From 1186fc9f8c6f1554ca4e6f9b51946c71893cd21d Mon Sep 17 00:00:00 2001
From: Denis Denisov <ftc.denis@gmail.com>
Date: Sat, 14 Dec 2024 09:32:48 +0300
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---
 defrost_v3.ino | 87 ++++++++++++++++++++++++++++++++++----------------
 1 file changed, 59 insertions(+), 28 deletions(-)

diff --git a/defrost_v3.ino b/defrost_v3.ino
index 2a7f178..8d77d3e 100644
--- a/defrost_v3.ino
+++ b/defrost_v3.ino
@@ -1,7 +1,12 @@
+#include <OneWire.h>
+#include <DallasTemperature.h>
 #include <ESP8266WiFi.h>
 #include <ModbusIP_ESP8266.h>
 #include "config.h"
+#include "LittleFS.h"
 
+#define RELAY_PIN D2
+#define TEMP_SENSOR_PIN D5
 // network
 // After how much time without connection we will 
 // reboot (in millis)
@@ -15,7 +20,7 @@ IPAddress subnet(MY_NET);
 // modbus consts and works
 #define TCP_PORT 15000
 #define POLL_INTERVAL 10000
-#define T_UPDATE_INTERVAL 500
+#define T_UPDATE_INTERVAL 2000
 
 #define MODE_AUTO 0
 #define MODE_MANUAL 1
@@ -28,6 +33,8 @@ IPAddress subnet(MY_NET);
 #define REGISTER_SECONDARY_TEMP 5
 
 ModbusIP mb;
+OneWire oneWire(TEMP_SENSOR_PIN);
+DallasTemperature sensor(&oneWire);
 
 char id[64];
 
@@ -40,9 +47,51 @@ int cur_mode = MODE_AUTO;
 int cur_t = 0;
 int cur_state = 0;
 
+bool TryLoad(char *filename)
+{
+  File f = LittleFS.open(filename, "r");
+	if (!f) return false;
+	String s = f.readStringUntil('\n');
+	t_on = atoi(s.c_str());
+  s = f.readStringUntil('\n');
+	t_off = atoi(s.c_str());
+  f.close();
+  if (t_on == 0) return false;
+	return true;
+}
+
+void LoadState()
+{
+  if (TryLoad("/settings.txt")) return;
+  TryLoad("/settings.txt.bak");
+}
+
+void SaveTo(char *filename)
+{
+  File f = LittleFS.open(filename, "w");
+	if (!f) return;
+	f.println(t_on);
+  f.println(t_off);
+	f.close();
+}
+
+void SaveState()
+{
+  SaveTo("/settings.txt");
+	SaveTo("/settings.txt.bak");
+}
+
+
 void setup() 
 {
-	pinMode(D2, OUTPUT);
+	if (!LittleFS.begin())
+	{
+		Serial.println("Unable to mount the filesystem");
+		ESP.restart();
+	}
+	LoadState();
+	pinMode(RELAY_PIN, OUTPUT);
+  pinMode(TEMP_SENSOR_PIN, INPUT);
 	Serial.begin(115200);
 	Serial.println("Initialised...");
 
@@ -67,35 +116,15 @@ void setup()
 	mb.addHreg(REGISTER_CUR_TEMP, cur_t);
 	mb.addHreg(REGISTER_CUR_STATE, cur_state);
 	mb.addHreg(REGISTER_SECONDARY_TEMP, cur_t);
+  //
+  sensor.begin();
+  sensor.setResolution(12);
+  sensor.requestTemperatures();
 }
 
-// thermistor 
-#define THERMISTORPIN A0
-#define THERMISTORNOMINAL 10000
-#define TEMPERATURENOMINAL 25
-#define NUMSAMPLES 5
-#define BCOEFFICIENT 3950
-#define SERIESRESISTOR 10000
-
 void UpdateCurrent()
 {
-	float average = 0;
-	for (int i = 0; i < NUMSAMPLES; i++) 
-	{
-		average += analogRead(THERMISTORPIN);
-		delay(10);
-	}
-	average /= NUMSAMPLES;
-	average = 1023 / average - 1;
-	average = SERIESRESISTOR / average;
-	float steinhart;
-	steinhart = average / THERMISTORNOMINAL; // (R/Ro)
-	steinhart = log(steinhart); // ln(R/Ro)
-	steinhart /= BCOEFFICIENT; // 1/B * ln(R/Ro)
-	steinhart += 1.0 / (TEMPERATURENOMINAL + 273.15); // + (1/To)
-	steinhart = 1.0 / steinhart; // инвертируем
-	steinhart -= 273.15; // конвертируем в градусы по Цельсию
-	cur_t = int(steinhart * 100);
+	cur_t = int(sensor.getTempCByIndex(0) * 100);
 	last_update = millis();
 }
 
@@ -125,9 +154,10 @@ void loop()
 	{
 		cur_state = mb.Hreg(REGISTER_CUR_STATE);
 	}
-	digitalWrite(D2, cur_state);
+	digitalWrite(RELAY_PIN, cur_state);
 	if (u) 
 	{
+    SaveState();
 		Serial.println("Cur state");
 		Serial.println(cur_state);
     Serial.println(cur_t);
@@ -151,6 +181,7 @@ void loop()
 	}
 	if (current < last_connected || current - last_connected > NON_CONNECTED_REBOOT_TIMEOUT)
 	{
+    SaveState();
 		ESP.restart();
 	}
 }