Juan SantanaSebastian Hernandez
Published © GPL3+

Simulate GPS/Read Photoresistor with MKR1000/ADAFRUIT

"ADAFRUIT IO" makes IoT for everyone. Here we publish the data from a photo-resistor and a simulated GPS.

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Simulate GPS/Read Photoresistor with  MKR1000/ADAFRUIT

Things used in this project

Hardware components

Arduino MKR1000
Arduino MKR1000
×1
Photo resistor
Photo resistor
×1
Resistor 1k ohm
Resistor 1k ohm
×1

Software apps and online services

Arduino IDE
Arduino IDE
ADAFRUIT IO

Story

Read more

Schematics

Hardware

Code

Mkr1000_gps_photoR

Arduino
/***************************************************
 * This proyect is based on information provided from ADAFRUIT
 * And is implemented and adapted for MKR1000. Juan Santana 23.08.2016
 * 
 * 
  Adafruit MQTT Library ESP8266 Example
  Must use ESP8266 Arduino from:
    https://github.com/esp8266/Arduino
  Works great with Adafruit's Huzzah ESP board:
  ----> https://www.adafruit.com/product/2471
  Adafruit invests time and resources providing this open source code,
  please support Adafruit and open-source hardware by purchasing
  products from Adafruit!
  Written by Tony DiCola for Adafruit Industries.
  Adafruit IO example additions by Todd Treece.
  MIT license, all text above must be included in any redistribution
 ****************************************************/
//#include <ESP8266WiFi.h>
#include <SPI.h>
#include <WiFi101.h>
#include "Adafruit_MQTT.h"
#include "Adafruit_MQTT_Client.h"
#include <math.h>

// function prototypes
void connect(void);

/****************************** Pins ******************************************/



/************************* WiFi Access Point *********************************/

#define WLAN_SSID       "sss"      //your WIFI network
#define WLAN_PASS       "sss" // your WIFI passwd

/************************* Adafruit.io Setup *********************************/

#define AIO_SERVER      "io.adafruit.com"
#define AIO_SERVERPORT  1883
#define AIO_USERNAME    "ssss" // ADAFRUIT ID
#define AIO_KEY         "sss" //ADAFRUIT 

/************ Global State (you don't need to change this!) ******************/

// Create an ESP8266 WiFiClient class to connect to the MQTT server.
WiFiClient client;

// Store the MQTT server, client ID, username, and password in flash memory.
// This is required for using the Adafruit MQTT library.
const char MQTT_SERVER[] PROGMEM    = AIO_SERVER;
// Set a unique MQTT client ID using the AIO key + the date and time the sketch
// was compiled (so this should be unique across multiple devices for a user,
// alternatively you can manually set this to a GUID or other random value).
const char MQTT_CLIENTID[] PROGMEM  = __TIME__ AIO_USERNAME;
const char MQTT_USERNAME[] PROGMEM  = AIO_USERNAME;
const char MQTT_PASSWORD[] PROGMEM  = AIO_KEY;

// Setup the MQTT client class by passing in the WiFi client and MQTT server and login details.
Adafruit_MQTT_Client mqtt(&client, MQTT_SERVER, AIO_SERVERPORT, MQTT_CLIENTID, MQTT_USERNAME, MQTT_PASSWORD);

/****************************** Feeds ***************************************/

// Setup a feed called 'lamp' for subscribing to changes.
// Notice MQTT paths for AIO follow the form: <username>/feeds/<feedname>
//const char LAMP_FEED[] PROGMEM = AIO_USERNAME "/feeds/lamp";
//const char FADE_FEED[] PROGMEM = AIO_USERNAME "/feeds/fade";
const char FORE_FEED[] PROGMEM = AIO_USERNAME "/feeds/fore";
//const char FORE_GAUGE_FEED[] PROGMEM = AIO_USERNAME "/feeds/fore_gauge";
//const char MATRIX_FEED[] PROGMEM = AIO_USERNAME "/feeds/matrix";
const char GSMLOC_FEED[] PROGMEM = AIO_USERNAME "/feeds/gsmloc/csv";

//Adafruit_MQTT_Subscribe lamp = Adafruit_MQTT_Subscribe(&mqtt, LAMP_FEED);
//Adafruit_MQTT_Subscribe fade = Adafruit_MQTT_Subscribe(&mqtt, FADE_FEED);

Adafruit_MQTT_Publish fore = Adafruit_MQTT_Publish(&mqtt, FORE_FEED);
//Adafruit_MQTT_Publish fore_gauge = Adafruit_MQTT_Publish(&mqtt, FORE_GAUGE_FEED);
//Adafruit_MQTT_Publish matrix = Adafruit_MQTT_Publish(&mqtt, MATRIX_FEED);
Adafruit_MQTT_Publish gsmloc = Adafruit_MQTT_Publish(&mqtt, GSMLOC_FEED);




