diff --git a/.gitignore b/.gitignore
index e43b0f9..79b2f55 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 .DS_Store
+temp/
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..f288702
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
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+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
diff --git a/readme.md b/readme.md
index 44d0693..6cb0dfa 100644
--- a/readme.md
+++ b/readme.md
@@ -89,3 +89,9 @@ GraphViz code generated by parser:
 ## Status
 
 This is very much a work in progress, and mainly an idea in my head.
+A Python module and test scripts is available. Running the test script will generate GraphViz output.
+The parser will follow later; contributions are welcome!
+
+## License
+
+GNU GPLv3
diff --git a/src/.gitignore b/src/.gitignore
new file mode 100644
index 0000000..c18dd8d
--- /dev/null
+++ b/src/.gitignore
@@ -0,0 +1 @@
+__pycache__/
diff --git a/src/input/footer.dot b/src/input/footer.dot
new file mode 100644
index 0000000..5c34318
--- /dev/null
+++ b/src/input/footer.dot
@@ -0,0 +1 @@
+}
diff --git a/src/input/header.dot b/src/input/header.dot
new file mode 100644
index 0000000..e3f1a79
--- /dev/null
+++ b/src/input/header.dot
@@ -0,0 +1,4 @@
+digraph G {
+    graph [rankdir = LR, ranksep=2, fontname = "arial"];
+    edge [arrowhead=none, fontname = "arial"];
+    node [shape=record, style=rounded, fontname = "arial"];
diff --git a/src/output/.gitignore b/src/output/.gitignore
new file mode 100644
index 0000000..95d5a41
--- /dev/null
+++ b/src/output/.gitignore
@@ -0,0 +1 @@
+output.dot
diff --git a/src/output/output_ex1.dot b/src/output/output_ex1.dot
new file mode 100644
index 0000000..65d4d93
--- /dev/null
+++ b/src/output/output_ex1.dot
@@ -0,0 +1,24 @@
+digraph G {
+    graph [rankdir = LR, ranksep=2, fontname = "arial"];
+    edge [arrowhead=none, fontname = "arial"];
+    node [shape=record, style=rounded, fontname = "arial"];
+
+
+X1[label="X1 | {{DCD|RX|TX|DTR|GND|DSR|RTS|CTS|RI} | {<p1>1|<p2>2|<p3>3|<p4>4|<p5>5|<p6>6|<p7>7|<p8>8|<p9>9}}}"]
+
+X2[label="X2 | {{<p1>1|<p2>2|<p3>3|<p4>4|<p5>5|<p6>6} | {|||||}}}"]
+
+{edge[style=bold]
+X2:p5:w -> X2:p6:w
+}
+
+W1[label="W1 | {{<w1i>1|<w2i>2|<w3i>3|<w4i>4} | {WH|BN|GN|Shield} | {<w1o>1|<w2o>2|<w3o>3|<w4o>4}}}"]
+
+{edge[style=bold]
+{edge[color="#000000:#ffffff:#000000"] X1:p2 -> W1:w1i; W1:w1o -> X2:p1}
+{edge[color="#000000:#808000:#000000"] X1:p3 -> W1:w2i; W1:w2o -> X2:p3}
+{edge[color="#000000:#00ff00:#000000"] X1:p5 -> W1:w3i; W1:w3o -> X2:p2}
+}
+
+
+}
diff --git a/src/output/output_ex2.dot b/src/output/output_ex2.dot
new file mode 100644
index 0000000..0c25722
--- /dev/null
+++ b/src/output/output_ex2.dot
@@ -0,0 +1,49 @@
+digraph G {
+    graph [rankdir = LR, ranksep=2, fontname = "arial"];
+    edge [arrowhead=none, fontname = "arial"];
+    node [shape=record, style=rounded, fontname = "arial"];
+
+
