Control your Arduino from your laptop via WiFi with ESP13

1import socket
2import tkinter as tk
3from tkinter import *
4HOST  = ''   # Symbolic name, meaning all available interfaces
5PORT = 9000 # Arbitrary  non-privileged port
6
7# Socket connection is a three step process - create,  bind and connect
8# Create the socket
9s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
10
11#Following  routines are defined to handle button events from the GUI
12#First routine handles  Initialize button event; creates and binds the socket 
13def initialize(event):
14	entry1.insert  (0,'Socket created')
15	
16	try:
17	   s.bind((HOST, PORT))
18	except socket.error  as msg:
19	   entry1.insert ('Bind failed. Error Code : ' + str(msg[0]) + ' Message  ' + str(msg[1]))
20	   sys.exit()
21   
22	entry1.insert(END,' Socket bind  complete')
23	print('Socket bind complete')
24	print(s.getsockname())
25
26#Second  routine handles Connect button event; connects the ESP13 shield to the socket
27#and  prints out the IP address of the ESP13 shield	
28def connect(event):
29	global  conn	
30	entry2.insert(0,'Socket now listening')
31	s.listen()
32	conn, addr  = s.accept()
33	connection = 'Connected with ' + addr[0] + ':' + str(addr[1])
34	print('connection  ',addr)
35	entry2.delete(0,tk.END)
36	entry2.insert(0,connection)
37	print('connect  complete')
38	
39#Third routine handles Send button event; send the contents  of the entry dialog to Arduino
40#via ESP13 shield and gets the return message  and populates the entry dialog box with the return
41#message
42def send(event):
43	data  = entry3.get()
44	conn.send(data.encode('utf-8'))
45	print('send',data)
46	data1  = conn.recv(70)
47	entry4.delete(0,tk.END)
48	entry4.insert(0,data1)
49	
50#Fourth  routine handles LED Update button event; sends the value of the LED brightness slider
51#(+  the arbitary header)to the ESP13
52#Reads the return message and updates the potentiometer  slider. Dont forget the string to integer conversion
53def update(event):
54	data  = '12#$'
55	data = data + str(slider2.get())
56	print(data)
57	conn.send(data.encode('utf-8'))
58	data1  = conn.recv(70)
59	slider1.set(int(data1))
60	print(data1)
61	print('Update  LED')
62
63#Final routine handles the Exit button; closes the socket, closes the  GUI and exits program
64def exit(event):
65	s.close()
66	print('exit')
67	window.destroy()
68
69#All  below is tkinter programming to create the GUI. Main window contains two frames,  one for entry dialog and sliders
70#second for buttons
71window = tk.Tk()
72window.title("ESP13  Communication")
73
74frame1 = tk.Frame(master=window,relief=tk.FLAT,	borderwidth=5)
75frame1.pack()
76frame2  = tk.Frame(master=window,relief=tk.FLAT,	borderwidth=5)
77frame2.pack()
78
79label1  = tk.Label(master=frame1,text="Socket Ready",fg="black",width = 25,height =  2)
80label1.grid(row=0,column=0,padx=20,pady=20,sticky="w")
81
82entry1 = tk.Entry(master=frame1,fg="black",bg="white",width=75)
83entry1.grid(row=0,column=1,padx=10,pady=10)
84
85label2  = tk.Label(master=frame1,text="Socket Connected",fg="black",width = 25,height  = 2)
86label2.grid(row=1,column=0,padx=20,pady=20,sticky="w")
87
88entry2 =  tk.Entry(master=frame1,fg="black",bg="white",width=75)
89entry2.grid(row=1,column=1,padx=10,pady=10)
90
91label3  = tk.Label(master=frame1,text="Message to send",fg="black",width = 25,height  = 2)
92label3.grid(row=2,column=0,padx=20,pady=20,sticky="w")
93
94entry3 =  tk.Entry(master=frame1,fg="black",bg="white",width=75)
95entry3.grid(row=2,column=1,padx=10,pady=10)
96entry3.bind("<Return>",send)
97
98label4  = tk.Label(master=frame1,text="Message recieved",fg="black",width = 25,height  = 2)
99label4.grid(row=3,column=0,padx=20,pady=20,sticky="w")
100
101entry4 =  tk.Entry(master=frame1,fg="black",bg="white",width=75)
102entry4.grid(row=3,column=1,padx=10,pady=10)
103
104label5  = tk.Label(master=frame1,text="Analog Input",fg="black",width = 25,height =  2)
105label5.grid(row=4,column=0,padx=20,pady=20,sticky="w")
106
107slider1 =  Scale(frame1, from_=0, to=1023, length=600, orient=HORIZONTAL)
108slider1.grid(row=4,column=1,padx=10,pady=10)
109
110label6  = tk.Label(master=frame1,text="LED Brightness",fg="black",width = 25,height  = 2)
111label6.grid(row=5,column=0,padx=20,pady=20,sticky="w")
112
113slider2  = Scale(frame1, from_=0, to=255, length=600, orient=HORIZONTAL)
114slider2.grid(row=5,column=1,padx=10,pady=10)
115
116button1  = tk.Button(master=frame2,text="Initialize",width=10,height=2,relief=tk.RAISED,fg="black")
117button1.grid(row=0,column=0,padx=20,pady=20)
118button1.bind("<Button-1>",initialize)
119
120button2  = tk.Button(master=frame2,text="Connect",width=10,height=2,relief=tk.RAISED,fg="black")
121button2.grid(row=0,column=1,padx=20,pady=20)
122button2.bind("<Button-1>",connect)
123
124button3  = tk.Button(master=frame2,text="Send",width=10,height=2,relief=tk.RAISED,fg="black")
125button3.grid(row=0,column=2,padx=20,pady=20)
126button3.bind("<Button-1>",send)
127
128button4  = tk.Button(master=frame2,text="LED Update",width=10,height=2,relief=tk.RAISED,fg="black")
129button4.grid(row=0,column=3,padx=20,pady=20)
130button4.bind("<Button-1>",update)
131
132button5  = tk.Button(master=frame2,text="Exit",width=10,height=2,relief=tk.RAISED,fg="black")
133button5.grid(row=0,column=4,padx=20,pady=20)
134button5.bind("<Button-1>",exit)
135
136window.mainloop()
137print('Program  ended')
138

