IoT with ENC28J60

1// IoT by using module in client mode to send and receive data to your
2  website.
3
4// Simple demo for feeding some random data to Pachube.
5// 2011-07-08
6  <jc@wippler.nl> http://opensource.org/licenses/mit-license.php
7
8// Handle
9  returning code and reset ethernet module if needed
10// 2013-10-22 hneiraf@gmail.com
11
12//
13  Modifing so that it works on my setup for www.thingspeak.com.
14// Arduino pro-mini
15  5V/16MHz, ETH modul on SPI with CS on pin 10.
16// Also added a few changes found
17  on various forums. Do not know what the 
18// res variable is for, tweaked it so
19  it works faster for my application
20// 2015-11-09 dani.lomajhenic@gmail.com
21
22#include
23  <EtherCard.h>
24
25// change these settings to match your own setup
26//#define
27  FEED "000"
28#define APIKEY "beef1337beef1337" // put your key here
29#define
30  ethCSpin 10 // put your CS/SS pin here.
31
32// ethernet interface mac address,
33  must be unique on the LAN
34static byte mymac[] = { 0x74,0x69,0x69,0x2D,0x30,0x31
35  };
36const char website[] PROGMEM = "moty22.co.uk";  //Change to your domain
37  name 
38byte Ethernet::buffer[700];
39uint32_t timer;
40Stash stash;
41byte
42  session;
43String d1;
44//timing variable
45int res = 100; // was 0
46int analog=0;
47
48
49void
50  setup () {
51  pinMode(3,INPUT_PULLUP);
52  pinMode(5,OUTPUT);
53  Serial.begin(9600);
54
55  Serial.println("\
56[ThingSpeak example]");
57
58  //Initialize Ethernet
59
60  initialize_ethernet();
61}
62
63
64void loop () { 
65  //if correct answer
66  is not received then re-initialize ethernet module
67  if (res > 220){
68    initialize_ethernet();
69  
70  }
71  
72  res = res + 1;
73  
74  ether.packetLoop(ether.packetReceive());
75
76  
77  //200 res = 30 seconds (150ms each res)
78  if (res == 200) {
79
80    analog
81  = analogRead(A0);
82    if(digitalRead(3)) {d1 = "OFF";} else {d1 = "ON";}
83  
84
85    // generate 3 values as payload - by using a separate stash,
86    //
87  we can determine the size of the generated message ahead of time
88    
89    byte
90  sd = stash.create();
91
92    stash.print("field1=");
93    stash.print(highByte(analog));
94
95    stash.print("&field2=");
96    stash.print(lowByte(analog));
97    stash.print("&field3=");
98
99    stash.print(d1);
100    
101    stash.save();
102
103    // generate the header
104  with payload - note that the stash size is used,
105    // and that a "stash descriptor"
106  is passed in as argument using "$H"
107    Stash::prepare(PSTR("POST /a21.php
108  HTTP/1.1" "\
\
109"
110      "Host: $F" "\
\
111"
112      "Connection: close"
113  "\
\
114"
115      "X-THINGSPEAKAPIKEY: $F" "\
\
116"
117      "Content-Type:
118  application/x-www-form-urlencoded" "\
\
119"
120      "Content-Length: $D" "\
\
121"
122
123      "\
\
124"
125      "$H"),
126      website, PSTR(APIKEY), stash.size(),
127  sd);
128
129    // send the packet - this also releases all stash buffers once done
130
131    session = ether.tcpSend(); 
132
133  }
134  
135   const char* reply = ether.tcpReply(session);
136
137   
138   if (reply != 0) {
139     res = 0;
140     Serial.println(F(" >>>REPLY
141  recieved...."));
142     Serial.println(reply);
143      if(find(reply,"output=ON")){digitalWrite(5,
144  HIGH);}
145      if(find(reply,"output=OFF")){digitalWrite(5, LOW);}
146     delay(300);
147
148   }
149   delay(150);
150}
151
152boolean find(String string, String value){
153
154  if(string.indexOf(value)>=0)
155    return true;
156  return false;
157}
158
159void
160  initialize_ethernet(void){  
161  for(;;){ // keep trying until you succeed 
162
163
164    if (ether.begin(sizeof Ethernet::buffer, mymac, ethCSpin) == 0){ 
165      Serial.println(
166  "Failed to access Ethernet controller");
167      continue;
168    }
169    
170
171    if (!ether.dhcpSetup()){
172      Serial.println("DHCP failed");
173      continue;
174
175    }
176
177    ether.printIp("IP:  ", ether.myip);
178    ether.printIp("GW:
179  ", ether.gwip);  
180    ether.printIp("DNS: ", ether.dnsip);  
181
182    if
183  (!ether.dnsLookup(website))
184      Serial.println("DNS failed");
185
186    ether.printIp("SRV:
187  ", ether.hisip);
188
189    //reset init value
190    res = 180;
191    break;
192
193  }
194}
195