Initial check-in

App/GetState.bat

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+@echo off
+.\USBCaseControl.py -c "GETSTATE"
+pause

App/MasterOff.bat

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+@echo off
+.\USBCaseControl.py -c "MASTER=OFF"
+pause

App/MasterOn.bat

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+@echo off
+.\USBCaseControl.py -c "MASTER=ON"
+pause

App/USBCaseControl.py

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+import serial.tools.list_ports
+import sys, getopt
+import time
+
+
+def main(argv):
+    cmd = 'GETSTATE'
+    print("USBCaseControl starting up...")
+    try:
+        opts, args = getopt.getopt(argv,"hc:",["cmd="])
+    except getopt.GetoptError as err:
+        print(err)
+        sys.exit(2)
+    for opt, arg in opts:
+        if opt == '-h':
+            print("USBCaseControl.py --cmd <command>")
+            sys.exit()
+        elif opt in ("-c", "--cmd"):
+            cmd = arg            
+    ports = serial.tools.list_ports.comports()
+    for port, desc, hwid in sorted(ports):
+        if "Arduino Leonardo" in desc:
+            print("{}: {} [{}]".format(port, desc, hwid))
+            finalport=port
+    ser = serial.Serial(finalport, 9600, timeout=0,parity=serial.PARITY_EVEN, rtscts=1)
+    print("Calling command: {} on Port {}".format(cmd,port))
+    ser.write(cmd.encode('utf_8'))
+    time.sleep(2)
+    out = ser.read(100)
+    print("Command return: {}".format(out.decode(encoding="utf_8", errors="ignore")))
+
+if __name__ == "__main__":
+   main(sys.argv[1:])

Firmware/RelayBoardOnMicro.ino

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+/*
+  Serial Call and Response in ASCII
+  Language: Wiring/Arduino
+
+  This program sends an ASCII A (byte of value 65) on startup and repeats that
+  until it gets some data in. Then it waits for a byte in the serial port, and
+  sends three ASCII-encoded, comma-separated sensor values, truncated by a
+  linefeed and carriage return, whenever it gets a byte in.
+
+  The circuit:
+  - potentiometers attached to analog inputs 0 and 1
+  - pushbutton attached to digital I/O 2
+
+  created 26 Sep 2005
+  by Tom Igoe
+  modified 24 Apr 2012
+  by Tom Igoe and Scott Fitzgerald
+  Thanks to Greg Shakar and Scott Fitzgerald for the improvements
+
+  This example code is in the public domain.
+
+  http://www.arduino.cc/en/Tutorial/SerialCallResponseASCII
+*/
+
+#define MASTER 6
+#define CIRCUIT1 7
+#define CIRCUIT2 8
+#define CIRCUIT3 9
+
+String inString;
+int MasterState = 0;
+int Circuit1State = 0;
+int Circuit2State = 0;
+int Circuit3State = 0;
+
+void setup() {
+  // start serial port at 9600 bps and wait for port to open:
+  Serial.begin(9600);
+  while (!Serial) {
+    ; // wait for serial port to connect. Needed for native USB port only
+  }
+
+
+  pinMode(MASTER, OUTPUT);  
+  pinMode(CIRCUIT1, OUTPUT);  
+  pinMode(CIRCUIT2, OUTPUT); 
+  pinMode(CIRCUIT3, OUTPUT); 
+
+  digitalWrite(MASTER, HIGH);
+  digitalWrite(CIRCUIT1, HIGH);
+  digitalWrite(CIRCUIT2, HIGH);
+  digitalWrite(CIRCUIT3, HIGH);
+}
+
+int setState(String cmd, String ref,int pin,int state,int store){
+  if (cmd.indexOf(ref) >= 0){
+    digitalWrite(pin,state);
+    Serial.print("Pin ");
+    Serial.print(pin);
+    Serial.print(" was set to: ");
+    Serial.println(state);
+    return !state;
+  }
+  return store;
+}
+
+void loop() {
+  // if we get a valid byte, read analog ins:
+  
+  if (Serial.available() > 0) {
+    // get incoming byte:
+    inString = Serial.readString();
+    Serial.print("Command received: ");
+    Serial.println(inString);
+
+    MasterState = setState(inString,"MASTER=ON",MASTER,LOW,MasterState);
+    MasterState = setState(inString,"MASTER=OFF",MASTER,HIGH,MasterState);
+
+    Circuit1State = setState(inString,"CIRCUIT1=ON",CIRCUIT1,LOW,Circuit1State);
+    Circuit1State = setState(inString,"CIRCUIT1=OFF",CIRCUIT1,HIGH,Circuit1State);
+
+    Circuit2State = setState(inString,"CIRCUIT2=ON",CIRCUIT2,LOW,Circuit2State);
+    Circuit2State = setState(inString,"CIRCUIT2=OFF",CIRCUIT2,HIGH,Circuit2State);
+
+    Circuit3State = setState(inString,"CIRCUIT3=ON",CIRCUIT3,LOW,Circuit3State);
+    Circuit3State = setState(inString,"CIRCUIT3=OFF",CIRCUIT3,HIGH,Circuit3State);
+
+    if (inString.indexOf("GETSTATE") >= 0){
+      Serial.print("MASTER=");
+      Serial.println(MasterState);
+      Serial.print("CIRCUIT1=");
+      Serial.println(Circuit1State);
+      Serial.print("CIRCUIT2=");
+      Serial.println(Circuit2State);
+      Serial.print("CIRCUIT3=");
+      Serial.println(Circuit3State);
+    }
+  }
+  
+}

readme.md

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+# USB Base Control
+
+This is a small project to enable the switch of several relays on a 4 relay board connected to an Arduino Board which is connected to a PC via USB cable.
+So switch the different relays and the master power a python script is provided aswell.
+
+## App
+Contains the pyhton script and a couple of batch files to be used under windows.
+
+## Firmware
+Contains the Arduino IDE sketch to switch the relays based on TTY over USB cable connection.