24 hour percentage // manual?

[TechSplendid]

Maybe not a issue, but do you have to change this code each day to get the right percentage in the code below?

//Display 24hr. Percent Change
double yesterdayPrice = historyDoc["bpi"]["2021-03-20"].as();

[AndrewBudziszek]

@Tenderlaan54 Hi! Thanks for checking out this project. Yeah, as of right now it is manual. If you're interested, you could look into something like this https://randomnerdtutorials.com/esp8266-nodemcu-date-time-ntp-client-server-arduino/ to help get the date and generate the string to put in for the lookup.

If you do, please submit a merge request and I'd be more than happy to add your code to the project!

[TechSplendid]

I tried but I can't get the correct format of the date. The format in the link you gave is: 2021-8-3 instead of 2021-08-03.

Isn't it possible and easier to get this info from the api call?

[TechSplendid]

I don't know how to submit a merge request. So i will post my code here below.
You will need this library that i modified for this. Maybe there are better way's butt i am new @ coding.

////// my library //////
https://github.com/TechSplendid/ESP8266-NTP-Yesterday-library

///// The code i use /////

#include <Adafruit_SSD1306.h>
#include <Wire.h>
#include "NTPClientYesterday.h"
#include <ESP8266WiFi.h>
#include <WiFiUdp.h>
#include <ESP8266HTTPClient.h>
#include <ArduinoJson.h>
//#include "secrets.h" // WiFi Configuration (WiFi name and Password)
#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);

//const char* ssid = SECRET_SSID;
//const char* password = SECRET_WIFI_PASSWORD;

const char* ssid = "SECRET_SSID";
const char* password = "SECRET_WIFI_PASSWORD";

const long utcOffsetInSeconds = -28800;

// Powered by CoinDesk - https://www.coindesk.com/price/bitcoin
const String url = "http://api.coindesk.com/v1/bpi/currentprice/BTC.json";
const String historyURL = "http://api.coindesk.com/v1/bpi/historical/close.json";
const String cryptoCode = "BTC";

// 'icons8-bitcoin-24', 24x24px
const unsigned char bitcoinIcon [] PROGMEM = {
0x00, 0x7e, 0x00, 0x03, 0xff, 0xc0, 0x07, 0x81, 0xe0, 0x0e, 0x00, 0x70, 0x18, 0x28, 0x18, 0x30,
0x28, 0x0c, 0x70, 0xfc, 0x0e, 0x60, 0xfe, 0x06, 0x60, 0xc7, 0x06, 0xc0, 0xc3, 0x03, 0xc0, 0xc7,
0x03, 0xc0, 0xfe, 0x03, 0xc0, 0xff, 0x03, 0xc0, 0xc3, 0x83, 0xc0, 0xc1, 0x83, 0x60, 0xc3, 0x86,
0x60, 0xff, 0x06, 0x70, 0xfe, 0x0e, 0x30, 0x28, 0x0c, 0x18, 0x28, 0x18, 0x0e, 0x00, 0x70, 0x07,
0x81, 0xe0, 0x03, 0xff, 0xc0, 0x00, 0x7e, 0x00
};

HTTPClient http;
String lastPrice;

WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, "pool.ntp.org", utcOffsetInSeconds);

void setup() {
Serial.begin(115200);

timeClient.begin();

// Set offset time in seconds to adjust for your timezone, for example:
// GMT +1 = 3600
// GMT +8 = 28800
// GMT -1 = -3600
// GMT 0 = 0
timeClient.setTimeOffset(7200); // Netherlands

if (!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
Serial.println(F("SSD1306 allocation failed"));
for (;;); // Don't proceed, loop forever
}

display.clearDisplay();
display.setTextSize(1);
display.setTextColor(SSD1306_WHITE);
display.setCursor(0,0);
display.println("Connecting to WiFi...");
display.display();

WiFi.begin(ssid, password);

while (WiFi.status() != WL_CONNECTED)
{
delay(500);
}

Serial.print("CONNECTED to SSID: ");
Serial.println(ssid);

display.print("Connected to ");
display.println(ssid);
display.display();
delay(5000);
}

void loop() {

timeClient.update();

if (WiFi.status() == WL_CONNECTED) {
Serial.println("Getting current data...");

http.begin(url);
int httpCode = http.GET();
Serial.print("HTTP Code: ");
Serial.println(httpCode);
if (httpCode > 0) {
  StaticJsonDocument<768> doc;
  DeserializationError error = deserializeJson(doc, http.getString());

  if (error) {
    Serial.print(F("deserializeJson failed: "));
    Serial.println(error.f_str());
    delay(2500);
    return;
  }

  Serial.print("HTTP Status Code: ");
  Serial.println(httpCode);

  String BTCUSDPrice = doc["bpi"]["USD"]["rate_float"].as<String>();
  if(BTCUSDPrice == lastPrice) {
    Serial.print("Price hasn't changed (Current/Last): ");
    Serial.print(BTCUSDPrice);
    Serial.print(" : ");
    Serial.println(lastPrice);
    delay(1250);
    return;
  } else {
    lastPrice = BTCUSDPrice;
  }
  String lastUpdated = doc["time"]["updated"].as<String>();
  http.end();

  Serial.println("Getting history...");
  StaticJsonDocument<1536> historyDoc;
  http.begin(historyURL);
  int historyHttpCode = http.GET();
  DeserializationError historyError = deserializeJson(historyDoc, http.getString());

  if (historyError) {
    Serial.print(F("deserializeJson(History) failed: "));
    Serial.println(historyError.f_str());
    delay(2500);
    return;
  }

  //Display Header

// display.clearDisplay();
// display.setTextSize(1);
// printCenter("BTC/USD", 0, 0);
display.clearDisplay();
display.drawBitmap((128/2) - (24/2), 0, bitcoinIcon, 24, 24, WHITE);
display.display();

  //Display BTC Price
  display.setTextSize(2);
  printCenter("$" + BTCUSDPrice, 0, 32);

  //Display 24hr. Percent Change
  double yesterdayPrice = historyDoc["bpi"][timeClient.getFormattedDate()].as<double>();
  bool isUp = BTCUSDPrice.toDouble() > yesterdayPrice;
  double percentChange;
  String dayChangeString = "24hr. Change: ";
  if (isUp) {
    percentChange = ((BTCUSDPrice.toDouble() - yesterdayPrice) / yesterdayPrice) * 100;
  } else {
    percentChange = ((yesterdayPrice - BTCUSDPrice.toDouble()) / yesterdayPrice) * 100;
    dayChangeString = dayChangeString + "-";
  }
  display.setTextSize(1);
  dayChangeString = dayChangeString + percentChange + "%";
  printCenter(dayChangeString, 0, 55);

  display.display();
  http.end();
}
delay(1250);

}
}

void printCenter(const String buf, int x, int y)
{
int16_t x1, y1;
uint16_t w, h;
display.getTextBounds(buf, x, y, &x1, &y1, &w, &h); //calc width of new string
display.setCursor((x - w / 2) + (128 / 2), y);
display.print(buf);
}