I am a beginner to programming
I am trying to program an ESP32 to show Bitcoin and Cardano price on an Adafruit SSD1306 128x64 OLED display based on the youtube video https://youtu.be/1Xas_UCOMvQ, I want to show more than one crypto currency (bitcoin and cardano) but couldn't find a code for that so tried to do it myself by combining two codes from two guys (sources are mentioned below), when I tried to run it is showing bitcoin price but for cardano it is showing "null".
Can you tell me why it is not showing cardano price?
code is given below
//Bitcoin and Cardano Ticker
//Modified with codes from Michael Klements original version "https://www.the-diy-life.com/bitcoin-ticker-using-an-esp32-and-oled-display/"
("https://youtu.be/1Xas_UCOMvQ")and Vincent Rubens "https://github.com/xreactx/CryptoTicker/blob/main/CryptoTickerADA.ino"
//to include the Bitcoin logo and IO for the red and green indicator LEDs
#include <Adafruit_SSD1306.h> //Include the required libraries
#include <WiFi.h>
#include <Wire.h>
#include <HTTPClient.h>
#include <NTPClient.h>
#include <WiFiUdp.h>
#include <ArduinoJson.h>
#define SCREEN_WIDTH 128 //Define the OLED display width and height
#define SCREEN_HEIGHT 64
#define OLED_RESET -1 // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C //I2C address for display
#define upLED 13
#define downLED 12
Adafruit_SSD1306 display (SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET); //Create the display object
const char* ssid = "Your wifi name"; //Set your WiFi network name and password
const char* password = "your wifi password";
const int httpsPort = 443; //Bitcoin price API 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";
const String url1 = "https://api.coingecko.com/api/v3/simple/price?ids=cardano&vs_currencies=usd&include_24hr_change=true";
//Cardano price API powered by CoinDesk - https://www.coingecko.com/
WiFiClient client; //Create a new WiFi client
HTTPClient http;
String formattedDate; //Create variables to store the date and time
String dayStamp;
String timeStamp;
const unsigned char bitcoinLogo [] PROGMEM = // 'Bitcoin Logo', 128x64px
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};
void setup()
{
Serial.begin(115200); //Start the serial monitor
pinMode(upLED, OUTPUT); //Define the LED pin outputs
pinMode(downLED, OUTPUT);
if (!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) //Connect to the display
{
Serial.println(F("SSD1306 allocation failed"));
for (;;); // Don't proceed, loop forever
}
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();
delay(2000);
display.clearDisplay(); //Clear the display
display.setTextSize(1); //Set display parameters
display.setTextColor(WHITE);
display.println("Connecting to WiFi...");
display.display();
WiFi.begin(ssid, password);
Serial.print("Connecting to WiFi...");
while (WiFi.status() != WL_CONNECTED) //Connect to the WiFi network
{
delay(500);
Serial.print(".");
}
Serial.println();
display.println("Connected to: "); //Display message once connected
display.print(ssid);
display.display();
delay(1500);
display.clearDisplay();
display.display();
}
void loop()
{
Serial.print("Connecting to "); //Display url on Serial monitor for debugging
Serial.println(url);
http.begin(url);
int httpCode = http.GET(); //Get crypto price from API
StaticJsonDocument<2000> doc;
DeserializationError error = deserializeJson(doc, http.getString());
if (error) //Display error message if unsuccessful
{
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>(); //Store crypto price and update date in local variables
String lastUpdated = doc["time"]["updated"].as<String>();
http.end();
Serial.print("Getting history...");
StaticJsonDocument<2000> historyDoc;
http.begin(historyURL); //Get historical crypto price from API
int historyHttpCode = http.GET();
DeserializationError historyError = deserializeJson(historyDoc, http.getString());