+X1[label="X1 | {{GND|+5V|SCL|SDA|MISO|MOSI|SCK|N/C} | {<p1>1|<p2>2|<p3>3|<p4>4|<p5>5|<p6>6|<p7>7|<p8>8}}}"]
+
+X2[label="X2 | {{<p1>1|<p2>2|<p3>3|<p4>4} | {GND|+5V|SCL|SDA}}}"]
+
+X3[label="X3 | {{<p1>1|<p2>2|<p3>3|<p4>4} | {GND|+5V|SCL|SDA}}}"]
+
+X4[label="X4 | {{<p1>1|<p2>2|<p3>3|<p4>4|<p5>5} | {GND|+12V|MISO|MOSI|SCK}}}"]
+
+X5[label="X5 | {{GND|+12V} | {<p1>1|<p2>2}}}"]
+
+W1[label="{{<w1i>1|<w2i>2|<w3i>3|<w4i>4} | {BK|RD|YE|GN} | {<w1o>1|<w2o>2|<w3o>3|<w4o>4}}}"]
+
+{edge[style=bold]
+{edge[color="#000000:#000000:#000000"] X1:p1 -> W1:w1i; W1:w1o -> X2:p1}
+{edge[color="#000000:#ff0000:#000000"] X1:p2 -> W1:w2i; W1:w2o -> X2:p2}
+{edge[color="#000000:#ffff00:#000000"] X1:p3 -> W1:w3i; W1:w3o -> X2:p3}
+{edge[color="#000000:#00ff00:#000000"] X1:p4 -> W1:w4i; W1:w4o -> X2:p4}
+}
+W2[label="{{<w1i>1|<w2i>2|<w3i>3|<w4i>4} | {BK|RD|YE|GN} | {<w1o>1|<w2o>2|<w3o>3|<w4o>4}}}"]
+
+{edge[style=bold]
+{edge[color="#000000:#000000:#000000"] X1:p1 -> W2:w1i; W2:w1o -> X3:p1}
+{edge[color="#000000:#ff0000:#000000"] X1:p2 -> W2:w2i; W2:w2o -> X3:p2}
+{edge[color="#000000:#ffff00:#000000"] X1:p3 -> W2:w3i; W2:w3o -> X3:p3}
+{edge[color="#000000:#00ff00:#000000"] X1:p4 -> W2:w4i; W2:w4o -> X3:p4}
+}
+W3[label="{{<w1i>1|<w2i>2|<w3i>3|<w4i>4} | {BK|BU|OG|VT} | {<w1o>1|<w2o>2|<w3o>3|<w4o>4}}}"]
+
+{edge[style=bold]
+{edge[color="#000000:#000000:#000000"] X1:p1 -> W3:w1i; W3:w1o -> X4:p1}
+{edge[color="#000000:#0000ff:#000000"] X1:p5 -> W3:w2i; W3:w2o -> X4:p3}
+{edge[color="#000000:#ff8000:#000000"] X1:p6 -> W3:w3i; W3:w3o -> X4:p4}
+{edge[color="#000000:#8000ff:#000000"] X1:p7 -> W3:w4i; W3:w4o -> X4:p5}
+}
+W4[label="{{<w1i>1|<w2i>2} | {BK|RD} | {<w1o>1|<w2o>2}}}"]
+
+{edge[style=bold]
+{edge[color="#000000:#000000:#000000"] X5:p1 -> W4:w1i; W4:w1o -> X4:p1}
+{edge[color="#000000:#ff0000:#000000"] X5:p2 -> W4:w2i; W4:w2o -> X4:p2}
+}
+
+
+}
diff --git a/src/output/output_ex3.dot b/src/output/output_ex3.dot
new file mode 100644
index 0000000..2c5ec43
--- /dev/null
+++ b/src/output/output_ex3.dot
@@ -0,0 +1,45 @@
+digraph G {
+    graph [rankdir = LR, ranksep=2, fontname = "arial"];
+    edge [arrowhead=none, fontname = "arial"];
+    node [shape=record, style=rounded, fontname = "arial"];
+
+
+X1[label="X1 | {{|||||||||} | {<p1>1|<p2>2|<p3>3|<p4>4|<p5>5|<p6>6|<p7>7|<p8>8|<p9>9|<p10>10}}}"]
+
+X2[label="X2 | {{<p1>1|<p2>2|<p3>3|<p4>4|<p5>5|<p6>6|<p7>7|<p8>8|<p9>9|<p10>10} | {|||||||||}}}"]
+
+W1[label="{{<w1i>1|<w2i>2|<w3i>3|<w4i>4|<w5i>5|<w6i>6|<w7i>7|<w8i>8|<w9i>9|<w10i>10} | {BN|RD|OG|YE|GN|BU|VT|GY|WH|BK} | {<w1o>1|<w2o>2|<w3o>3|<w4o>4|<w5o>5|<w6o>6|<w7o>7|<w8o>8|<w9o>9|<w10o>10}}}"]
+
+{edge[style=bold]
+{edge[color="#000000:#808000:#000000"] X1:p1 -> W1:w1i; W1:w1o -> X2:p1}
+{edge[color="#000000:#ff0000:#000000"] X1:p2 -> W1:w2i; W1:w2o -> X2:p2}
+{edge[color="#000000:#ff8000:#000000"] X1:p3 -> W1:w3i; W1:w3o -> X2:p3}
+{edge[color="#000000:#ffff00:#000000"] X1:p4 -> W1:w4i; W1:w4o -> X2:p4}
