Simulate GPS/Read Photoresistor with MKR1000/ADAFRUIT Using Arduino

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

Things used in this project

Hardware components

Arduino MKR1000

Photo resistor

Resistor 1k ohm

Software apps and online services

Arduino IDE

ADAFRUIT IO

Story

Introduction

How to face IoT, the best is trying and making by yourself with real hardware. In my case I began with MKR1000 – Arduino, the second challenge is to send the information to the web, in this case I find the platform from Adafruit.

With this context I decide to read a photo-resistor with the MKR1000 and publish the information with Adafruit IO. The idea is to learn by your self how to publish data with Adafruit IO, they have a lot a examples and here is also a way to learn.

The Adafruit IO has a GPS viewer and also a GPS and cellular hardware from FONA. Before buying such hardware it is a good idea to simulate the data interface. In this case I generate simulated coordinates but prepared according to the FONA 808 and sent in the right format to Adafruit, in order to have a feeling before to test with real hardware.

The serial monitor from the MKR1000 is showing information to control if all is running OK. Here are some screen shoots from the Adafruit GUI, the serial monitor information and the hardware.

Here is a link to the web, normally the hardware is running to test, if is not the case please write me down and I will assign you a time window to test and the the GUI interface.

https://io.adafruit.com/santanapablo1975/lamp-1

Adafruit

MKR 1000

Here how to set up the blocks in ADAFRUIT:

new block

Here how the dashboard and feed look like in ADAFRUIT IoT:

Schematics

Hardware

Code

/***************************************************
 * 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);