From f8629586f863c45aa032bc9f96f5732871106833 Mon Sep 17 00:00:00 2001
From: Ollo <Ollo@host>
Date: Sat, 24 Feb 2024 16:21:39 +0100
Subject: [PATCH] Calculate water percentage below 30 percent

---
 esp32/src/main.cpp | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/esp32/src/main.cpp b/esp32/src/main.cpp
index e58c320..93718e0 100644
--- a/esp32/src/main.cpp
+++ b/esp32/src/main.cpp
@@ -1067,9 +1067,21 @@ void plantcontrol()
       if (!isnan(waterRawSensor.getAverage()))
       {
         /* measuring the distance from top -> smaller value means more water: */
-        sensorWater.setProperty("remaining").send(String(100.0 * (waterRawSensor.getAverage()/ESP_ADC_MAX)));
+        long averageWater = waterRawSensor.getAverage();
+        if (averageWater < ESP_ADC_MAX) {
+          long percentage = (averageWater * averageWater);
+          percentage = percentage / 570000;
+          /* Add offset */
+          if (percentage > 0)
+          {
+            percentage += 4;
+          }
+          sensorWater.setProperty("remaining").send(String(percentage));
+        } else {
+          sensorWater.setProperty("remaining").send(String("100"));
+        }
 
-        sensorWater.setProperty("distance").send(String(waterRawSensor.getAverage()));
+        sensorWater.setProperty("raw").send(String(waterRawSensor.getAverage()));
       }
     }
     sensorLipo.setProperty("percent").send(String(100 * mBatteryVoltage / VOLT_MAX_BATT));