Published February 26, 2016 © GPL3+
Wireless Widget

Imagine that your refrigerator contains inductive power to plug it smart widgets.
IntermediateShowcase (no instructions)1 hour6,978
Things used in this project

Hardware components

Arduino Mega 2560
Arduino Wifi Shield 101
OLED display I2C
OLED display i2C
P9025AC-R-EVK – Qi 5W Receiver Prototype Kit
IDT Qi 5W Receiver Prototype Kit
IDT Qi 5W Transmitter Prototype Kit
P9038-R-EVK – Qi 5W Transmitter Prototype Kit
5V Power supply
Magnet
Cardboard box
Cardboard
USB power supply
Magnet
Sheet of paper
Paper sheet
USB cable type B
Story

In this video, I show a Wireless Widget dedicated to Weather on a fake refrigerator (make with a cardboard box).
How it Works

The Wireless Widget is held on the refrigerator thanks to 8 magnets (4 on the widget and 4 on the refrigerator).
To be powered, the Wireless Widget has a Qi receiver that gets the energy from a Qi transmitter in the refrigerator. The transmitter is powered thanks to a 5V battery for Smartphone.
When the Wireless Widget is powered, its arduino starts, connects to Wi-Fi, finds its location (thanks to the web service http://ip-api.com/), gets weather (thanks to the web service http://api.wunderground.com/weather/api), and shows the weather on its OLED display.
How Make It

On one side of a cardboard : glue an arduino mega with a Wi-Fi shield, an OLED display connected to the arduino (VCC => 5V, GNG => GND, SCL => pin 21, SDA => pin 20) and plug a USB cable to the arduino.
On the other side of this cardboard : glue 4 magnets, glue the Qi receiver and connect the 5V of the USB cable (red wire) to the OUT of the Qi receiver and the GND of the USB cable (black wire) to the GND of the Qi receiver.
On one side of the cardboard box : glue a sheet of paper.
Into the cardboard box : glue 4 magnets, fixe the Qi transmitter (without the glass plane) and connect an USB power supply to the Qi transmitter.
Finally

In this example, we have a weather widget, but we can design other (also based on Qi power and Wi-Fi) like a security camera, photo viewer, twitter display, ...
WirelessWidget.ino
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <EEPROM.h>


#define OLED_RESET 30
Adafruit_SSD1306 display(OLED_RESET);

#define NUMFLAKES 10
#define XPOS 0
#define YPOS 1
#define DELTAY 2

#define DISPLAY_CHAR_SIZE 6
#define TEMP_OFFSET_Y 22

#define ICON_RAIN 0
#define ICON_SNOW 1
#define ICON_CLOUD 2
#define ICON_CLOUD_SUN 3
#define ICON_SUN 4
#define ICON_LOAD 5
#define ICON_ERROR 6
#define ICON_NBR ICON_ERROR + 1