+{edge[color="#000000:#00ff00:#000000"] X1:p5 -> W1:w5i; W1:w5o -> X2:p5}
+{edge[color="#000000:#0000ff:#000000"] X1:p6 -> W1:w6i; W1:w6o -> X2:p6}
+{edge[color="#000000:#8000ff:#000000"] X1:p7 -> W1:w7i; W1:w7o -> X2:p7}
+{edge[color="#000000:#808080:#000000"] X1:p8 -> W1:w8i; W1:w8o -> X2:p8}
+{edge[color="#000000:#ffffff:#000000"] X1:p9 -> W1:w9i; W1:w9o -> X2:p9}
+{edge[color="#000000:#000000:#000000"] X1:p10 -> W1:w10i; W1:w10o -> X2:p10}
+}
+X3[label="X3 | {{|||||||||} | {<p1>1|<p2>2|<p3>3|<p4>4|<p5>5|<p6>6|<p7>7|<p8>8|<p9>9|<p10>10}}}"]
+
+X4[label="X4 | {{<p1>1|<p2>2|<p3>3|<p4>4|<p5>5|<p6>6|<p7>7|<p8>8|<p9>9|<p10>10} | {|||||||||}}}"]
+
+W2[label="{{<w1i>1|<w2i>2|<w3i>3|<w4i>4|<w5i>5|<w6i>6|<w7i>7|<w8i>8|<w9i>9|<w10i>10} | {WH|BN|GN|YE|GY|PK|BU|RD|BK|VT} | {<w1o>1|<w2o>2|<w3o>3|<w4o>4|<w5o>5|<w6o>6|<w7o>7|<w8o>8|<w9o>9|<w10o>10}}}"]
+
+{edge[style=bold]
+{edge[color="#000000:#ffffff:#000000"] X3:p1 -> W2:w1i; W2:w1o -> X4:p1}
+{edge[color="#000000:#808000:#000000"] X3:p2 -> W2:w2i; W2:w2o -> X4:p2}
+{edge[color="#000000:#00ff00:#000000"] X3:p3 -> W2:w3i; W2:w3o -> X4:p3}
+{edge[color="#000000:#ffff00:#000000"] X3:p4 -> W2:w4i; W2:w4o -> X4:p4}
+{edge[color="#000000:#808080:#000000"] X3:p5 -> W2:w5i; W2:w5o -> X4:p5}
+{edge[color="#000000:#ff80c0:#000000"] X3:p6 -> W2:w6i; W2:w6o -> X4:p6}
+{edge[color="#000000:#0000ff:#000000"] X3:p7 -> W2:w7i; W2:w7o -> X4:p7}
+{edge[color="#000000:#ff0000:#000000"] X3:p8 -> W2:w8i; W2:w8o -> X4:p8}
+{edge[color="#000000:#000000:#000000"] X3:p9 -> W2:w9i; W2:w9o -> X4:p9}
+{edge[color="#000000:#8000ff:#000000"] X3:p10 -> W2:w10i; W2:w10o -> X4:p10}
+}
+
+
+}
diff --git a/src/test.py b/src/test.py
new file mode 100644
index 0000000..ee2b8da
--- /dev/null
+++ b/src/test.py
@@ -0,0 +1,75 @@
+import wireviz
+
+PINOUT_SERIAL = ('DCD','RX','TX','DTR','GND','DSR','RTS','CTS','RI')
+
+PINOUT_I2C = ('GND','+5V','SCL','SDA')
+COLORS_I2C = ('BK', 'RD', 'YE', 'GN')
+
+PINOUT_SPI_DATAONLY = ('MISO','MOSI','SCK')
+
+# example 1
+X1 = wireviz.Node("X1", pinout=PINOUT_SERIAL, ports_right=True)
+X2 = wireviz.Node("X2", num_pins=6, ports_left=True)
+W1 = wireviz.Cable("W1", show_name=True, num_wires=3, color_code="DIN", shield=True)
+# Option 1: define wires and shield in one line
+# W1.connect(X1,(5,2,3,5),(1,2,3,'s'),X2,(1,3,2,None))
+# Option 2: define wires and shield separately
+W1.connect(X1,(5,2,3),'auto',X2,(1,3,2)) # wires
+W1.connect(X1,(5,),('s',),X2,(None,))    # shield
+X2.loop(5,6)
+objects = [X1, X2, W1]
+
+# example 2
+# X1 = wireviz.Node("X1", pinout=(
+# 'GND',
+# '+5V',
+# 'SCL',
+# 'SDA',
+# 'MISO',
+# 'MOSI',
+# 'SCK',
+# 'N/C'
+# ), ports_right=True)
+# X2 = wireviz.Node("X2", pinout=PINOUT_I2C, ports_left=True)
+# X3 = wireviz.Node("X3", pinout=PINOUT_I2C, ports_left=True)
+# X4 = wireviz.Node("X4", pinout=('GND','+12V')+PINOUT_SPI_DATAONLY, ports_left=True)
+# X5 = wireviz.Node("X5", pinout=('GND','+12V'), ports_right=True)
+# W1 = wireviz.Cable("W1", colors=COLORS_I2C)
