COMPONENTS :
- ESP8266 WiFi Module
- LED 5mm (red & green)
- Resistor 560-ohm
- 0.96" I2C OLED Display
- Jumper Wires
- Breadboard
How to create the API :
3. Select name of your API
4. In URL paste this https://finance.yahoo.com/quote/BTC-USD/
5. Parse String Paste this
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4. In URL paste this https://finance.yahoo.com/quote/BTC-USD/
5. Parse String Paste this
/html/body/div[1]/div/div/div[1]/div/div[2]/div/div/div[6]/div/div/div/div[3]/div[1]/div/fin-streamer[1]
6.Save ThingHTTP
7. Copy the API KEY
8. Paste the Key in the Code
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Circuit Diagram :
Code :
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Arduino.h>
#include <ESP8266WiFi.h>
#include <ESP8266WiFiMulti.h>
#include <ESP8266HTTPClient.h>
#include <WiFiClient.h>
ESP8266WiFiMulti WiFiMulti;
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#define OLED_RESET -1 // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
#define NUMFLAKES 10 // Number of snowflakes in the animation example
#define LOGO_HEIGHT 32
#define LOGO_WIDTH 32
float v1=0;
float p=0;
String payload;
const unsigned char bitcoinLogo [] PROGMEM = // 'Bitcoin Logo', 128x64px
{
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x60, 0x00, 0x18, 0x00, 0x00, 0xf0, 0x00, 0x60, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x07, 0x03, 0xfe, 0x3c, 0x7e, 0x00, 0x0e, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x03, 0x80, 0x02, 0x3c, 0x40, 0x00, 0x0c, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x01, 0x80, 0x02, 0x24, 0x40, 0x00, 0x1c, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x07, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
void setup() {
pinMode(D5, OUTPUT);
pinMode(D6, OUTPUT);
// SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
Serial.println(F("SSD1306 allocation failed"));
for(;;); // Don't proceed, loop forever
}
Serial.begin(115200);
// Serial.setDebugOutput(true);
Serial.println();
Serial.println();
Serial.println();
for (uint8_t t = 4; t > 0; t--) {
Serial.printf("[SETUP] WAIT %d...\n", t);
Serial.flush();
delay(1000);
}
display.setTextColor(SSD1306_WHITE);
display.clearDisplay(); //Clear the OLED display
display.setTextSize(1);
printCenter("Connecting to WiFi ...", 0, 25);
display.display();
delay(2000);
WiFi.mode(WIFI_STA);
WiFiMulti.addAP("SOUVIKNANDI", "12345679");
display.clearDisplay(); //Clear the OLED display
display.setTextSize(1);
printCenter("Connected", 0, 25);
display.display();
delay(2000);
}
void loop() {
if ((WiFiMulti.run() == WL_CONNECTED)) {
WiFiClient client;
HTTPClient http;
Serial.print("[HTTP] begin...\n");
if (http.begin(client, "https://api.thingspeak.com/apps/thinghttp/send_request?api_key=S4GRX3XD2KRLYHJG")) { // HTTP
Serial.print("[HTTP] GET...\n");
// start connection and send HTTP header
int httpCode = http.GET();
// httpCode will be negative on error
if (httpCode > 0) {
// HTTP header has been send and Server response header has been handled
Serial.printf("[HTTP] GET... code: %d\n", httpCode);
// file found at server
if (httpCode == HTTP_CODE_OK || httpCode == HTTP_CODE_MOVED_PERMANENTLY) {
payload = http.getString();
Serial.println(payload);
String stringTwo = payload;
stringTwo.replace(",", "");
stringTwo.replace(".", "");
long value= stringTwo.toInt();
if(v1==0)
{
v1=value;
}
if(v1!=0 && v1!=value)
{
p=((value-v1)*100)/v1;
v1=value;
}
}
} else {
Serial.printf("[HTTP] GET... failed, error: %s\n", http.errorToString(httpCode).c_str());
}
http.end();
} else {
Serial.printf("[HTTP} Unable to connect\n");
}
}
display.clearDisplay(); //Clear the display
display.setTextColor(SSD1306_WHITE); //Set the text colour to white
display.drawBitmap(0, 0, bitcoinLogo, 128, 64, WHITE); //Display bitmap from array
display.display();
display.clearDisplay();
delay(2000);
String BTCUSDPrice= payload;
display.clearDisplay(); //Clear the OLED display
display.setTextSize(1);
printCenter("BTC/USD", 0, 5);
//Display the comparison header
display.setTextSize(2);
printCenter("$" + BTCUSDPrice, 0, 25);
if(p>0)
{
String str="+ ";
str+=p;
str+=" % ^";
display.setTextSize(1); //Display the change percentage
printCenter(str, 0, 55);
digitalWrite(D6, HIGH);
digitalWrite(D5, LOW);
}
else
{
String str=" ";
str+=p;
str+=" % ";
display.setTextSize(1); //Display the change percentage
printCenter(str, 0, 55);
digitalWrite(D5, HIGH);
digitalWrite(D6, LOW);
}
display.display();
delay(20000);
}
void printCenter(const String buf, int x, int y) //Function to centre the current price in the display width
{
int16_t x1, y1;
uint16_t w, h;
display.getTextBounds(buf, x, y, &x1, &y1, &w, &h); //Calculate string width
display.setCursor((x - w / 2) + (128 / 2), y); //Set cursor to print string in centre
display.print(buf); //Display string
}
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