1/*
2  Arduino ESP13 Shield Program
3
4  Once the ESP13 shield has
5  connected to a WiFi Network, it sends data over the network from the Arduino that
6  is
7  written to the Serial lines. All data that the Arduino sends and recieves
8  over the WiFi network uses the Serial.read, Serial.write
9  and Serial.print commands.
10
11
12  This program receives data from program running on a laptop using the socket connection.
13
14
15  In order to distinguish beteeen a simple receive / echo case and the LED brightness
16  adjust, a arbitary string "12#$" is transmitted
17  as the four beginning bytes.
18  If this is detected, then LED brightness is updated and pot value read from reply.
19  (This string is totally
20  arbitary)
21
22  If the header string is not present,
23  then the arduino echos the the message sent.  
24*/
25String incomingString;
26String
27  analogValue;
28String headerString;
29
30int ledPin = 3;
31
32void setup()
33  {
34  // put your setup code here, to run once
35  // Baud rate of ESP13 shield
36  set up in configuration
37  Serial.begin(115200);
38}
39
40void loop() {
41
42  // reply only when you receive data:
43  if (Serial.available() > 0)
44  {
45
46    // read the incoming string and strip out four first bytes:
47    incomingString
48  = Serial.readString();
49    headerString = incomingString.substring(0,4);
50
51    // If the header string equals "12#$" then update LED brightenss and pot value
52
53    if (headerString.equals("12#$"))
54    {
55      //remove the first four
56  bytes, analogWrite function needs and integer, conversion required
57      incomingString.remove(0,4);
58
59      analogWrite(ledPin,incomingString.toInt());
60      //read the A0 analog
61  input, convert to string and send back
62      analogValue = String(analogRead(A0),DEC);
63
64      Serial.print(analogValue);
65    }
66    else
67    {
68    // say what
69  you got:
70      Serial.print("ESPRecieved: ");
71      Serial.flush();
72
73      Serial.print(incomingString);
74    }
75  }
76  else
77  {
78    delay(500);
79    
80  }
81
82}
83

1/*
2  Arduino ESP13 Shield Program
3
4  Once the ESP13 shield has  connected to a WiFi Network, it sends data over the network from the Arduino that  is
5  written to the Serial lines. All data that the Arduino sends and recieves  over the WiFi network uses the Serial.read, Serial.write
6  and Serial.print commands.
7
8  This program receives data from program running on a laptop using the socket connection.
9
10  In order to distinguish beteeen a simple receive / echo case and the LED brightness  adjust, a arbitary string "12#$" is transmitted
11  as the four beginning bytes.  If this is detected, then LED brightness is updated and pot value read from reply.  (This string is totally
12  arbitary)
13
14  If the header string is not present,  then the arduino echos the the message sent.  
15*/
16String incomingString;
17String  analogValue;
18String headerString;
19
20int ledPin = 3;
21
22void setup()  {
23  // put your setup code here, to run once
24  // Baud rate of ESP13 shield  set up in configuration
25  Serial.begin(115200);
26}
27
28void loop() {
29  // reply only when you receive data:
30  if (Serial.available() > 0)
31  {
32    // read the incoming string and strip out four first bytes:
33    incomingString  = Serial.readString();
34    headerString = incomingString.substring(0,4);
35    // If the header string equals "12#$" then update LED brightenss and pot value
36    if (headerString.equals("12#$"))
37    {
38      //remove the first four  bytes, analogWrite function needs and integer, conversion required
39      incomingString.remove(0,4);
40      analogWrite(ledPin,incomingString.toInt());
41      //read the A0 analog  input, convert to string and send back
42      analogValue = String(analogRead(A0),DEC);
43      Serial.print(analogValue);
44    }
45    else
46    {
47    // say what  you got:
48      Serial.print("ESPRecieved: ");
49      Serial.flush();
50      Serial.print(incomingString);
51    }
52  }
53  else
54  {
55    delay(500);    
56  }
57
58}
59