#define IMAGE_OFFSET_X 72
#define IMAGE_OFFSET_Y 8
#define IMAGE_HEIGHT 55
#define IMAGE_WIDTH  55
static const unsigned char PROGMEM images[][385] =
{ 
  // rain
  { 0x0,0x0,0x7f,0x0,0x0,0x0,0x0,
  0x0,0x3,0xff,0xc0,0x60,0x0,0x0,
  0x0,0x7,0xff,0xf3,0xfc,0x0,0x0,
  0x0,0x1f,0xff,0xff,0xff,0x0,0x0,
  0x0,0x3f,0xff,0xff,0xff,0x0,0x0,
  0x0,0x7f,0xff,0xff,0xff,0xf8,0x0,
  0x0,0x7f,0xff,0xff,0xff,0xfe,0x0,
  0x0,0xff,0xff,0xff,0xff,0xff,0x0,
  0x0,0xff,0xff,0xff,0xff,0xff,0x0,
  0x0,0xff,0xff,0xff,0xff,0xff,0x0,
  0x0,0xff,0xff,0xff,0xff,0xff,0x0,
  0x1,0xff,0xff,0xff,0xff,0xff,0x0,
  0x1,0xff,0xff,0xff,0xff,0xff,0x0,
  0x7,0xff,0xff,0xff,0xff,0xff,0xc0,
  0xf,0xff,0xff,0xff,0xff,0xff,0xe0,
  0xf,0xff,0xff,0xff,0xff,0xff,0xe0,
  0x1f,0xff,0xff,0xff,0xff,0xff,0xf0,
  0x1f,0xff,0xff,0xff,0xff,0xff,0xf0,
  0x1f,0xff,0xff,0xff,0xff,0xff,0xf0,
  0x1f,0xff,0xff,0xff,0xff,0xff,0xf0,
  0x1f,0xff,0xff,0xff,0xff,0xff,0xf0,
  0x1f,0xff,0xff,0xff,0xff,0xff,0xf0,
  0x1f,0xff,0xff,0xff,0xff,0xff,0xf0,
  0xf,0xff,0xff,0xff,0xff,0xff,0xe0,
  0x7,0xff,0xff,0xff,0xff,0xff,0xc0,
  0x3,0xff,0xff,0xff,0xff,0xff,0x80,
  0x0,0xff,0xff,0xff,0xff,0xfe,0x0,
  0x0,0x0,0x0,0x0,0x0,0x0,0x0,
  0x0,0x0,0x0,0x0,0x0,0x0,0x0,
  0x0,0x0,0x0,0x0,0x0,0x0,0x0,
  0x0,0x0,0x0,0x0,0x0,0x10,0x0,
  0x0,0x3,0x0,0x8,0x0,0x30,0x0,
  0x0,0x7,0x0,0x38,0x0,0x70,0x0,
  0x0,0xf,0x0,0x78,0x1,0xf0,0x0,
  0x0,0x1f,0x0,0xf8,0x3,0xf0,0x0,
  0x0,0x3f,0x1,0xf8,0x7,0xe0,0x0,
  0x0,0x7f,0x3,0xf8,0xf,0xe0,0x0,
  0x0,0x7f,0x3,0xf8,0xf,0xe0,0x0,
  0x0,0xfe,0x3,0xf8,0xf,0xe0,0x0,
  0x0,0x7e,0x3,0xf0,0xf,0xe0,0x0,
  0x0,0x7e,0x1,0xf0,0x7,0xc0,0x0,
  0x0,0x18,0x0,0xc0,0x1,0x0,0x0,
  0x0,0x0,0x0,0x0,0x0,0x0,0x0,
  0x0,0x0,0x0,0x0,0x0,0x0,0x0,
  0x0,0x0,0x20,0x1,0x80,0x0,0x0,
  0x0,0x0,0xe0,0x3,0x80,0x0,0x0,
  0x0,0x1,0xe0,0xf,0x80,0x0,0x0,
  0x0,0x3,0xe0,0x1f,0x0,0x0,0x0,
  0x0,0x7,0xe0,0x3f,0x0,0x0,0x0,
  0x0,0xf,0xe0,0x7f,0x0,0x0,0x0,
  0x0,0xf,0xe0,0x7f,0x0,0x0,0x0,
  0x0,0x1f,0xe0,0x7f,0x0,0x0,0x0,
  0x0,0xf,0xc0,0x7f,0x0,0x0,0x0,
  0x0,0xf,0xc0,0x3e,0x0,0x0,0x0,
  0x0,0x7,0x80,0x1c,0x0,0x0,0x0 }, 
  // snow
  { 0x0,0x0,0x0,0x30,0x0,0x0,0x0,
  0x0,0x0,0x0,0x38,0x0,0x0,0x0,
  0x0,0x0,0x1c,0x38,0x70,0x0,0x0,
  0x0,0x0,0x1e,0x38,0xf0,0x0,0x0,
  0x0,0x3,0x1f,0x39,0xe3,0x80,0x0,
  0x0,0x3,0x8f,0xbf,0xc3,0x80,0x0,
  0x0,0x3,0x87,0xff,0xc3,0x80,0x0,
  0x0,0x3,0x83,0xff,0x83,0x80,0x0,
  0x0,0xc3,0x81,0xff,0x3,0x8e,0x0,
  0x1,0xf3,0x80,0xfe,0x3,0x9e,0x0,
  0x0,0xfb,0x80,0x78,0x3,0xbc,0x0,
  0x0,0x7f,0x80,0x38,0x3,0xfc,0x0,
  0x0,0x3f,0x80,0x38,0x3,0xf8,0x0,
  0x0,0x1f,0x80,0x38,0x3,0xf0,0x0,
  0xf,0xff,0x80,0x38,0x3,0xff,0xe0,
  0xf,0xff,0xc0,0x38,0x7,0xff,0xe0,
  0xf,0xff,0xe0,0x38,0xf,0xff,0xc0,
  0x0,0x1,0xf0,0x38,0x1f,0x0,0x0,
  0x0,0x0,0xf8,0x38,0x3e,0x0,0x0,
  0x30,0x0,0x7c,0x38,0x7c,0x0,0x38,
  0x38,0x0,0x3e,0x38,0xf8,0x0,0x78,
  0x3e,0x0,0x1f,0x39,0xf0,0x0,0xf8,
  0x1f,0x0,0xf,0xbb,0xe0,0x1,0xf0,
  0xf,0x80,0x7,0xff,0xc0,0x3,0xe0,
  0x7,0xc0,0x3,0xff,0x80,0x7,0xc0,
  0x7,0xc0,0x1,0xff,0x0,0xf,0x80,
  0x7f,0xff,0xff,0xff,0xff,0xff,0xfe,
  0xff,0xff,0xff,0xff,0xff,0xff,0xfe,
  0xff,0xff,0xff,0xff,0xff,0xff,0xfc,
  0x3,0xe0,0x1,0xff,0x0,0x7,0xc0,
  0x7,0xc0,0x3,0xff,0x80,0x7,0xc0,
  0xf,0x80,0x7,0xff,0xc0,0x3,0xe0,
  0x1f,0x0,0xf,0xbb,0xe0,0x1,0xf0,
  0x3e,0x0,0x1f,0x39,0xf0,0x0,0xf8,
  0x3c,0x0,0x3e,0x38,0xf8,0x0,0x38,
  0x38,0x0,0x7c,0x38,0x7c,0x0,0x18,
  0x0,0x0,0xf8,0x38,0x3e,0x0,0x0,
  0x0,0x1,0xf0,0x38,0x1f,0x0,0x0,