+# W2 = wireviz.Cable("W2", colors=COLORS_I2C)
+# W3 = wireviz.Cable("W3", colors=('BK','BU','OG','VT'))
+# W4 = wireviz.Cable("W4", colors=('BK','RD'))
+# W1.connect(X1,(1,2,3,4),'auto',X2,'auto')
+# W2.connect(X1,(1,2,3,4),'auto',X3,'auto')
+# W3.connect(X1,(1,5,6,7),'auto',X4,(1,3,4,5))
+# W4.connect(X5,'auto','auto',X4,'auto')
+# objects = [X1, X2, X3, X4, X5, W1, W2, W3, W4]
+
+# example 3
+# X1 = wireviz.Node("X1", num_pins=10, ports_right=True)
+# X2 = wireviz.Node("X2", num_pins=10, ports_left=True)
+# W1 = wireviz.Cable("W1", num_wires=10, color_code="IEC")
+# W1.connect_all_straight(X1,X2)
+# X3 = wireviz.Node("X3", num_pins=10, ports_right=True)
+# X4 = wireviz.Node("X4", num_pins=10, ports_left=True)
+# W2 = wireviz.Cable("W2", num_wires=10, color_code="DIN")
+# W2.connect_all_straight(X3,X4)
+# objects = [X1, X2, W1, X3, X4, W2]
+
+with open('output/output.dot','w') as f:
+    with open('input/header.dot','r') as infile:
+        for line in infile:
+            f.write(line)
+    f.write('\n\n')
+
+    for o in objects:
+        f.write(o.graphviz() + '\n')
+
+    f.write('\n\n')
+    with open('input/footer.dot','r') as infile:
+        for line in infile:
+            f.write(line)
+
+# print output file
+# with open('output/output.dot','r') as f:
+#     for line in f:
+#         print(line)
diff --git a/src/wireviz.py b/src/wireviz.py
new file mode 100644
index 0000000..1780e96
--- /dev/null
+++ b/src/wireviz.py
@@ -0,0 +1,202 @@
+
+COLOR_CODE_DIN = ['WH','BN','GN','YE','GY','PK','BU','RD','BK','VT']
+COLOR_CODE_IEC = ['BN','RD','OG','YE','GN','BU','VT','GY','WH','BK']
+
+color_dict = {'BK': '#000000',
+              'WH': '#ffffff',
+              'GY': '#808080',
+              'PK': '#ff80c0',
+              'RD': '#ff0000',
+              'OG': '#ff8000',
+              'YE': '#ffff00',
+              'GN': '#00ff00',
+              'TQ': '#00ffff',
+              'BU': '#0000ff',
+              'VT': '#8000ff',
+              'BN': '#666600',
+              }
+
+class Node:
+
+    def __init__(self, name, num_pins=None, pinout=None, ports_left=False, ports_right=False):
+        self.name = name
+        self.ports_left = ports_left
+        self.ports_right = ports_right
+        self.loops = []
+
+        if pinout is None:
+            self.pinout = ("",) * num_pins
+        else:
+            if num_pins is None:
+                if pinout is None:
+                    raise Exception("Must provide num_pins or pinout")
+                else:
+                    self.pinout = pinout
+
+    def loop(self, from_pin, to_pin, side=None):
+        if self.ports_left == True and self.ports_right == False:
+            loop_side = 'w' # west = left
+        elif self.ports_left == False and self.ports_right == True:
+            loop_side = 'e' # east = right
+        elif self.ports_left == True and self.ports_right == True:
+            if side == None:
+                raise Exception("Must specify side of loop")
+            else:
+                loop_side = side
+        self.loops.append((from_pin, to_pin, loop_side))
+
+    def __repr__(self):
+        return "{} = {} {}".format(self.name, len(self.pinout), self.pinout)
+
+    def __str__(self):
+        return "{}".format(self.name)
+
+    def graphviz(self):
+        s = ''
+        # print header
+        s = s + '{name}[label="{name} | {{'.format(name=self.name)
+        # print pinout
+        if self.ports_left == True:
+            s = s + '{'
+            l = []
+            for i,x in enumerate(self.pinout,1):
+                l.append('<p{portno}>{portno}'.format(portno=i))
+            s = s + '|'.join(l)
+            s = s + '} | '
+
+        s = s + '{'
+        s = s + '|'.join(self.pinout)
+        s = s + '}'
+
+        if self.ports_right == True:
+            s = s + ' | {'
+            l = []
+            for i,x in enumerate(self.pinout,1):
+                l.append('<p{portno}>{portno}'.format(portno=i))
+            s = s + '|'.join(l)
+            s = s + '}'
+
+        s = s + '}}"]'
+
+        # print loops
+        if len(self.loops) > 0:
+            s = s + '\n\n{edge[style=bold]\n'
+            for x in self.loops:
+                s = s + '{name}:p{port_from}:{loop_side} -> {name}:p{port_to}:{loop_side}\n'.format(name=self.name, port_from=x[0], port_to=x[1], loop_side=x[2])
+            s = s + '}'
+
+        s = s + '\n'
+        return s
+
+class Cable:
+
+    def __init__(self, name, show_name=False, num_wires=None, colors=None, color_code=None, shield=False):
+        self.name = name
+        self.show_name = show_name
+        self.shield = shield
+        self.connections = []
+        if color_code is None and colors is None:
+            self.colors = ("",) * num_wires
+        else:
+            if colors is None:
+                if num_wires is None:
+                    raise Exception("Unknown number of wires")
+                else:
+                    # TODO: Loop through colors if num_wires > len(COLOR_CODE_XXX)
+                    if color_code == "DIN":
+                        self.colors = tuple(COLOR_CODE_DIN[:num_wires])
+                    elif color_code == "IEC":
+                        self.colors = tuple(COLOR_CODE_IEC[:num_wires])
+                    else:
+                        raise Exception("Unknown color code")
+            else:
+                if num_wires is None:
+                    self.colors = colors
+                else:
+                    self.colors = colors[:num_wires]
+        # if shield == True:
+        #     self.colors = self.colors + ('Shield',)
+
+    def connect(self, from_name, from_pin, via, to_name, to_pin):
+        if from_pin == 'auto':
+            from_pin = tuple(x+1 for x in range(len(self.colors)))
+        if via == 'auto':
+            via = tuple(x+1 for x in range(len(self.colors)))