if (historyError) { //Display error message if unsuccessful
Serial.print(F("deserializeJson(History) failed"));
Serial.println(historyError.f_str());
delay(2500);
return;
}
Serial.print("History HTTP Status Code: ");
Serial.println(historyHttpCode);
JsonObject bpi = historyDoc["bpi"].as<JsonObject>();
double yesterdayPrice;
for (JsonPair kv : bpi) {
yesterdayPrice = kv.value().as<double>(); //Store yesterday's crypto price
}
Serial.print("BTCUSD Price: "); //Display current price on serial monitor
Serial.println(BTCUSDPrice.toDouble());
Serial.print("Yesterday's Price: "); //Display yesterday's price on serial monitor
Serial.println(yesterdayPrice);
bool isUp = BTCUSDPrice.toDouble() > yesterdayPrice; //Check whether price has increased or decreased
double percentChange;
String dayChangeString = "24hr. Change: ";
if (isUp) //If price has increased from yesterday
{
percentChange = ((BTCUSDPrice.toDouble() - yesterdayPrice) / yesterdayPrice) * 100;
digitalWrite(upLED, HIGH);
digitalWrite(downLED, LOW);
}
else //If price has decreased from yesterday
{
percentChange = ((yesterdayPrice - BTCUSDPrice.toDouble()) / yesterdayPrice) * 100;
dayChangeString = dayChangeString + "-";
digitalWrite(downLED, HIGH);
digitalWrite(upLED, LOW);
}
Serial.print("Percent Change: "); //Display the percentage change on the serial monitor
Serial.println(percentChange);
display.clearDisplay(); //Clear the OLED display
display.setTextSize(1);
printCenter("BTC/USD", 0, 0); //Display the comparison header
display.setTextSize(2);
printCenter("$" + BTCUSDPrice, 0, 25); //Display the current price
display.setTextSize(1); //Display the change percentage
dayChangeString = dayChangeString + percentChange + "%";
printCenter(dayChangeString, 0, 55);
display.display(); //Execute the new display
display.clearDisplay();
delay(5000); //Execute the new display
Serial.print("Connecting to "); //Display url11 on Serial monitor for debugging
Serial.println(url1);
http.begin(url1);
int httpCode1 = http.GET(); //Get crypto price from API
StaticJsonDocument<2000> doc1;
DeserializationError error1 = deserializeJson(doc, http.getString());
if (error) //Display error message if unsuccessful
{
Serial.print(F("deserializeJson Failed"));
Serial.println(error1.f_str());
delay(2500);
return;
}
Serial.print("HTTP Status Code: ");
Serial.println(httpCode1);
//Get crypto price from API
String ADAUSDPrice = doc1["cardano"]["usd"].as<String>(); //Store crypto price and update date in local variables
String percentChange1 = doc1["cardano"]["usd_24h_change"].as<String>();
percentChange1.remove(4); //Adjust the decimal placement
http.end();
Serial.print("ADAUSD Price: "); //Display current price on serial monitor
bool isup1 = percentChange1 > "0"; //Check whether price has increased or decreased
String dayChange1String = "24hr. Change: ";
if (isup1) //If price has increased from yesterday
{
percentChange1 >= "0";
digitalWrite(upLED, HIGH);
digitalWrite(downLED, LOW);
}
else //If price has decreased from yesterday
{
percentChange1 < "0";
digitalWrite(downLED, HIGH);
digitalWrite(upLED, LOW);
}
Serial.print("Percent Change: "); //Display the percentage change on the serial monitor
Serial.println(percentChange1);
display.clearDisplay(); //Clear the OLED display
display.setTextSize(1);
printCenter("ADA/USD", 0, 0); //Display the comparison header
display.setTextSize(2);
printCenter("$" + ADAUSDPrice, 0, 20); //Display the current price
display.setTextSize(1); //Display the change percentage
dayChange1String = dayChange1String + percentChange1 + "%";
printCenter(dayChange1String, 0, 55);
display.display(); //Execute the new display
display.clearDisplay();
delay(5000);
http.end(); //End the WiFi connection
esp_sleep_enable_timer_wakeup(900000000); //Sleep for 15 minutes
}
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
}
images are given below