  0x7,0xff,0xe0,0x38,0xf,0xff,0xe0,
  0xf,0xff,0xc0,0x38,0x7,0xff,0xe0,
  0xf,0xff,0x80,0x38,0x3,0xff,0xe0,
  0x0,0x1f,0x80,0x38,0x3,0xf0,0x0,
  0x0,0x3f,0x80,0x38,0x3,0xf8,0x0,
  0x0,0x7f,0x80,0x38,0x3,0xfc,0x0,
  0x0,0x7b,0x80,0x3c,0x3,0xbe,0x0,
  0x0,0xf3,0x80,0xfe,0x3,0x9e,0x0,
  0x0,0xe3,0x81,0xff,0x3,0x86,0x0,
  0x0,0x43,0x83,0xff,0x83,0x80,0x0,
  0x0,0x3,0x87,0xff,0xc3,0x80,0x0,
  0x0,0x3,0x87,0xfb,0xe3,0x80,0x0,
  0x0,0x3,0x8f,0x39,0xf1,0x80,0x0,
  0x0,0x0,0x1e,0x38,0xf0,0x0,0x0,
  0x0,0x0,0x1c,0x38,0x70,0x0,0x0,
  0x0,0x0,0x0,0x38,0x0,0x0,0x0,
  0x0,0x0,0x0,0x18,0x0,0x0,0x0 } ,
  // cloud
  { 0x0,0x0,0x0,0x0,0x0,0x0,0x0,
  0x0,0x0,0x0,0x0,0x0,0x0,0x0,
  0x0,0x0,0x0,0x0,0x0,0x0,0x0,
  0x0,0x0,0x0,0x0,0x0,0x0,0x0,
  0x0,0x0,0x0,0x0,0x0,0x0,0x0,
  0x0,0x0,0x0,0x0,0x0,0x0,0x0,
  0x0,0x0,0x0,0x0,0x0,0x0,0x0,
  0x0,0x0,0x0,0x0,0x0,0x0,0x0,
  0x0,0x0,0x0,0x0,0x0,0x0,0x0,
  0x0,0x0,0x0,0x0,0x0,0x0,0x0,
  0x0,0x0,0x3f,0xf0,0x0,0x0,0x0,
  0x0,0x0,0xff,0xfc,0x0,0x0,0x0,
  0x0,0x3,0xff,0xff,0x0,0x0,0x0,
  0x0,0x7,0xff,0xff,0x80,0x0,0x0,
  0x0,0xf,0xff,0xff,0xc0,0x0,0x0,
  0x0,0x1f,0xff,0xff,0xe0,0x0,0x0,
  0x0,0x3f,0xff,0xff,0xf7,0x0,0x0,
  0x0,0x7f,0xff,0xff,0xff,0xe0,0x0,
  0x0,0x7f,0xff,0xff,0xff,0xf0,0x0,
  0x0,0xff,0xff,0xff,0xff,0xf8,0x0,
  0x0,0xff,0xff,0xff,0xff,0xfc,0x0,
  0x0,0xff,0xff,0xff,0xff,0xfc,0x0,
  0x0,0xff,0xff,0xff,0xff,0xfe,0x0,
  0x1,0xff,0xff,0xff,0xff,0xfe,0x0,
  0x1,0xff,0xff,0xff,0xff,0xfe,0x0,
  0x1,0xff,0xff,0xff,0xff,0xfe,0x0,
  0x1,0xff,0xff,0xff,0xff,0xff,0x0,
  0x7,0xff,0xff,0xff,0xff,0xff,0xc0,
  0x1f,0xff,0xff,0xff,0xff,0xff,0xf0,
  0x3f,0xff,0xff,0xff,0xff,0xff,0xf8,
  0x3f,0xff,0xff,0xff,0xff,0xff,0xf8,
  0x7f,0xff,0xff,0xff,0xff,0xff,0xfc,
  0x7f,0xff,0xff,0xff,0xff,0xff,0xfc,
  0xff,0xff,0xff,0xff,0xff,0xff,0xfe,
  0xff,0xff,0xff,0xff,0xff,0xff,0xfe,
  0xff,0xff,0xff,0xff,0xff,0xff,0xfe,
  0xff,0xff,0xff,0xff,0xff,0xff,0xfe,
  0xff,0xff,0xff,0xff,0xff,0xff,0xfe,
  0xff,0xff,0xff,0xff,0xff,0xff,0xfe,
  0x7f,0xff,0xff,0xff,0xff,0xff,0xfc,
  0x7f,0xff,0xff,0xff,0xff,0xff,0xfc,
  0x3f,0xff,0xff,0xff,0xff,0xff,0xf8,
  0x1f,0xff,0xff,0xff,0xff,0xff,0xf0,
  0xf,0xff,0xff,0xff,0xff,0xff,0xe0,
  0x3,0xff,0xff,0xff,0xff,0xff,0x80,
  0x0,0x0,0x0,0x0,0x0,0x0,0x0,
  0x0,0x0,0x0,0x0,0x0,0x0,0x0,
  0x0,0x0,0x0,0x0,0x0,0x0,0x0,
  0x0,0x0,0x0,0x0,0x0,0x0,0x0,
  0x0,0x0,0x0,0x0,0x0,0x0,0x0,
  0x0,0x0,0x0,0x0,0x0,0x0,0x0,
  0x0,0x0,0x0,0x0,0x0,0x0,0x0,
  0x0,0x0,0x0,0x0,0x0,0x0,0x0,
  0x0,0x0,0x0,0x0,0x0,0x0,0x0,
  0x0,0x0,0x0,0x0,0x0,0x0,0x0 },
  // cloud and sun
  { 0x0,0x0,0x7,0x0,0x0,0x0,0x0,
  0x0,0x0,0xf,0x80,0x0,0x0,0x0,
  0x0,0x0,0x1f,0xc0,0x0,0x0,0x0,
  0x0,0x0,0x1f,0xc0,0x0,0x0,0x0,
  0x0,0x0,0x1f,0xc0,0x0,0x0,0x0,
  0x0,0x40,0x1f,0xc0,0x10,0x0,0x0,
  0x1,0xf0,0x1f,0xc0,0x7c,0x0,0x0,
  0x3,0xf8,0xf,0xc0,0xfe,0x0,0x0,
  0x3,0xfc,0x0,0x1,0xfe,0x0,0x0,
  0x3,0xfc,0x0,0x3,0xfe,0x0,0x0,
  0x1,0xfc,0xf,0x81,0xfc,0x0,0x0,
  0x0,0xf0,0x7f,0xf0,0x78,0x0,0x0,
  0x0,0x60,0xff,0xf8,0x70,0x0,0x0,
  0x0,0x63,0xff,0xfe,0x20,0x0,0x0,
  0x0,0x3,0xff,0xfe,0x0,0x0,0x0,
  0x0,0x7,0xff,0xff,0x0,0x0,0x0,
  0x0,0xf,0xff,0xff,0x80,0x0,0x0,
  0x0,0xf,0xff,0xff,0x80,0x0,0x0,
  0xe,0x1f,0xff,0xff,0xc7,0x0,0x0,
  0x3f,0x1f,0xff,0xff,0xc7,0xe0,0x0,
  0x7f,0x1f,0xff,0xff,0x1,0xf0,0x0,
  0x7f,0x1f,0xff,0xfc,0x0,0x70,0x0,
  0x7f,0x1f,0x80,0x70,0x0,0x30,0x0,
  0x7f,0x1c,0x0,0x0,0x38,0x0,0x0,
  0x3f,0x10,0x0,0x1,0xfe,0x0,0x0,
  0x0,0x0,0x0,0x3,0xff,0x0,0x0,