+        if to_pin == 'auto':
+            to_pin = tuple(x+1 for x in range(len(self.colors)))
+        if len(from_pin) != len(to_pin):
+            raise Exception("from_pin must have the same number of elements as to_pin")
+        for i, x in enumerate(from_pin):
+            self.connections.append((from_name, from_pin[i], via[i], to_name, to_pin[i]))
+
+    def connect_all_straight(self, from_name, to_name):
+        self.connect(from_name, 'auto', 'auto', to_name, 'auto')
+
+    def __repr__(self):
+        return "{} = {} {}\n     {}".format(self.name, len(self.colors), self.colors, self.connections)
+
+    def debug(self):
+        print(self.name)
+        print(self.colors)
+        if len(self.connections) > 0:
+            for i, x in enumerate(self.connections):
+                if i < len(self.colors):
+                    s = self.colors[int(x[2]-1)]
+                else:
+                    s = '--'
+                # print(self.colors(x[2]) if i < len(self.colors) else '-')
+                print("{}:{} -- {}({}) -> {}:{}".format(x[0],x[1],x[2],s,x[3],x[4]))
+
+    def graphviz(self):
+        s = ''
+        # print header
+        s = s + '{name}[label="'.format(name=self.name)
+
+        if self.show_name == True:
+            s = s + '{name} | '.format(name=self.name)
+
+        s = s + '{'
+        # print pinout
+        s = s + '{'
+        l = []
+        for i,x in enumerate(self.colors,1):
+            l.append('<w{wireno}i>{wireno}'.format(wireno=i))
+        s = s + '|'.join(l)
+        if self.shield == True:
+            s = s + '|<wsi>'
+        s = s + '} | '
+
+        s = s + '{'
+        s = s + '|'.join(self.colors)
+        if self.shield == True:
+            s = s + '|Shield'
+        s = s + '}'
+
+        s = s + ' | {'
+        l = []
+        for i,x in enumerate(self.colors,1):
+            l.append('<w{wireno}o>{wireno}'.format(wireno=i))
+        s = s + '|'.join(l)
+        if self.shield == True:
+            s = s + '|<wso>'
+        s = s + '}'
+
+        s = s + '}}"]'
+
+        s = s + '\n\n{edge[style=bold]\n'
+        for x in self.connections:
+            s = s + '{'
+            if isinstance(x[2], int):
+                search_color = self.colors[x[2]-1]
+                if search_color in color_dict:
+                    s = s + 'edge[color="#000000:{wire_color}:#000000"] '.format(wire_color=color_dict[search_color])
+            if x[1] is not None:
+                t = '{from_name}:p{from_port} -> {via_name}:w{via_wire}i; '.format(from_name=x[0],from_port=x[1],via_name=self.name, via_wire=x[2])
+                s = s + t
+            if x[4] is not None:
+                t = '{via_name}:w{via_wire}o -> {to_name}:p{to_port}'.format(via_name=self.name, via_wire=x[2],to_name=x[3],to_port=x[4])
+                s = s + t
+            s = s + '}\n'
+        s = s + '}'
+
+        return s