/*************************** Sketch Code ************************************/

//Setup general variables
int val = 0;
int val_AnalogIn_A = 0;
int var = 0;
int var_long = 0;
float var_1 = 0.3;

int volt_FR = 0;

#include <SD.h>
#include <stdio.h>
//File *myFile;


// function for MKR1000 in order to get the GPS in a proper format
char *dtostrf (double val, signed char width, unsigned char prec, char *sout) {
  char fmt[20];
  sprintf(fmt, "%%%d.%df", width, prec);
  sprintf(sout, fmt, val);
  return sout;
}

void setup() {

  // set pins


  // set Serial comm
  Serial.begin(9600);
  delay(2000);

  //ADAFRUIT test
  Serial.println(F("Adafruit IO Example"));

  // Connect to WiFi access point.
  Serial.println(); Serial.println();
  delay(5000);
  Serial.print(F("Connecting to "));
  Serial.println(WLAN_SSID);

  WiFi.begin(WLAN_SSID, WLAN_PASS);
  while (WiFi.status() != WL_CONNECTED) {
    delay(5000);
    Serial.print(F("."));
  }
  Serial.println();

  Serial.println(F("WiFi connected"));
  //Serial.println(F("IP address: "));
  //Serial.println(WiFi.localIP());


 // print your WiFi shield's IP address:
  IPAddress ip = WiFi.localIP();
  Serial.print("IP Address Arduino MKR1000: ");
  Serial.println(ip);

  

  // connect to adafruit io
  connect();

}

void loop() {

//define GPS information in a proper data structure
char sendbuffer[120];
uint32_t x=0;
float latitude, longitude, speed_kph, heading, speed_mph, altitude;

//ADAFRUIT handshake
  Adafruit_MQTT_Subscribe *subscription;

  // ping adafruit io a few times to make sure we remain connected
  if(! mqtt.ping(3)) {
    // reconnect to adafruit io
    if(! mqtt.connected())
      connect();
  }


  //prepare data to publish in ADAFRUIT : Photoresistor value and GPS data (simulated in this case)
  
  //Get the PhotoResistor value in Pin A! in MKR1000
  val_AnalogIn_A = analogRead(A1);

  //print out in the serial monitor to check
      Serial.print("Analog In A1 : ");
      Serial.println(val_AnalogIn_A);

      // Grab the current state of the sensor for ADAFRUIT
      int32_t fore_data = val_AnalogIn_A;

       // Publish data

  if (! fore.publish(fore_data)) {
    Serial.println(F("Failed"));
  } else {
    Serial.println(F("OK!"));
  }



    //GPS handshake
   char *p;

    // paste in 'value' first, just an incrementer for GSMLoc
    itoa(x, sendbuffer, 10);
    p = sendbuffer+strlen(sendbuffer);
    p[0] = ','; p++;

    // concat latitude
    latitude =-90 + var + var_1;
    dtostrf(latitude, 2, 6, p);
    p += strlen(p);
    p[0] = ','; p++;
    var++;

    

    // concat longitude
    longitude =-180 + var_long + var_1;
    
    dtostrf(longitude, 3, 6, p);
    p += strlen(p);
    p[0] = ','; p++;
    p[0] = '0'; p++;  // 0 altitude
    // null terminate
    p[0] = 0;
    var_long++;

    if (var == 180)
    {
      var = 0;
      var_1 = var_1 + 0.01;
    }

     if (var_long == 360)
    {
      var_long = 0;
      var_1 = var_1 + 0.02;
    }

    Serial.print("Sending simulated coordinate: "); Serial.println(sendbuffer);
    
    if (! gsmloc.publish(sendbuffer)) {
      Serial.println(F("Failed GPS send info"));
      //txfailures++;
    } else {
      Serial.println(F("send buffer GPS OK!"));
      //txfailures = 0;
    }
  
  delay(100);

  }
  
    
    
    
    
    
    



// connect to adafruit io via MQTT
void connect() {

  Serial.print(F("Connecting to Adafruit IO... "));

  int8_t ret;

  while ((ret = mqtt.connect()) != 0) {

    switch (ret) {
      case 1: Serial.println(F("Wrong protocol")); break;
      case 2: Serial.println(F("ID rejected")); break;
      case 3: Serial.println(F("Server unavail")); break;
      case 4: Serial.println(F("Bad user/pass")); break;
      case 5: Serial.println(F("Not authed")); break;
      case 6: Serial.println(F("Failed to subscribe")); break;
      default: Serial.println(F("Connection failed")); break;
    }

    if(ret >= 0)
      mqtt.disconnect();

    Serial.println(F("Retrying connection..."));
    delay(5000);

  }

  Serial.println(F("Adafruit IO Connected!"));

}

Credits

Juan Santana

Juan Santana

3 projects • 3 followers
Sebastian Hernandez

Sebastian Hernandez

4 projects • 45 followers
Hackster Live ambassador in Colombia.
Thanks to Tony DiCola .

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