Webserver and thingspeak together?
Posted: Fri Mar 11, 2016 6:19 amHi,
Hope this is the correct place for this post. I have a NodeMCU programming it with Arduino IDE. The chip is amazing. So easy to get onto internet.
I have some simple programs from the examples supplied which work well. One sends data to thingspeak, the other works as a web server sending a web page with temperature included.
The thing is I need to have a program which does both. Sends data to thingspeak every hour but can be polled with a browser when required. I just can't get my head around how to combine the two. The code below calls the getTemp() function every 30 seconds to update temperature, and delivers a web page with the temp. I can call the function to send data to thingspeak every hour with a counter in getTemp(). Do I need to set up another server?
Thanks
Hope this is the correct place for this post. I have a NodeMCU programming it with Arduino IDE. The chip is amazing. So easy to get onto internet.
I have some simple programs from the examples supplied which work well. One sends data to thingspeak, the other works as a web server sending a web page with temperature included.
The thing is I need to have a program which does both. Sends data to thingspeak every hour but can be polled with a browser when required. I just can't get my head around how to combine the two. The code below calls the getTemp() function every 30 seconds to update temperature, and delivers a web page with the temp. I can call the function to send data to thingspeak every hour with a counter in getTemp(). Do I need to set up another server?
Thanks
Code: Select all
#include <ESP8266WiFi.h>
#include <Ticker.h>
const char* ssid = "My SSID"; // edit your wifi name here
const char* password = "My Password"; // type your password here
const char* apiKey = "My key for thingspeak";
Ticker secondTick;
void getTemp(void);
float temp =0; // variable to hold temperature data
int analog = 0; // variable to hold analog data
volatile int eventCount=0;
volatile boolean tempEvent = false;
void ISREvent()
{
eventCount++;
if(eventCount==3){
eventCount=0;
tempEvent=true;
}
WiFiServer server(80);
void setup() {
Serial.begin(115200);// preapring to use serial communication
delay(10);
secondTick.attach(10,ISREvent);//attach the ISR routine this will give 10 seconds * 3 in ISR = 30 secs.
// Connect to WiFi network
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");
// Start the server
server.begin();
Serial.println("Server started");
// Print the IP address
Serial.print("Use this URL to connect: ");
Serial.print("http://");
Serial.print(WiFi.localIP());
Serial.println("/");
}
void loop() {
// Check if a client has connected
WiFiClient client = server.available();
if (!client) {
if(tempEvent==true)
{
getTemp();
tempEvent=false;
}
return;
}
// Wait until the client sends some data
Serial.println("new client");
while(!client.available()){
delay(1);
}
// Read the first line of the request
String request = client.readStringUntil('\r');
Serial.println(request);
client.flush();
// Return the response as a webpage with temp.
//removed to keep code small
delay(1);
Serial.println("Client disonnected");
Serial.println("");
}
void getTemp()
{
//temperature taken here.
//counter here which when 1 hour passed calls thingspeak with temp
}
void sendDataThingSpeak(float temp)
{
if (client.connect(server,80)) { // "184.106.153.149" or api.thingspeak.com
String postStr = apiKey;
postStr +="&field1=";
postStr += String(temp);
postStr += "\r\n\r\n";
client.print("POST /update HTTP/1.1\n");
client.print("Host: api.thingspeak.com\n");
client.print("Connection: close\n");
client.print("X-THINGSPEAKAPIKEY: "+apiKey+"\n");
client.print("Content-Type: application/x-www-form-urlencoded\n");
client.print("Content-Length: ");
client.print(postStr.length());
client.print("\n\n");
client.print(postStr);
Serial.print("Temperature: ");
Serial.print(temp);
Serial.println("% send to Thingspeak");
}
client.stop();
}