  0x0,0x0,0xff,0xc7,0xff,0x80,0x0,
  0x0,0x3,0xff,0xff,0xff,0xc0,0x0,
  0x0,0x7,0xff,0xff,0xff,0xc1,0x0,
  0x0,0xf,0xff,0xff,0xff,0xdf,0xe0,
  0x0,0x1f,0xff,0xff,0xff,0xff,0xf0,
  0x0,0x3f,0xff,0xff,0xff,0xff,0xf8,
  0x0,0x7f,0xff,0xff,0xff,0xff,0xfc,
  0x0,0x7f,0xff,0xff,0xff,0xff,0xfc,
  0x0,0x7f,0xff,0xff,0xff,0xff,0xfc,
  0x0,0xff,0xff,0xff,0xff,0xff,0xfe,
  0x0,0xff,0xff,0xff,0xff,0xff,0xfe,
  0x0,0xff,0xff,0xff,0xff,0xff,0xfc,
  0x0,0xff,0xff,0xff,0xff,0xff,0xfc,
  0x7,0xff,0xff,0xff,0xff,0xff,0xfc,
  0x1f,0xff,0xff,0xff,0xff,0xff,0xf8,
  0x1f,0xff,0xff,0xff,0xff,0xff,0xf0,
  0x3f,0xff,0xff,0xff,0xff,0xff,0xc0,
  0x7f,0xff,0xff,0xff,0xff,0xff,0x80,
  0x7f,0xff,0xff,0xff,0xff,0xff,0x80,
  0x7f,0xff,0xff,0xff,0xff,0xff,0x80,
  0xff,0xff,0xff,0xff,0xff,0xff,0x80,
  0x7f,0xff,0xff,0xfc,0xff,0xff,0x0,
  0x7f,0xff,0xff,0xf8,0xff,0xfe,0x0,
  0x7f,0xff,0xff,0xf0,0x7f,0xfe,0x0,
  0x7f,0xff,0xff,0xc0,0x3f,0xfc,0x0,
  0x3f,0xff,0x0,0x0,0xf,0xf0,0x0,
  0x1f,0xfe,0x0,0x0,0x0,0x0,0x0,
  0xf,0xf8,0x0,0x0,0x0,0x0,0x0,
  0x3,0xe0,0x0,0x0,0x0,0x0,0x0 },
  // sun
  { 0x0,0x0,0x0,0x38,0x0,0x0,0x0,
  0x0,0x0,0x0,0x7c,0x0,0x0,0x0,
  0x0,0x0,0x0,0x7c,0x0,0x0,0x0,
  0x0,0x0,0x0,0x7c,0x0,0x0,0x0,
  0x0,0x0,0x0,0x7c,0x0,0x0,0x0,
  0x0,0x0,0x0,0x7c,0x0,0x0,0x0,
  0x0,0x0,0x0,0x7c,0x0,0x0,0x0,
  0x0,0x60,0x0,0x7c,0x0,0xc,0x0,
  0x0,0xf0,0x0,0x7c,0x0,0x1e,0x0,
  0x1,0xf8,0x0,0x10,0x0,0x3f,0x0,
  0x1,0xfc,0x0,0x0,0x0,0x7f,0x0,
  0x0,0xfe,0x0,0x0,0x0,0xfe,0x0,
  0x0,0x7f,0x0,0x0,0x1,0xfc,0x0,
  0x0,0x3f,0x0,0x0,0x1,0xf8,0x0,
  0x0,0x1e,0x1,0xff,0x0,0xf0,0x0,
  0x0,0xc,0x7,0xff,0xc0,0x60,0x0,
  0x0,0x0,0x1f,0xff,0xf0,0x0,0x0,
  0x0,0x0,0x3f,0xff,0xf8,0x0,0x0,
  0x0,0x0,0x7f,0xff,0xfc,0x0,0x0,
  0x0,0x0,0xff,0xff,0xfe,0x0,0x0,
  0x0,0x0,0xff,0xff,0xfe,0x0,0x0,
  0x0,0x1,0xff,0xff,0xff,0x0,0x0,
  0x0,0x1,0xff,0xff,0xff,0x0,0x0,
  0x0,0x3,0xff,0xff,0xff,0x80,0x0,
  0x0,0x3,0xff,0xff,0xff,0x80,0x0,
  0x7f,0x83,0xff,0xff,0xff,0x83,0xfc,
  0xff,0x83,0xff,0xff,0xff,0x83,0xfe,
  0xff,0xc3,0xff,0xff,0xff,0x87,0xfe,
  0xff,0x83,0xff,0xff,0xff,0x83,0xfe,
  0x7f,0x83,0xff,0xff,0xff,0x83,0xfc,
  0x0,0x3,0xff,0xff,0xff,0x80,0x0,
  0x0,0x3,0xff,0xff,0xff,0x80,0x0,
  0x0,0x1,0xff,0xff,0xff,0x0,0x0,
  0x0,0x1,0xff,0xff,0xff,0x0,0x0,
  0x0,0x0,0xff,0xff,0xfe,0x0,0x0,
  0x0,0x0,0xff,0xff,0xfe,0x0,0x0,
  0x0,0x0,0x7f,0xff,0xfc,0x0,0x0,
  0x0,0x0,0x3f,0xff,0xf8,0x0,0x0,
  0x0,0x0,0x1f,0xff,0xf0,0x0,0x0,
  0x0,0xc,0x7,0xff,0xc0,0x60,0x0,
  0x0,0x1e,0x1,0xff,0x0,0xf0,0x0,
  0x0,0x3f,0x0,0x0,0x1,0xf8,0x0,
  0x0,0x7f,0x0,0x0,0x1,0xfc,0x0,
  0x0,0xfe,0x0,0x0,0x0,0xfe,0x0,
  0x1,0xfc,0x0,0x0,0x0,0x7f,0x0,
  0x1,0xf8,0x0,0x10,0x0,0x3f,0x0,
  0x0,0xf0,0x0,0x7c,0x0,0x1e,0x0,
  0x0,0x60,0x0,0x7c,0x0,0xc,0x0,
  0x0,0x0,0x0,0x7c,0x0,0x0,0x0,
  0x0,0x0,0x0,0x7c,0x0,0x0,0x0,
  0x0,0x0,0x0,0x7c,0x0,0x0,0x0,
  0x0,0x0,0x0,0x7c,0x0,0x0,0x0,
  0x0,0x0,0x0,0x7c,0x0,0x0,0x0,
  0x0,0x0,0x0,0x7c,0x0,0x0,0x0,
  0x0,0x0,0x0,0x38,0x0,0x0,0x0 },
  // load
  { 0x0,0x0,0x0,0x0,0x0,0x0,0x30,
  0x0,0x0,0x7,0xff,0xc0,0x0,0xf0,
  0x0,0x0,0x3f,0xff,0xfc,0x1,0xf8,
  0x0,0x1,0xff,0xff,0xff,0x3,0xf8,
  0x0,0x3,0xff,0xff,0xff,0xc7,0xf8,
  0x0,0xf,0xff,0xff,0xff,0xef,0xf8,
  0x0,0x1f,0xff,0xff,0xff,0xff,0xf8,
  0x0,0x3f,0xff,0xff,0xff,0xff,0xf8,
  0x0,0x7f,0xff,0xff,0xff,0xff,0xf8,
  0x0,0xff,0xff,0xff,0xff,0xff,0xf8,
  0x1,0xff,0xfc,0x0,0x7f,0xff,0xf8,
  0x3,0xff,0xf0,0x0,0xf,0xff,0xf8,
  0x7,0xff,0xc0,0x0,0x7,0xff,0xf8,
  0x7,0xff,0x80,0x0,0xf,0xff,0xf8,
