Ik Wil Crypto Prijzen Up To Date

#include <Arduino.h>
#include <Wire.h>
#include <WiFi.h>
#include <HTTPClient.h>
#include <ArduinoJson.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SH110X.h>

// ─── WiFi instellingen ────────────────────────────────────────────────────────
#define WIFI_SSID   "JouwWiFiNaam"
#define WIFI_PASS   "JouwWiFiWachtwoord"

// ─── OLED ────────────────────────────────────────────────────────────────────
#define SCREEN_WIDTH  128
#define SCREEN_HEIGHT 64
#define OLED_RESET    -1
#define SDA_PIN       21
#define SCL_PIN       22


// Forward declarations
void showConnecting();
void showError(const char* msg);
void fetchPrices();
void drawCoin(int idx);

Adafruit_SH1106G display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

// ─── Crypto configuratie ──────────────────────────────────────────────────────
const char* COIN_IDS[]     = {"bitcoin", "ethereum", "solana", "ripple"};
const char* COIN_SYMBOLS[] = {"BTC", "ETH", "SOL", "XRP"};
const int   NUM_COINS      = 4;

float  prices[NUM_COINS]  = {0, 0, 0, 0};
float  changes[NUM_COINS] = {0, 0, 0, 0};
bool   dataLoaded         = false;

// ─── Timing ───────────────────────────────────────────────────────────────────
const unsigned long FETCH_INTERVAL   = 60000;  // Prijs update: elke 60 seconden
const unsigned long DISPLAY_INTERVAL = 4000;   // Wisselen coin: elke 4 seconden

unsigned long lastFetch   = 0;
unsigned long lastDisplay = 0;
int           currentCoin = 0;

// ─── Functies ─────────────────────────────────────────────────────────────────
void showConnecting() {
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SH110X_WHITE);
  display.setCursor(10, 20);
  display.print("Verbinden met WiFi");
  display.setCursor(30, 35);
  display.print(WIFI_SSID);
  display.display();
}

void showError(const char* msg) {
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SH110X_WHITE);
  display.setCursor(0, 10);
  display.print("Fout:");
  display.setCursor(0, 24);
  display.print(msg);
  display.display();
}

void fetchPrices() {
  if (WiFi.status() != WL_CONNECTED) return;

  HTTPClient http;
  String url = "https://api.coingecko.com/api/v3/simple/price"
               "?ids=bitcoin,ethereum,solana,ripple"
               "&vs_currencies=usd"
               "&include_24hr_change=true";

  http.begin(url);
  http.addHeader("Accept", "application/json");
  int httpCode = http.GET();

  if (httpCode == 200) {
    String payload = http.getString();
    JsonDocument doc;
    DeserializationError err = deserializeJson(doc, payload);
    if (!err) {
      prices[0]  = doc["bitcoin"]["usd"]             | 0.0f;
      changes[0] = doc["bitcoin"]["usd_24h_change"]  | 0.0f;
      prices[1]  = doc["ethereum"]["usd"]            | 0.0f;
      changes[1] = doc["ethereum"]["usd_24h_change"] | 0.0f;
      prices[2]  = doc["solana"]["usd"]              | 0.0f;
      changes[2] = doc["solana"]["usd_24h_change"]   | 0.0f;
      prices[3]  = doc["ripple"]["usd"]              | 0.0f;
      changes[3] = doc["ripple"]["usd_24h_change"]   | 0.0f;
      dataLoaded = true;
    }
  } else {
    // Toon foutcode maar overschrijf niet de bestaande data
  }
  http.end();
}

void drawCoin(int idx) {
  display.clearDisplay();

  // ── Bovenbalk: naam + nummer ──
  display.fillRect(0, 0, SCREEN_WIDTH, 14, SH110X_WHITE);
  display.setTextColor(SH110X_BLACK);
  display.setTextSize(1);
  display.setCursor(4, 3);
  display.print(COIN_SYMBOLS[idx]);

  // Paginatje rechtsboven  "2/4"
  char page[6];
  snprintf(page, sizeof(page), "%d/%d", idx + 1, NUM_COINS);
  display.setCursor(SCREEN_WIDTH - 22, 3);
  display.print(page);

  display.setTextColor(SH110X_WHITE);

  if (!dataLoaded) {
    display.setTextSize(1);
    display.setCursor(10, 28);
    display.print("Laden...");
    display.display();
    return;
  }

  // ── Prijs ──
  char priceStr[20];
  if (prices[idx] >= 10000.0f) {
    snprintf(priceStr, sizeof(priceStr), "$%.0f", prices[idx]);
  } else if (prices[idx] >= 100.0f) {
    snprintf(priceStr, sizeof(priceStr), "$%.2f", prices[idx]);
  } else {
    snprintf(priceStr, sizeof(priceStr), "$%.4f", prices[idx]);
  }

  display.setTextSize(2);
  // Centreer de prijs
  int16_t x1, y1; uint16_t w, h;
  display.getTextBounds(priceStr, 0, 0, &x1, &y1, &w, &h);
  display.setCursor((SCREEN_WIDTH - w) / 2, 18);
  display.print(priceStr);

  // ── 24u verandering ──
  display.setTextSize(1);
  char changeStr[16];
  float ch = changes[idx];
  snprintf(changeStr, sizeof(changeStr), "%s%.2f%%", ch >= 0 ? "+" : "", ch);

  display.getTextBounds(changeStr, 0, 0, &x1, &y1, &w, &h);
  display.setCursor((SCREEN_WIDTH - w) / 2, 44);
  display.print(changeStr);

  // ── Onderste lijn: "24u verandering" label ──
  display.setTextSize(1);
  display.setCursor(20, 55);
  display.print("24u verandering");

  display.display();
}

// ─── Setup ───────────────────────────────────────────────────────────────────
void setup() {
  Serial.begin(115200);

  Wire.begin(SDA_PIN, SCL_PIN);
  display.begin(0x3C, true);
  display.clearDisplay();
  display.display();

  showConnecting();

  WiFi.begin(WIFI_SSID, WIFI_PASS);
  int attempts = 0;
  while (WiFi.status() != WL_CONNECTED && attempts < 40) {
    delay(500);
    attempts++;
  }

  if (WiFi.status() != WL_CONNECTED) {
    showError("Geen WiFi");
    return;
  }

  fetchPrices();
  lastFetch   = millis();
  lastDisplay = millis();
  drawCoin(currentCoin);
}

// ─── Loop ────────────────────────────────────────────────────────────────────
void loop() {
  unsigned long now = millis();

  // Haal elke 60 seconden nieuwe prijzen op
  if (now - lastFetch >= FETCH_INTERVAL) {
    fetchPrices();
    lastFetch = now;
    drawCoin(currentCoin);   // Meteen scherm verversen na update
  }

  // Wissel elke 4 seconden naar de volgende coin
  if (now - lastDisplay >= DISPLAY_INTERVAL) {
    currentCoin = (currentCoin + 1) % NUM_COINS;
    drawCoin(currentCoin);
    lastDisplay = now;
  }
}