Unable to upload the data on thingspeak using uno and esp8266

Question

I am able to connect to thingspeak but now able to upload the data. here are my set of commands:

AT+CIPMUX=0
OK
AT+CIPSTART="TCP","184.106.153.149", 80 
OK
Linked
AT+CIPSTATUS
STATUS:3
+CIPSTATUS:0,"TCP","184.106.153.149",80,0
OK
AT+CIPSEND=45 
> GET /update?api_key=DXDPC4MLXMXFB5TT&field1=60
busy s...
SEND OK
OK

and after some time unlink

I am giving these commands using arudino serial monitor. Please help, I have searched a many blogs, youtube videos.

Answer 1

You have a malformed HTTP request. You only have half of the first line.

A valid HTTP request would look more like this:

GET /update?api_key=DXDPC4MLXMXFB5TT&field1=60 HTTP/1.1
Host: api.thingspeak.com
Content-length: 0
Connection: close
<blank line>

Just sending "GET : ain't gonna work. For a start, the server won't know what protocol you're speaking (HTTP/1.1), nor what website it's supposed to direct the request to (Host: api.thingspeak.com). Also, the final extra blank line is required to finish the request.

• Majenko: Comments are not for extended discussion; this conversation has been moved to chat.

Answer 2

I got it working. Yo!

#include <SoftwareSerial.h>
#include <stdlib.h>
// LED
int ledPin = 13;
// LM35 analog input
int lm35Pin = 0;
float my_value = 22;
// replace with your channel's thingspeak API key
String apiKey = "9PJEF1EP8ZMVY5JA";
// connect 10 to TX of Serial USB
// connect 11 to RX of serial USB
SoftwareSerial ser(10, 11); // RX, TX
// this runs once
void setup() { 
 // initialize the digital pin as an output.
 pinMode(ledPin, OUTPUT); 
 // enable debug serial
 Serial.begin(9600);
 // enable software serial
 ser.begin(9600);
 // reset ESP8266
 ser.println("AT+RST");
}
// the loop
void loop() {
 // blink LED on board
 digitalWrite(ledPin, HIGH); 
 delay(200); 
 digitalWrite(ledPin, LOW);
 // read the value from LM35.
 // read 10 values for averaging.
 // convert to temp:
 // temp value is in 0-1023 range
 // LM35 outputs 10mV/degree C. ie, 1 Volt => 100 degrees C
 // So Temp = (avg_val/1023)*5 Volts * 100 degrees/Volt
 my_value++;
 float temp = my_value;
 // convert to string
 char buf[16];
 String strTemp = dtostrf(temp, 4, 1, buf);
 Serial.println(strTemp);
 // TCP connection
 String cmd = "AT+CIPSTART=\"TCP\",\"";
 cmd += "184.106.153.149"; // api.thingspeak.com
 cmd += "\",80";
 ser.println(cmd);
 if(ser.find("Error")){
 Serial.println("AT+CIPSTART error");
 return;
 }
 // prepare GET string
 String getStr = "GET /update?api_key=";
 getStr += apiKey;
 getStr +="&field1=";
 getStr += String(strTemp);
 getStr +="&field2=";
 getStr += String(strTemp);
 getStr += "\r\n\r\n";
 // send data length
 cmd = "AT+CIPSEND=";
 cmd += String(getStr.length());
 ser.println(cmd);
 Serial.println(cmd);
 if(ser.find(">")){
 ser.print(getStr);
 Serial.println(getStr);
 }
 else{
 ser.println("AT+CIPCLOSE");
 // alert user
 Serial.println("AT+CIPCLOSE");
 }
 // thingspeak needs 15 sec delay between updates
 ser.println("AT+RST");
 delay(30000); 
}