  0xf,0xff,0x0,0x0,0x1f,0xff,0xf8,
  0x1f,0xfe,0x0,0x0,0x3f,0xff,0xf8,
  0x1f,0xfc,0x0,0x0,0x7f,0xff,0xf8,
  0x1f,0xf8,0x0,0x0,0xff,0xff,0xf8,
  0x3f,0xf0,0x0,0x0,0xff,0xff,0xf8,
  0x3f,0xf0,0x0,0x0,0xff,0xff,0xf8,
  0x3f,0xe0,0x0,0x0,0xff,0xff,0xf0,
  0x7f,0xe0,0x0,0x0,0x0,0x0,0x0,
  0x7f,0xc0,0x0,0x0,0x0,0x0,0x0,
  0x7f,0xc0,0x0,0x0,0x0,0x0,0x0,
  0x7f,0xc0,0x0,0x0,0x0,0x0,0x0,
  0x7f,0xc0,0x0,0x0,0x0,0x0,0x0,
  0x7f,0xc0,0x0,0x0,0x0,0x7,0xfc,
  0x7f,0xc0,0x0,0x0,0x0,0x7,0xfc,
  0x7f,0xc0,0x0,0x0,0x0,0x7,0xfc,
  0x0,0x0,0x0,0x0,0x0,0x7,0xfc,
  0x0,0x0,0x0,0x0,0x0,0x7,0xfc,
  0x0,0x0,0x0,0x0,0x0,0x7,0xfc,
  0x0,0x0,0x0,0x0,0x0,0x7,0xfc,
  0x0,0x0,0x0,0x0,0x0,0xf,0xfc,
  0x1f,0xff,0xfe,0x0,0x0,0xf,0xf8,
  0x3f,0xff,0xfe,0x0,0x0,0x1f,0xf8,
  0x3f,0xff,0xfe,0x0,0x0,0x1f,0xf8,
  0x3f,0xff,0xfe,0x0,0x0,0x3f,0xf0,
  0x3f,0xff,0xfc,0x0,0x0,0x7f,0xf0,
  0x3f,0xff,0xf8,0x0,0x0,0xff,0xf0,
  0x3f,0xff,0xf0,0x0,0x1,0xff,0xe0,
  0x3f,0xff,0xe0,0x0,0x3,0xff,0xc0,
  0x3f,0xff,0xc0,0x0,0x7,0xff,0xc0,
  0x3f,0xff,0xe0,0x0,0x1f,0xff,0x80,
  0x3f,0xff,0xfc,0x0,0x7f,0xff,0x0,
  0x3f,0xff,0xff,0xff,0xff,0xfe,0x0,
  0x3f,0xff,0xff,0xff,0xff,0xfc,0x0,
  0x3f,0xff,0xff,0xff,0xff,0xf8,0x0,
  0x3f,0xff,0xff,0xff,0xff,0xf0,0x0,
  0x3f,0xef,0xff,0xff,0xff,0xe0,0x0,
  0x3f,0xc7,0xff,0xff,0xff,0x80,0x0,
  0x3f,0x81,0xff,0xff,0xff,0x0,0x0,
  0x3f,0x0,0x7f,0xff,0xf8,0x0,0x0,
  0x1e,0x0,0x7,0xff,0xc0,0x0,0x0,
  0x18,0x0,0x0,0x0,0x0,0x0,0x0 },
  // error
  { 0x0,0x20,0x0,0x0,0x0,0x8,0x0,
  0x0,0x38,0x0,0x0,0x0,0x38,0x0,
  0x0,0x7c,0x0,0x0,0x0,0x7c,0x0,
  0x0,0xfe,0x0,0x0,0x0,0xfe,0x0,
  0x1,0xff,0x0,0x0,0x1,0xff,0x0,
  0x7,0xff,0x80,0x0,0x3,0xff,0xc0,
  0x7,0xff,0x80,0x0,0x3,0xff,0xc0,
  0xf,0xff,0xe0,0x0,0xf,0xff,0xe0,
  0x1f,0xff,0xf0,0x0,0x1f,0xff,0xf0,
  0x3f,0xff,0xf8,0x0,0x3f,0xff,0xf8,
  0xff,0xff,0xfc,0x0,0x7f,0xff,0xfe,
  0x7f,0xff,0xfe,0x0,0xff,0xff,0xfc,
  0x7f,0xff,0xfe,0x0,0xff,0xff,0xfc,
  0x3f,0xff,0xff,0x1,0xff,0xff,0xf8,
  0x1f,0xff,0xff,0xc7,0xff,0xff,0xf0,
  0xf,0xff,0xff,0xef,0xff,0xff,0xe0,
  0x7,0xff,0xff,0xff,0xff,0xff,0xc0,
  0x1,0xff,0xff,0xff,0xff,0xff,0x0,
  0x1,0xff,0xff,0xff,0xff,0xff,0x0,
  0x0,0xff,0xff,0xff,0xff,0xfe,0x0,
  0x0,0x7f,0xff,0xff,0xff,0xfc,0x0,
  0x0,0x3f,0xff,0xff,0xff,0xf8,0x0,
  0x0,0x1f,0xff,0xff,0xff,0xf0,0x0,
  0x0,0x7,0xff,0xff,0xff,0xc0,0x0,
  0x0,0x3,0xff,0xff,0xff,0x80,0x0,
  0x0,0x3,0xff,0xff,0xff,0x80,0x0,
  0x0,0x1,0xff,0xff,0xff,0x0,0x0,
  0x0,0x0,0xff,0xff,0xfe,0x0,0x0,
  0x0,0x1,0xff,0xff,0xff,0x0,0x0,
  0x0,0x3,0xff,0xff,0xff,0x80,0x0,
  0x0,0x3,0xff,0xff,0xff,0x80,0x0,
  0x0,0x7,0xff,0xff,0xff,0xc0,0x0,
  0x0,0x1f,0xff,0xff,0xff,0xf0,0x0,
  0x0,0x3f,0xff,0xff,0xff,0xf8,0x0,
  0x0,0x7f,0xff,0xff,0xff,0xfc,0x0,
  0x0,0xff,0xff,0xff,0xff,0xfe,0x0,
  0x1,0xff,0xff,0xff,0xff,0xff,0x0,
  0x1,0xff,0xff,0xff,0xff,0xff,0x0,
  0x7,0xff,0xff,0xff,0xff,0xff,0xc0,
  0xf,0xff,0xff,0xef,0xff,0xff,0xe0,
  0x1f,0xff,0xff,0xc7,0xff,0xff,0xf0,
  0x3f,0xff,0xff,0x1,0xff,0xff,0xf8,
  0x7f,0xff,0xfe,0x0,0xff,0xff,0xfc,
  0x7f,0xff,0xfe,0x0,0xff,0xff,0xfc,
  0xff,0xff,0xfc,0x0,0x7f,0xff,0xfe,
  0x3f,0xff,0xf8,0x0,0x3f,0xff,0xf8,
  0x1f,0xff,0xf0,0x0,0x1f,0xff,0xf0,
  0xf,0xff,0xe0,0x0,0xf,0xff,0xe0,
  0x7,0xff,0x80,0x0,0x3,0xff,0xc0,
  0x7,0xff,0x80,0x0,0x3,0xff,0xc0,
  0x1,0xff,0x0,0x0,0x1,0xff,0x0,
  0x0,0xfe,0x0,0x0,0x0,0xfe,0x0,
  0x0,0x7c,0x0,0x0,0x0,0x7c,0x0,
  0x0,0x38,0x0,0x0,0x0,0x38,0x0,
  0x0,0x20,0x0,0x0,0x0,0x8,0x0 }
};

