Arduino Control

Include write_struct.py to control machine arduinos
Can send and receive data.

biomixer_interface/back_end/views.py

@@ -10,7 +10,7 @@
 from .models import *
 import PIL
 from .forms import MaterialFormSet, Labels
-
+from biomixer_interface.arduino.write_struct import MachineCmd
 
 class HomePage(View):
     """
@@ -120,7 +120,14 @@ def post(self, request):
                 value_list.append(answer['value'])
                 material_index.append(i+1)
                 i += 1
-
+            # BEGIN ARDUINO
+            # SEND Values
+            machine = MachineCmd(port='/dev/ttyACM0')   # Hay que poner el port que vayan a usar aquí
+            machine.set_values(d1=value_list[0], d2=value_list[1],
+                               d3=value_list[2], d4=value_list[3])
+            machine.serialize()
+            print(machine.read())
+            # END ARDUINO
         return render(request, 'mixing.html', context={'materials_and_index': zip(material_list, material_index),
                                                        'materials': material_list,
                                                        'values': value_list})

biomixer_interface/biomixer_interface/arduino/write_struct.py

@@ -0,0 +1,37 @@
+# -*- coding: utf-8 -*
+
+import serial
+import struct
+from io import BytesIO
+
+
+class MachineCmd(object):
+    """
+        define the structure of the data, little-endian
+        h is for 2 byte integer, see the full list here https://docs.python.org/3/library/struct.html#format-characters
+        add as many data types as you want to send to arduino
+
+    """
+
+    _struct = struct.Struct('<hhhh')
+
+    def __init__(self, port='/dev/ttyUSB0'):
+        self.arduino = serial.Serial(port, 9600)
+        self.buffer = BytesIO()
+        self.d1 = 0
+        self.d2 = 0
+        self.d3 = 0
+        self.d4 = 0
+
+    def serialize(self):
+        self.buffer.write(self._struct.pack(self.d1, self.d2, self.d3, self.d4))
+
+    @staticmethod
+    def to_hex(data):
+        return ":".join("{:02x}".format(c) for c in data)
+
+    def set_values(self, d1=0, d2=0, d3=0, d4=0):
+        pass
+
+    def read(self):
+        return bytearray(self.buffer.getvalue())