Hello everybody,
All started when I looked for a nice Saturday morning project.
I looked in the tech websites and I saw a new air pollution app called Breezometer. The app tells you in real time the air quality of your position or any other position you want, on a map with color (red is bad, yellow - Comsi Comsa, green is “go out now!” - and of course all the colors between).
The project takes the information from Breezometer and write it on your LCD screen. In addition, the Spark light the RGB LED with the same color you would see on the map!
To get the information you need to register online breezometer.com/api/ (free and takes 2 minutes). From here, it’s a simple GET request.
The schematic:
About the code:
I think most of it is clear. One complicated part was taking the value from the JSON. Apparently, there is no better way… (just the webhook that @peekay123 suggested). If you want to change the location to another city or to Latitude & Longitude you need play with the code a little bit.
// This #include statement was automatically added by the Spark IDE.
#include "HttpClient/HttpClient.h"
// This #include statement was automatically added by the Spark IDE.
#include "LiquidCrystal/LiquidCrystal.h"
String token = "GET YOUR OWN KEY!";
//button
int button = D6;
//LEDs
int RedLED = A3;
int GreenLED = A5;
int BlueLED = A6;
//parameters
int AQI;
String num1;
//libraries
////LCD
LiquidCrystal lcd(D0, D1, D2, D3, D4, D5);
////HttpClient
HttpClient http;
http_header_t headers[] = {
// { "Content-Type", "application/json" },
// { "Accept" , "application/json" },
{ "Accept" , "*/*"},
{ NULL, NULL }
};
http_request_t request;
http_response_t response;
void setup() {
Serial.begin(9600);
while(!Serial.available()) SPARK_WLAN_Loop();
Serial.println("Hello!");
lcd.begin(16,2);
lcd.clear();
lcd.setCursor(3, 0);
//lcd.print("Hello, Itay!");
lcd.print("Breezometer");
lcd.setCursor(3, 1);
lcd.print("AQI Station");
//PINs SET
pinMode(RedLED, OUTPUT);
pinMode(GreenLED, OUTPUT);
pinMode(BlueLED, OUTPUT);
pinMode(button, INPUT_PULLDOWN);
}
void loop() {
//its better to wait few secs before the first press after deep sleep or power on
if (!digitalRead(button)) AQI_Check();
}
void AQI_Check(){
//reset the LEDS
digitalWrite(RedLED, LOW);
digitalWrite(GreenLED, LOW);
digitalWrite(BlueLED, LOW);
Serial.println("Asking Breezometer about the air pollution NOW ");
Serial.println(AQI);
lcd.clear();
delay(500);
lcd.setCursor(0, 0);
lcd.print("Breezometer AQI:");
//Serial.println("Application>\tStart of Loop.");
request.hostname = "api-beta.breezometer.com";
request.port = 80;
request.path = "/baqi/?location=Tel+Aviv-Yafo&key=" + token ;
// Get request
http.get(request, response, headers);
String raw_response(response.body);
////////changing the AQI in the response msg to int//////
String statusCode = raw_response.substring(43,45); //the place of the number.
char tensC = raw_response.charAt(43+3); ///FIX the change in answer from USA(3) to Israel(6)
char onesC = raw_response.charAt(44+3); ///FIX the change in answer from USA(3) to Israel(6)
String color = raw_response.substring(43+3+27,44+3+27+5);//the HEX color in the msg: RRGGBB
Serial.println(color);
String Tcolor;
int Rcolor;
int Gcolor;
int Bcolor;
int temp;
char C_color;
//HEX char to INT - Red color
C_color = color[0];
Rcolor = hexToDec(C_color,1);
C_color = color[1];
Rcolor = (hexToDec(C_color,0)) + Rcolor;
Serial.println(Rcolor);
//HEX char to INT - Green color
C_color = color[2];
Gcolor = hexToDec(C_color,1);
C_color = color[3];
Gcolor = (hexToDec(C_color,0)) + Gcolor;
Serial.println(Gcolor);
//HEX char to INT - Blue color
C_color = color[4];
Bcolor = hexToDec(C_color,1);
C_color = color[5];
Bcolor = (hexToDec(C_color,0)) + Bcolor;
Serial.println(Bcolor);
//AQI nuber Char to INT.
int tensI = tensC - '0';
int onesI = onesC - '0';
int AQI = tensI*10+onesI;
/////Write in Serial and LCD
Serial.println("Breezometer AQI:");
Serial.println(AQI);
lcd.clear();
delay(500);
lcd.setCursor(0, 0);
lcd.print("Breezometer AQI:");
if (response.status==200){ //if the status is good write to the LCD
Serial.println("response.status is GOOD");
lcd.setCursor(7, 1);
Serial.println(statusCode);
lcd.print(AQI);
}
else Serial.println("response.status is NOT good");
analogWrite(RedLED, Rcolor);
analogWrite(GreenLED, Gcolor);
analogWrite(BlueLED, Bcolor);
///Trun ON the RGB LIGHT accordingly to the air pollution
if (AQI>65){
delay(3*1000);
lcd.clear();
lcd.setCursor(7, 0);
lcd.print(AQI);
lcd.setCursor(0, 1);
lcd.print("Time To Go Out!");
}
else if (AQI>35){
delay(3*1000);
lcd.clear();
lcd.setCursor(7, 0);
lcd.print(AQI);
lcd.setCursor(3, 1);
lcd.print("Comsi Comsa");
}
else {
delay(3*1000);
lcd.clear();
lcd.setCursor(7, 0);
lcd.print(AQI);
lcd.setCursor(0, 1);
lcd.print("Stay Home...");
}
//Serial.print("Application>\tResponse status: ");
//Serial.println(response.status);
//Serial.print("Application>\tHTTP Response Body: ");
//Serial.println(response.body);
}
int hexToDec(char hexString,int x) {
int decValue = 0;
int tempvalue =0;
if ((hexString != 'A') && (hexString != 'B') && (hexString != 'C') && (hexString != 'D') && (hexString != 'E') && (hexString != 'F')){
int tempvalue = hexString - '0';
if (x==1){
decValue=tempvalue *16;
} else {
decValue=tempvalue + decValue;
}
}
else {
if (hexString == 'A'){
tempvalue=10; }
if (hexString == 'B'){
tempvalue=11; }
if (hexString == 'C'){
tempvalue=12; }
if (hexString == 'D'){
tempvalue=13; }
if (hexString == 'E'){
tempvalue=14; }
if (hexString == 'F'){
tempvalue=15; }
if (x==1){
decValue=tempvalue *16;
} else {
decValue=tempvalue + decValue;
}
}
return decValue;
}
If you have any questions I’ll be happy to answer,
Have fun!
