ESP8266 Community Forum

Posted: **Fri Dec 04, 2015 3:29 pm**

Hello ESP World!

I am trying to take a MLX90621 sensor and attach it to the ESP8266 and have the temperatures printed to a web page.

Currently, I have a working program that shows the temperatures from the MLX on the serial port using a Pro-mini. I got the code from here https://github.com/longjos/MLX90621_Arduino_Camera and just took out the code that went to the display. This program works great!

Now I would like to use the ESP8266 Thing and have it post the temperatures to a webpage. I took the code from above and added in code to try and make it work with the ESP8266 but when I compile the code I get the following error.

Arduino: 1.6.5 (Windows 7), Board: "SparkFun ESP8266 Thing, 80 MHz, 115200"

twi.c:25:20: fatal error: avr/io.h: No such file or directory
#include <avr/io.h>
^
compilation terminated.
Error compiling.

This report would have more information with
"Show verbose output during compilation"
enabled in File > Preferences.

Could someone please explain why I am getting this error? I thought that the wire library supported the Thing.

Thank you for reading and any help you can provide! Please find the code below =)

Code: Select all

/*
* This project creates a small thermal camera using the MELEXIS MLX90621
* It prints the temperature in the Serial Monitor in degC (degF)
*
* Adapted by Leah Oty December 3, 2015
* https://github.com/longjos/MLX90621_Arduino_Camera
* Based on https://github.com/robinvanemden/MLX90621_Arduino_Processing
* Wire diagram found on http://www.pavlov.io/2015/05/15/detecting-crying-eyes/
*
* Original work by:
* 2013 by Felix Bonowski
* Based on a forum post by maxbot: http://forum.arduino.cc/index.php/topic,126244.msg949212.html#msg949212
* Adapted by Josh Long (https://github.com/longjos) Oct 2015
* Based on a https://github.com/robinvanemden/MLX90621_Arduino_Processing
* This code is in the public domain.
*/
#include <SPI.h>
#include "ESP8266WiFi.h"
#include <Arduino.h>
#include "Wire.h"
#include "MLX90621.h"

MLX90621 sensor; // create an instance of the Sensor class

const char* ssid = "CrMcH7600";
const char* password = "Rc1716PsK";

// Create an instance of the server
// specify the port to listen on as an argument
WiFiServer server(80);

void setup(){
  Serial.begin(115200);
   delay(10);
  sensor.initialise (2); //(A)4 on Mini

    // Connect to 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");
  
  // Start the server
  server.begin();
  Serial.println("Server started");

  // Print the IP address
  Serial.println(WiFi.localIP());
 }
void loop(){

 // Check if a client has connected
  WiFiClient client = server.available();
  if (!client) {
    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 req = client.readStringUntil('\r');
  Serial.println(req);
  client.flush();
  
  sensor.measure(true); //get new readings from the sensor

sensor.getAmbient();
     Serial.println();
     Serial.println("Ambient Temp:");
     Serial.print(sensor.getAmbient());
     Serial.print("(");
      Serial.print((sensor.getAmbient())*1.8+32);
TA = (sensor.getAmbient())*1.8+32;
      Serial.print(")");
     Serial.println();
sensor.getMinTemp();
      Serial.println("MinTemp:");
      Serial.print(sensor.getMinTemp());
      Serial.print("(");
      Serial.print((sensor.getMinTemp())*1.8+32);
TMin = (sensor.getMinTemp())*1.8+32;
      Serial.print(")");
      Serial.println();
sensor.getMaxTemp();
      Serial.println("MaxTemp:");
      Serial.print(sensor.getMaxTemp());
      Serial.print("(");
      Serial.print((sensor.getMaxTemp())*1.8+32);
TMax = (sensor.getMaxTemp())*1.8+32;
      Serial.print(")");
      Serial.println();
  for(int y=0;y<4;y++){ //go through all the rows
    Serial.println();
    for(int x=0;x<16;x++){ //go through all the columns
      Serial.print("   ");
      Serial.print(sensor.getTemperature(y+x*4));
      Serial.print("(");
      Serial.print((sensor.getTemperature(y+x*4))*1.8+32);
AllData = (sensor.getTemperature(y+x*4))*1.8+32;
      Serial.print(")");
    }
  }
  client.flush();

  // Prepare the response
  String s = "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n<!DOCTYPE HTML>\r\n<html>\r\Temperature Readings are: ";
 s += " <br>";
 s += "Ambient Temp:";
 s += TA;
 s += " <br>";
 s += "MinTemp:";
 s += TMin;
 s += " <br>";
 s += MaxTemp:;
 s += TMax;
 s += " <br>";
 s += "All Data";
 s += AllData;
 s += "</html>\n";

  // Send the response to the client
  client.print(s);
}
  delay(1);
  Serial.println("Client disonnected");

  // The client will actually be disconnected 
  // when the function returns and 'client' object is detroyed
};

ESP8266 Community Forum

MLX90621 temperatures posted to webpage help

MLX90621 temperatures posted to webpage help