - v) * 100.0f / (dry_voltage - wet_voltage);
       if (p < 0) p = 0;
       if (p > 100) p = 100;
@@ -263,10 +300,10 @@ sensor:
     update_interval: 2s
     icon: "mdi:water-percent"
     lambda: |-
-      const float wet_voltage = 1.20;
-      const float dry_voltage = 2.70;
+      float wet_voltage = id(hb4_wet_voltage);
+      float dry_voltage = id(hb4_dry_voltage);
       float v = id(b4_sensor4).state;
-      if (isnan(v)) return NAN;
+      if (isnan(v) || dry_voltage <= wet_voltage) return NAN;
       float p = (dry_voltage - v) * 100.0f / (dry_voltage - wet_voltage);
       if (p < 0) p = 0;
       if (p > 100) p = 100;