U0zQT4cD

1#define servo 13
2#include <WiFi.h>
3String apiKey = "UB8GQ0ZJ9TBBB0IA"; // Enter your Write API key from ThingSpeak
4const char *ssid = "st"; // replace with your wifi ssid and wpa2 key
5const char *pass = "12345678";
6const char* server = "api.thingspeak.com";
7WiFiClient client;
8int f = 50;
9int pos;
10void setup()
11{
12  ledcAttachPin(servo, 13);
13  ledcSetup(servo, f, 12);
14  Serial.begin(115200);
15  delay(10);
16  Serial.println("Connecting to ");
17  Serial.println(ssid);
18  WiFi.begin(ssid, pass);
19  while (WiFi.status() != WL_CONNECTED)
20  {
21    delay(500);
22    Serial.print(".");
23  }
24  Serial.println("");
25  Serial.println("WiFi connected");
26  
27}
28
29void loop()
30
31{
32  // dealing with 3 variables. Bit, position in degrees and pwm signal in miliseconds.
33  int i = random(410) + 102; // bit range of pwm 0.5ms - 2.5ms is 102 - 512
34  int pos;
35  ledcWrite(servo, i);
36  pos = map(i, 102, 512, 0, 180); // scaling the bit range to the degree range of 0 - 180 degrees.
37  float t = 1/f;
38  float pwm = i*20.0/4095.0;
39  float dutyCycle = pwm*100.0/t;
40  Serial.print("Current angle = ");
41  Serial.println(pos);
42  Serial.print("Current PWM signal = ");
43  Serial.print(pwm);
44  Serial.println("ms");
45  Serial.print("Dutycycle = ");
46  Serial.print(dutyCycle, 0);
47  Serial.println("%");
48  delay (4000);
49
50  
51  if (client.connect(server,80)) // "184.106.153.149" or api.thingspeak.com
52  {
53
54    String postStr = apiKey;
55    postStr +="&field1=";
56    postStr += String(pos);
57    postStr +="&field2=";
58    postStr += String(pwm);
59    postStr +="&field3=";
60    postStr += String(dutyCycle);
61    postStr += "\r\n\r\n";
62    
63    client.print("POST /update HTTP/1.1\n");
64    client.print("Host: api.thingspeak.com\n");
65    client.print("Connection: close\n");
66    client.print("X-THINGSPEAKAPIKEY: "+apiKey+"\n");
67    client.print("Content-Type: application/x-www-form-urlencoded\n");
68    client.print("Content-Length: ");
69    client.print(postStr.length());
70    client.print("\n\n");
71    client.print(postStr);
72
73    Serial.print("Servo position ");
74    client.print("\n\n");
75    Serial.println(pos);
76
77    Serial.println("Send to Thingspeak.");
78  }
79
80  client.stop();
81  Serial.println("Waiting...");
82  delay(4000);
83}