#if (SSD1306_LCDHEIGHT != 64)
#error("Height incorrect, please fix Adafruit_SSD1306.h!");
#endif

#include <Adafruit_CC3000.h>
#include <ccspi.h>
//#include <SPI.h>
#include <string.h>
#include "utility/debug.h"

#define GET_IP_SERVER cc3000.IP2U32(192, 168, 1, 81);
#define PORT_SERVER 80

#define REFRESH_DELAY 1800000   // 30min

#define ADAFRUIT_CC3000_IRQ   3 
#define ADAFRUIT_CC3000_VBAT  5
#define ADAFRUIT_CC3000_CS    10
Adafruit_CC3000 cc3000 = Adafruit_CC3000(ADAFRUIT_CC3000_CS, ADAFRUIT_CC3000_IRQ, ADAFRUIT_CC3000_VBAT,
                                         SPI_CLOCK_DIVIDER); 

// #define WLAN_SSID       "YourWiFiSsid"           // cannot be longer than 32 characters!
#if ! defined(WLAN_SSID)
#error("Please define WLAN_SSID like the line above");
#endif
// #define WLAN_PASS       "YourWiFiPassword"
#if ! defined(WLAN_PASS)
#error("Please define WLAN_PASS like the line above");
#endif
// Security can be WLAN_SEC_UNSEC, WLAN_SEC_WEP, WLAN_SEC_WPA or WLAN_SEC_WPA2
#define WLAN_SECURITY   WLAN_SEC_WPA2

#define IDLE_TIMEOUT_MS  3000

#define LOCATION_WEBSITE "ip-api.com"
#define LOCATION_WEBPAGE "/json"

#define LAT_BUFFER_SIZE 20
char latBuffer[LAT_BUFFER_SIZE];
#define LAT_PREFIX_SIZE 6
static const char latPrefix[] = {'"', 'l', 'a', 't', '"', ':'};
#define LAT_LAST_CHAR ','

#define LON_BUFFER_SIZE 20
char lonBuffer[LAT_BUFFER_SIZE];
#define LON_PREFIX_SIZE 6
static const char lonPrefix[] = {'"', 'l', 'o', 'n', '"', ':'};
#define LON_LAST_CHAR ','

#define CITY_BUFFER_SIZE 30
char cityBuffer[CITY_BUFFER_SIZE];
#define CITY_PREFIX_SIZE 8
static const char cityPrefix[] = {'"', 'c', 'i', 't', 'y', '"', ':', '"'};
#define CITY_LAST_CHAR '"'

#define WEATHER_WEBSITE "api.wunderground.com"
#define WEATHER_WEBPAGE_BUFFER_SIZE 150
char weatherWebpageBuffer[WEATHER_WEBPAGE_BUFFER_SIZE];

// #define WUNDERGROUND_API_KEY "YourKey"  // get for free http://www.wunderground.com/weather/api/d/pricing.html
#if ! defined(WUNDERGROUND_API_KEY)
#error("Please define WUNDERGROUND_API_KEY like the line above");
#endif

#define TEMP_BUFFER_SIZE 13
char tempBuffer[TEMP_BUFFER_SIZE];
#define TEMP_PREFIX_SIZE 9
static const char tempPrefix[] = {'"', 't', 'e', 'm', 'p', '_', 'c', '"', ':'};
#define TEMP_LAST_CHAR_1 ','
#define TEMP_LAST_CHAR_2 '.'

