Created
April 14, 2015 06:53
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Thinkspeak Post Data
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#include <ESP8266WiFi.h> | |
const char* ssid = "-----------"; | |
const char* password = "-----------"; | |
// ThingSpeak Settings | |
char thingSpeakAddress[] = "api.thingspeak.com"; | |
String writeAPIKey = "----------------------"; | |
const int updateThingSpeakInterval = 15 * 1000; // Time interval in milliseconds to update ThingSpeak (number of seconds * 1000 = interval) | |
// Variable Setup | |
long lastConnectionTime = 0; | |
boolean lastConnected = false; | |
int failedCounter = 0; | |
int value = 0; | |
// Initialize Arduino Ethernet Client | |
WiFiClient client; | |
void setup() | |
{ | |
// Start Serial for debugging on the Serial Monitor | |
Serial.begin(115200); | |
delay(10); | |
// We start by connecting to a WiFi network | |
Serial.println(); | |
Serial.println(); | |
Serial.print("Connecting to "); | |
Serial.println(ssid); | |
WiFi.begin(ssid, password); | |
while (WiFi.status() != WL_CONNECTED) { | |
delay(500); | |
Serial.print("."); | |
} | |
Serial.println(""); | |
Serial.println("WiFi connected"); | |
Serial.println("IP address: "); | |
Serial.println(WiFi.localIP()); | |
} | |
void loop() | |
{ | |
String strValue0 = (String) value ; | |
// Read value from Analog Input Pin 0 | |
//String analogValue0 = String(analogRead(A0), DEC); | |
// Print Update Response to Serial Monitor | |
if (client.available()) | |
{ | |
//char c = client.read(); | |
//Serial.print(c); | |
//see all response | |
while ( client.available() > 0 ) { | |
char c = client.read(); | |
Serial.print(c); | |
} | |
} | |
// Disconnect from ThingSpeak | |
if (!client.connected() && lastConnected) | |
{ | |
Serial.println("...disconnected"); | |
Serial.println(); | |
client.stop(); | |
} | |
// Update ThingSpeak | |
if(!client.connected() && (millis() - lastConnectionTime > updateThingSpeakInterval)) | |
{ | |
updateThingSpeak("field1="+strValue0); | |
Serial.println (strValue0); | |
if (value > 256) value = 0; | |
value++; | |
} | |
lastConnected = client.connected(); | |
} | |
void updateThingSpeak(String tsData) | |
{ | |
if (client.connect(thingSpeakAddress, 80)) | |
{ | |
client.print("POST /update HTTP/1.1\n"); | |
client.print("Host: api.thingspeak.com\n"); | |
client.print("Connection: close\n"); | |
client.print("X-THINGSPEAKAPIKEY: "+writeAPIKey+"\n"); | |
client.print("Content-Type: application/x-www-form-urlencoded\n"); | |
client.print("Content-Length: "); | |
client.print(tsData.length()); | |
client.print("\n\n"); | |
client.print(tsData); | |
lastConnectionTime = millis(); | |
if (client.connected()) | |
{ | |
Serial.println("Connecting to ThingSpeak..."); | |
Serial.println(); | |
failedCounter = 0; | |
} | |
else | |
{ | |
failedCounter++; | |
Serial.println("Connection to ThingSpeak failed ("+String(failedCounter, DEC)+")"); | |
Serial.println(); | |
} | |
} | |
else | |
{ | |
failedCounter++; | |
Serial.println("Connection to ThingSpeak Failed ("+String(failedCounter, DEC)+")"); | |
Serial.println(); | |
lastConnectionTime = millis(); | |
} | |
} |
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