commit ddb24de04ab1c880210a3203119657bc24bcc97f
Author: NilsGrunwald <nilsgrunwald@msn.com>
Date:   Tue Dec 14 18:34:54 2021 +0100

    initial checkin

diff --git a/UARTBridge3dDrucker.ino b/UARTBridge3dDrucker.ino
new file mode 100644
index 0000000..19a2af6
--- /dev/null
+++ b/UARTBridge3dDrucker.ino
@@ -0,0 +1,178 @@
+/*
+  Blink
+
+  Turns an LED on for one second, then off for one second, repeatedly.
+
+  Most Arduinos have an on-board LED you can control. On the UNO, MEGA and ZERO
+  it is attached to digital pin 13, on MKR1000 on pin 6. LED_BUILTIN is set to
+  the correct LED pin independent of which board is used.
+  If you want to know what pin the on-board LED is connected to on your Arduino
+  model, check the Technical Specs of your board at:
+  https://www.arduino.cc/en/Main/Products
+
+  modified 8 May 2014
+  by Scott Fitzgerald
+  modified 2 Sep 2016
+  by Arturo Guadalupi
+  modified 8 Sep 2016
+  by Colby Newman
+
+  This example code is in the public domain.
+
+  http://www.arduino.cc/en/Tutorial/Blink
+*/
+
+#define RELAY1 2
+#define RELAY2 3
+#define RELAY3 4
+#define RELAY4 5
+unsigned int relay[4] = { RELAY1, RELAY2, RELAY3, RELAY4 };
+
+#define BUTTON1 6
+#define BUTTON2 7
+#define BUTTON3 8
+#define BUTTON4 9
+unsigned int button[4] = { BUTTON1, BUTTON2, BUTTON3, BUTTON4 };
+
+#define OPTO1 10
+
+
+boolean relayState[4];
+boolean buttonState[4];
+boolean buttonLastState[4];
+boolean buttonPressed[4];
+boolean optoState;
+
+
+  
+String inString;
+
+// the setup function runs once when you press reset or power the board
+void setup() {
+  // initialize digital pin LED_BUILTIN as an output.
+  pinMode(LED_BUILTIN, OUTPUT);
+  
+  pinMode(RELAY1, OUTPUT);
+  pinMode(RELAY2, OUTPUT);
+  pinMode(RELAY3, OUTPUT);
+  pinMode(RELAY4, OUTPUT);
+  
+  pinMode(OPTO1, OUTPUT);
+  
+  pinMode(BUTTON1, INPUT_PULLUP);
+  pinMode(BUTTON2, INPUT_PULLUP);
+  pinMode(BUTTON3, INPUT_PULLUP);
+  pinMode(BUTTON4, INPUT_PULLUP);
+
+  digitalWrite(RELAY1, HIGH);
+  digitalWrite(RELAY2, HIGH);
+  digitalWrite(RELAY3, HIGH);
+  digitalWrite(RELAY4, HIGH);
+
+  digitalWrite(OPTO1, LOW);
+  
+  Serial.begin(9600);
+  while (!Serial) {
+    ; // wait for serial port to connect. Needed for native USB port only
+  }
+
+  
+  optoState = false;
+  for (int i=0;i<4;i++){
+    buttonState[i] = digitalRead(button[i]);
+    buttonLastState[i] = buttonState[i];
+    
+    relayState[i] = false;
+  }  
+}
+
+// the loop function runs over and over again forever
+void loop() {
+
+  
+  for (int i=0;i<4;i++){
+
+    //generate the button states...    
+    //Button i press
+    buttonState[i] = digitalRead(button[i]);   
+    if ((buttonState[i] != buttonLastState[i]) && (buttonState[i] == LOW)){
+      buttonPressed[i] = true;    
+    } else {
+      buttonPressed[i] = false;
+    }
+    buttonLastState[i] = buttonState[i];  
+
+    //invert relay if button i is pressed:
+    
+    if (buttonPressed[i]){            
+      if (relayState[i] == false){
+        Serial.print("Command executed: RELAY");Serial.print(i+1);Serial.println("=ON");
+        digitalWrite(relay[i], LOW);
+        relayState[i] = true;  
+      } else {
+        Serial.print("Command executed: RELAY");Serial.print(i+1);Serial.println("=OFF");
+        digitalWrite(relay[i], HIGH);
+        relayState[i] = false;  
+      }        
+      delay(250);
+    }
+  }
+  
+
+  
+  
+  //check for new command...
+  if (Serial.available() > 0) {
+    // get incoming byte:
+    inString = Serial.readString();
+    Serial.print("Command executed: ");
+    Serial.print(inString);
+
+    if (inString.indexOf("LED=ON") >= 0){
+      digitalWrite(LED_BUILTIN, HIGH);
+    } else
+    if (inString.indexOf("LED=OFF") >= 0){
+      digitalWrite(LED_BUILTIN, LOW);
+    } else
+    if (inString.indexOf("RELAY1=ON") >= 0){
+      digitalWrite(RELAY1, LOW);
+      relayState[0] = true;
+    } else
+    if (inString.indexOf("RELAY1=OFF") >= 0){
+      digitalWrite(RELAY1, HIGH);
+      relayState[0] = false;
+    } else
+    if (inString.indexOf("RELAY2=ON") >= 0){
+      digitalWrite(RELAY2, LOW);
+      relayState[1] = true;
+    } else
+    if (inString.indexOf("RELAY2=OFF") >= 0){
+      digitalWrite(RELAY2, HIGH);
+      relayState[1] = false;
+    } else
+    if (inString.indexOf("RELAY3=ON") >= 0){
+      digitalWrite(RELAY3, LOW);
+      relayState[2] = true;
+    } else
+    if (inString.indexOf("RELAY3=OFF") >= 0){
+      digitalWrite(RELAY3, HIGH);
+      relayState[2] = false;
+    } else
+    if (inString.indexOf("RELAY4=ON") >= 0){
+      digitalWrite(RELAY4, LOW);
+      relayState[3] = true;
+    } else
+    if (inString.indexOf("RELAY4=OFF") >= 0){
+      digitalWrite(RELAY4, HIGH);
+      relayState[3] = false;
+    } else
+    if (inString.indexOf("OPTO1=ON") >= 0){
+      digitalWrite(OPTO1, HIGH);
+      optoState = true;
+    } else
+    if (inString.indexOf("OPTO1=OFF") >= 0){
+      digitalWrite(OPTO1, LOW);
+      optoState = false;
+    }
+  }  
+}