#define ICON_BUFFER_SIZE 40
char iconBuffer[ICON_BUFFER_SIZE];
#define ICON_PREFIX_SIZE 8
static const char iconPrefix[] = {'"', 'i', 'c', 'o', 'n', '"', ':', '"'};
#define ICON_LAST_CHAR '"'

void setup(void)
{
  Serial.begin(9600);
  
  Serial.println("\nWelcome on Wireless Widget!"); 

  displayInit();
  diplayStatus("CONNECTION", "WIFI", ICON_LOAD); 
  Serial.print("Free RAM: "); Serial.println(getFreeRam(), DEC);
  
  Serial.println(F("\nInitializing cc3000..."));
  if (!cc3000.begin())
  {
    Serial.println(F("Couldn't begin()! Check your wiring?"));
    while(1);
  }
  
  Serial.print(F("Attempting to connect to ")); Serial.println(WLAN_SSID);
  if (!cc3000.connectToAP(WLAN_SSID, WLAN_PASS, WLAN_SECURITY)) {
    Serial.println(F("Failed!"));
    while(1);
  }

  /* Wait for DHCP to complete */
  Serial.println(F("Request DHCP")); 
  while (!cc3000.checkDHCP())
  {
    delay(100); // ToDo: Insert a DHCP timeout!
  }  
}

void loop(void)
{ 
  diplayStatus("LOCATION", "DATA", ICON_LOAD); 

  Serial.println(F("-------------------------------------"));
  
  if (getLocation()) {
    diplayStatus("WEATHER", "DATA", ICON_LOAD); 
    
    weatherWebpageBuffer[0] = '\0';
    strcat(weatherWebpageBuffer, "/api/");
    strcat(weatherWebpageBuffer, WUNDERGROUND_API_KEY);
    strcat(weatherWebpageBuffer, "/conditions/q/");
    strcat(weatherWebpageBuffer, latBuffer);
    strcat(weatherWebpageBuffer, ",");    
    strcat(weatherWebpageBuffer, lonBuffer);
    strcat(weatherWebpageBuffer, ".json");  
    Serial.print("\nweather webpage: ");Serial.println(weatherWebpageBuffer);  
    
    if (weatherFromMyServer()){
      displayInit();
      diplayWeather();
    }
    else{
      displayInit();
      diplayStatus("WEATHER", "DATA", ICON_ERROR); 
    }
  }
  else{
    displayInit();
    diplayStatus("LOCATION", "DATA", ICON_ERROR);  
  } 
  
  delay(REFRESH_DELAY);
}

void displayInit(){
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.clearDisplay();
  display.display();
}

void diplayWeather(){
  display.clearDisplay();
  
  // city
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0,0);
  display.println(cityBuffer);
  display.display();
  
  // icon
  unsigned char icon = iconNameToNumber(iconBuffer);
  display.drawBitmap(IMAGE_OFFSET_X, IMAGE_OFFSET_Y, images[icon], IMAGE_WIDTH, IMAGE_HEIGHT, 1);
  display.display();
  
  // temp
  unsigned char tempLen = 0, i = 0;
  while (i < TEMP_BUFFER_SIZE) {
    if (tempBuffer[i++] == '\0'){
      break;
    }  
    tempLen++;
  }
  display.setTextSize(3);
  display.setTextColor(WHITE);
  display.setCursor(0,24);
  display.println(tempBuffer);
  display.display();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(tempLen * DISPLAY_CHAR_SIZE * 3, TEMP_OFFSET_Y);
  display.println("o");
  display.display();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(tempLen * DISPLAY_CHAR_SIZE * 3 + DISPLAY_CHAR_SIZE, TEMP_OFFSET_Y + 2);
  display.println("C");
  display.display();
}

void diplayStatus(char *title, char *message, unsigned char iconPosition){
  display.clearDisplay();
  
  // city
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0,0);
  display.println(title);
  display.display();
  
  // icon
  display.drawBitmap(IMAGE_OFFSET_X, IMAGE_OFFSET_Y, images[iconPosition], IMAGE_WIDTH, IMAGE_HEIGHT, 1);
  display.display();
  
  // temp
  display.setTextSize(3);
  display.setTextColor(WHITE);
  display.setCursor(0,24);
  display.println(message);
  display.display();
}

/*
* return 1 if data from the webservice is ok
* return 0 if data from the webservice is corupted
*/
unsigned char weatherFromMyServer(){
  uint32_t ip = 0;
  Serial.print(WEATHER_WEBSITE); Serial.print(F(" -> "));
  while (ip == 0) {
    if (! cc3000.getHostByName(WEATHER_WEBSITE, &ip)) {
      Serial.println(F("Couldn't resolve!"));
    }
    delay(500);
  }
  cc3000.printIPdotsRev(ip);Serial.println("");

  Adafruit_CC3000_Client www = cc3000.connectTCP(ip, 80);
  if (www.connected()) {
    www.fastrprint(F("GET "));
    www.fastrprint(weatherWebpageBuffer);
    www.fastrprint(F(" HTTP/1.1\r\n"));
    www.fastrprint(F("Host: ")); www.fastrprint(WEATHER_WEBSITE); www.fastrprint(F("\r\n"));
    www.fastrprint(F("\r\n"));
    www.println();
  } else {
    Serial.println(F("Connection failed"));    
    return 0;
  }
  
  unsigned char tempIndex = 0;
  char foundTemp = 0;
  unsigned char iconIndex = 0;
  char foundIcon = 0;
  unsigned long lastRead = millis();
  while (www.connected() && (millis() - lastRead < IDLE_TIMEOUT_MS)) {
    while (www.available()) {
      char c = www.read();
      
      // parse temp
      jsonParser(c, tempBuffer, TEMP_BUFFER_SIZE, &tempIndex, &foundTemp, tempPrefix, TEMP_PREFIX_SIZE, TEMP_LAST_CHAR_1, TEMP_LAST_CHAR_2, 0);
      // parse icon
      jsonParser(c, iconBuffer, ICON_BUFFER_SIZE, &iconIndex, &foundIcon, iconPrefix, ICON_PREFIX_SIZE, ICON_LAST_CHAR, ICON_LAST_CHAR, 0);

      lastRead = millis();
    }
  }
  www.close();
  
  if (foundTemp && foundIcon){
    Serial.print(F("Temp: "));Serial.println(tempBuffer);
    Serial.print(F("Icon: "));Serial.println(iconBuffer);
    return 1;
  }
  else{
    Serial.println(F("Error to get data from Weather"));
    return 0;
  }
}

