Demonstration Video

The device updates itself every hour. 

All the components fit inside the casing. The original version was meant to have a 9v battery fit inside to power the device, but it was found that a micro USB cable is more power efficient.  

/*Crypto Tracker e-paper display Project 
 * 
 * By: Matteo Fazio
 * 2021
*/

//Wifi
#include <WiFi.h>
#include <Wire.h>

//Reading from coindesk
#include <ArduinoJson.h>
#include "arduino_secrets.h"

//Dispay 
#include <GxEPD2_BW.h>
#include <Fonts/FreeMonoBold12pt7b.h>
#include <U8g2_for_Adafruit_GFX.h>
//#include "imagedata.h"
// 1,54" 200x200 V2 (new):ESP32:
GxEPD2_BW<GxEPD2_154_D67, GxEPD2_154_D67::HEIGHT> display(GxEPD2_154_D67(26, 25, 33, 27)); // CS, DC, RST, Busy, clk =18 // GDEH0154D67

U8G2_FOR_ADAFRUIT_GFX u8g2Fonts;


double refreshRate = 3600000000;
// 900000 = 15mins
//3600000000 = 1 hour 

// WiFi settings
const char* ssid  = SECRET_SSID;
const char* password = SECRET_PASS;                   
                                                                  
const char* host = "api.coindesk.com"; // API server

int price = 0;
//int previousPrice =0;


 
void setup() {
 
  // Serial
  Serial.begin(115200);
  delay(10);
 
  //Connecting to a WiFi network
  Serial.println();
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  
  WiFi.begin(ssid, password);
  
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");

    
   // Initialize display
  display.init();
  display.setFullWindow();
  
  }
 
  Serial.println("");
  Serial.println("WiFi connected");  
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}


/*
String priceTrend(int price, int previousPrice){
  
  String trend = "";
  if(price > previousPrice)
    return trend =  "^";
  else
    return trend = "v";    

  Serial.print(trend);
  }
*/

//const char BitcoinPrice[] = "BitcoinPrice: ";


void displayBTC(float price){
  
  String priceString = String(price, 0);
  String BTC = "BTC $";
  //String trend = priceTrend(price, previousPrice);
  String BitcoinPrice = BTC + priceString;
  // + trend

  
  display.setRotation(1);
  display.setFont(&FreeMonoBold12pt7b);
  //u8g2Fonts.setFont(u8g2_font_logisoso34_tf);
  display.setTextColor(GxEPD_BLACK);
  int16_t tbx, tby; uint16_t tbw, tbh;
  display.getTextBounds(BitcoinPrice, 0, 0, &tbx, &tby, &tbw, &tbh);
  // center the bounding box by transposition of the origin:
  uint16_t x = ((display.width() - tbw) / 2) - tbx;
  uint16_t y = ((display.height() - tbh) / 2) - tby;
  display.setFullWindow();
  display.firstPage();
  do{
    display.fillScreen(GxEPD_WHITE);
    display.setCursor(x, y);
    display.print(BitcoinPrice);
  }while (display.nextPage());
}


int attempts = 0;

void loop() {         //__main___
 
  // Connect to API
  Serial.print("connecting to ");
  Serial.println(host);
  
 // Use WiFiClient class to create TCP connections
  WiFiClient client;
  const int httpPort = 80;
  if (!client.connect(host, httpPort)) {
    Serial.println("connection failed");
    return;
  }
  
  //Create a URI for the request
  String url = "/v1/bpi/currentprice.json";
  //http://api.coindesk.com/v1/bpi/currentprice/BTC.json
  Serial.print("Requesting URL: ");
  Serial.println(url);
  
   //Ssend the request to the server
  client.print(String("GET ") + url + " HTTP/1.1\r\n" +
               "Host: " + host + "\r\n" + 
               "Connection: close\r\n\r\n");
  delay(100);
  
// Read all the lines of the reply from server and print them to Serial
  String answer;
  while(client.available()){
    String line = client.readStringUntil('\r');
    answer += line;
  }
 
  client.stop();
  Serial.println();
  Serial.println("closing connection");
 
  // Process answer
  Serial.println();
  Serial.println("Answer: ");
  Serial.println(answer);
 
 // Convert to JSON
  String jsonAnswer;
  int jsonIndex;
 
  for (int i = 0; i < answer.length(); i++) {
    if (answer[i] == '{') {
      jsonIndex = i;
      break;
    }
  }
 
  // Get JSON data
  jsonAnswer = answer.substring(jsonIndex);
  Serial.println();
  Serial.println("JSON answer: ");
  Serial.println(jsonAnswer);
  jsonAnswer.trim();
 
  // Get rate as float
  int rateIndex...