Implement safe cooldown for both fans

T11_RFID_Tutorial_Sketch/T11_RFID_Tutorial_Sketch.ino

@@ -1,4 +1,4 @@
-//#define PRINTER //uncomment for 3d-Printer (cooldown functions)
+#define PRINTER //uncomment for 3d-Printer (cooldown functions)
 
 #include <SPI.h>
 #include <LiquidCrystal.h>
@@ -6,9 +6,13 @@
 #include <MFRC522.h>
 
 #ifdef PRINTER
-  #define BTN_FANPROBE                 A3
-  #define FANOFFVALUE                  50 //adc value for fan
+  #define BTN_FANPROBE_R                 A3
+  #define BTN_FANPROBE_L                 A2
+  #define FANOFFVALUE                  512 //adc value for fan. high value = fan off
   boolean flag_switchOff = false; //set true-> loop switches output off if possible
+  #define SWITCHOFFTRYBLINKDELAY 500  //blink period time in millis
+  long lastSwitchOffTryMillis=0;
+  #define QUICKRESTARTHOLDTIME 1000 //time to hold button during fan waiting to quick restart printer
 #endif
 
 #define BTN_PIN                 A0      // lcd buttons are Voltage-Divider analog
@@ -40,6 +44,7 @@ long lastActionMillis = 0;
 
 boolean unlocked = false;
 boolean outputOn = false;
+boolean lcdbacklight = false;
 int displayLogIndex = -1;
 int displayLogIndexLast = -1;
 
@@ -130,6 +135,8 @@ void lcd_print_home() {
 void handleCards(long currentMillis) {
   if(mfrc522.PICC_IsNewCardPresent() && mfrc522.PICC_ReadCardSerial()) {
 
+    
+      
     mfrc522.PICC_HaltA();
     
     cardWasPresent = true;
@@ -141,6 +148,12 @@ void handleCards(long currentMillis) {
 
     int cardIndex = check_uid(&(mfrc522.uid));
 
+    #ifdef PRINTER
+    if (flag_switchOff && cardIndex>=0){
+      abortSwitchoff(); //abort automatic switchoff
+    }else{
+    #endif
+  
       if(cardIndex == 0) {  // card is master
         lcd.setCursor(0, 1);
         
@@ -170,11 +183,7 @@ void handleCards(long currentMillis) {
           if(outputOn) {
             #ifdef PRINTER
               if (!flag_switchOff){
-              flag_switchOff=true;
-              lcd.clear();
-              lcd.print("Wartet auf");
-              lcd.setCursor(0, 1);
-              lcd.print("Luefter");
+                flag_switchOff=true; //set flag to turn off printer
               }else{
                 flag_switchOff=false; //cancel switchoff
               }
@@ -223,17 +232,60 @@ void handleCards(long currentMillis) {
         
       }
       
+    }
+
     delay(1000);
     lcd_print_home();        
   }
 }
 
+long lastPrint=0;
+
 void loop() {
 
   long currentMillis = millis(); 
 
   handleCards(currentMillis);
 
+  #ifdef PRINTER
+    /*if (currentMillis>lastPrint+1000){ //TESTING
+      int fanvalue=analogRead(BTN_FANPROBE_R);
+      Serial.println(fanvalue);
+      lastPrint=currentMillis;
+    }*/
+    if (flag_switchOff){
+      
+      if (readButtons()!=0){ //any buttons pressed
+        long _buttonPressStart=millis();
+        while (readButtons()==1){ //select button
+          delay(100); //wait for button to release
+        }
+        
+        if (millis()-_buttonPressStart > QUICKRESTARTHOLDTIME) { //pressed button for long time
+          quickRestart();
+        }else{ //just pressed short
+          abortSwitchoff();
+        }
+        
+      }
+      if (!fanActive()){
+        set_output(false);
+        flag_switchOff=false;
+        lcd_print_home();
+      }else{ //fan is active
+        if (lastSwitchOffTryMillis+SWITCHOFFTRYBLINKDELAY < currentMillis){
+          lcd_backlight(!get_lcd_backlight()); //blink backlight
+          lcd.clear();
+          lcd.print("Wartet auf");
+          lcd.setCursor(0, 1);
+          lcd.print("Luefter");
+          lastSwitchOffTryMillis=currentMillis;
+        }
+      }
+    }
+  #endif
+
+
 
   if(readButtons() == 1 && !cardsshow) { //select button shows log, if not showing cards atm
     displayLogIndex++;
@@ -304,7 +356,7 @@ void loop() {
   }
 
   // timeout handling for returning to locked state
-  if(currentMillis - lastActionMillis > 30000) {
+  if(unlocked && currentMillis - lastActionMillis > 30000) {
     unlocked = false;
     displayLogIndex = -1;
     displayCardsIndex = -1;
@@ -316,28 +368,14 @@ void loop() {
       lcd_print_home();
     }
   }
-
-  #ifdef PRINTER
-    int fanvalue=analogRead(BTN_FANPROBE);
-    Serial.println(fanvalue);
-    if (flag_switchOff){
-      if (readButtons()!=0){ //any buttons pressed
-        abortSwitchoff();
-      }
-      if (!fanActive()){
-        set_output(false);
-        flag_switchOff=false;
-      }
-    }
-  #endif
 }
 
 #ifdef PRINTER
 bool fanActive()
 {
-  int fanvalue=analogRead(BTN_FANPROBE);
-  Serial.println(fanvalue);
-  if (fanvalue<FANOFFVALUE){
+  int fanvalue_r=analogRead(BTN_FANPROBE_R);
+  int fanvalue_l=analogRead(BTN_FANPROBE_L);
+  if (fanvalue_l>FANOFFVALUE && fanvalue_r>FANOFFVALUE){ //fan value high = fan off
     return false;
   }else{
     return true;
@@ -345,11 +383,27 @@ bool fanActive()
 }
 
 void abortSwitchoff(){
+  lcd_backlight(true);
+  if (flag_switchOff){
     flag_switchOff=false;
     lcd.clear();
     lcd.print("Ausschalten");
     lcd.setCursor(0, 1);
     lcd.print("Abgebrochen");
+    delay(500);
+  }
+}
+
+void quickRestart(){
+  lcd_backlight(true);
+  flag_switchOff=false;
+  lcd.clear();
+  lcd.print("SCHNELLER");
+  lcd.setCursor(0, 1);
+  lcd.print("NEUSTART");
+  set_output(false);
+  delay(500);
+  set_output(true);
 }
 #endif
 

T11_RFID_Tutorial_Sketch/functions.ino

@@ -30,12 +30,18 @@ void set_output(boolean on) {
 // switch the LDC Backlight on/off
 void lcd_backlight(boolean on) {
   if(on) {
+    lcdbacklight=true;
     digitalWrite(LCD_BACKLIGHT, HIGH);
   } else {
+    lcdbacklight=false;
     digitalWrite(LCD_BACKLIGHT, LOW);
   }
 }
 
+bool get_lcd_backlight(){
+  return lcdbacklight;
+}
+
 // print a Mifare UID at current LDC position
 void lcd_print_uid(MFRC522::Uid *uid) {
   for (byte i=0; i < uid->size; i++) {