/*
* return 1 if data from the webservice is ok
* return 0 if data from the webservice is corupted
*/
unsigned char getLocation(){
  uint32_t ip = 0;
  Serial.print(LOCATION_WEBSITE); Serial.print(F(" -> "));
  while (ip == 0) {
    if (! cc3000.getHostByName(LOCATION_WEBSITE, &ip)) {
      Serial.println(F("Couldn't resolve!"));
    }
    delay(500);
  }
  cc3000.printIPdotsRev(ip);Serial.println("");

  Adafruit_CC3000_Client www = cc3000.connectTCP(ip, 80);
  if (www.connected()) {
    www.fastrprint(F("GET "));
    www.fastrprint(LOCATION_WEBPAGE);
    www.fastrprint(F(" HTTP/1.1\r\n"));
    www.fastrprint(F("Host: ")); www.fastrprint(LOCATION_WEBSITE); www.fastrprint(F("\r\n"));
    www.fastrprint(F("\r\n"));
    www.println();
  } else {
    Serial.println(F("Connection failed"));    
    return 0;
  }
  
  unsigned char latIndex = 0;
  char foundLat = 0;
  unsigned char lonIndex = 0;
  char foundLon = 0;
  unsigned char cityIndex = 0;
  char foundCity = 0;
  unsigned long lastRead = millis();
  while (www.connected() && (millis() - lastRead < IDLE_TIMEOUT_MS)) {
    while (www.available()) {
      char c = www.read();
      
      // parse lat
      jsonParser(c, latBuffer, LAT_BUFFER_SIZE, &latIndex, &foundLat, latPrefix, LAT_PREFIX_SIZE, LAT_LAST_CHAR, LAT_LAST_CHAR, 0);
      // parse lon
      jsonParser(c, lonBuffer, LON_BUFFER_SIZE, &lonIndex, &foundLon, lonPrefix, LON_PREFIX_SIZE, LON_LAST_CHAR, LON_LAST_CHAR, 0);
      // parse city
      jsonParser(c, cityBuffer, CITY_BUFFER_SIZE, &cityIndex, &foundCity, cityPrefix, CITY_PREFIX_SIZE, CITY_LAST_CHAR, CITY_LAST_CHAR, 1);
      
      lastRead = millis();
    }
  }
  www.close();
  
  if (foundLat && foundLon && foundCity){
    Serial.print(F("City: "));Serial.println(cityBuffer);
    Serial.print(F("Lat: "));Serial.println(latBuffer);
    Serial.print(F("Lon: "));Serial.println(lonBuffer);
    return 1;
  }
  else{
    Serial.println(F("Error to get data from location"));
    return 0;
  }
}

void jsonParser(char c, char *buffer, int bufferSize, unsigned char *index, char *found, const char *prefix, int prefixSize, char lastChar1, char lastChar2, unsigned char toUpperCase){
  if ((*index) < bufferSize){
    buffer[(*index)++] = c;  
  }
  else if (! *found){
    for (int i = 0; i < bufferSize - 1; i++){
      buffer[i] = buffer[i + 1];
    }  
    buffer[bufferSize - 1] = c;
    
    char prefixFound = 1;
    int i = 0;
    if (prefixSize > bufferSize){
      prefixFound = 0;  
    }
    while ((i < prefixSize) && prefixFound){
      if (buffer[i] != (prefix[i++])){
        prefixFound = 0;
      }  
    }
    
    if (prefixFound){
      *found = 1;
      // prefixABClastchar => ABC\0
      for (int j = 0; j < prefixSize; j++){
        for (int i = 0; i < bufferSize - 1; i++){
          if ((j == prefixSize - 1) && (toUpperCase) && ( 'a' <= buffer[i + 1]) && (buffer[i + 1] <= 'z')){
            buffer[i] = buffer[ i + 1] - 32;  // to upper case
          }
          else{
            buffer[i] = buffer[i + 1];
          }
        }  
      }
      int i = 1;
      char suffixFound = 0;
      while ((i < bufferSize) && (! suffixFound)){
        if ((buffer[i] == lastChar1) || (buffer[i] == lastChar2)){
          suffixFound = 1;
          buffer[i] = '\0';
        }
        i++;  
      }
      if (! suffixFound){
        buffer[bufferSize - 1] = '\0';
      }  
    }  
  }
}

unsigned char iconNameToNumber(char *name){
  if ((strcmp(name, "chanceflurries") == 0) || (strcmp(name, "chancesleet") == 0) || (strcmp(name, "chancesnow") == 0)
    || (strcmp(name, "flurries") == 0) || (strcmp(name, "sleet") == 0) || (strcmp(name, "snow") == 0)) {
    return ICON_SNOW;  
  }
  else if ((strcmp(name, "chancerain") == 0) || (strcmp(name, "chancetstorms") == 0) || (strcmp(name, "rain") == 0)
     || (strcmp(name, "tstorms") == 0)){
    return ICON_RAIN;
  }
  else if ((strcmp(name, "clear") == 0) || (strcmp(name, "hazy") == 0) || (strcmp(name, "sunny") == 0)){
    return ICON_SUN;  
  }
  else if ((strcmp(name, "cloudy") == 0) || (strcmp(name, "fog") == 0) || (strcmp(name, "unknown") == 0)
     || (strcmp(name, "partlycloudy") == 0)){ 
       return ICON_CLOUD;
  }
  else{
    return ICON_CLOUD_SUN;  
  }
}
Credits

Raffi

2 projects • 1 follower
Wireless Widget

Things used in this project

Hardware components

Story

How it Works

How Make It

Finally

Code

WirelessWidget.ino

Credits

Raffi

Comments

Embed the widget on your own site

Wireless Widget

Wireless Widget

Things used in this project

Hardware components

Story

How it Works

How Make It

Finally

Code

WirelessWidget.ino

Credits

Raffi

Comments

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