'Why is this arduino esp32 code not working?
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
Solution 1:[1]
The error in the code is that you are parsing the wrong document, for the ADA case. You are parsing the BTC doc instead of the ADA doc. In the following line, you should pass doc1 as parameter, but you are passing the document that was received from the BTC url, doc.
Change
DeserializationError error1 = deserializeJson(doc, http.getString());
to
DeserializationError error1 = deserializeJson(doc1, http.getString());
Solution 2:[2]
You will need to do an ICE Restart. You do this by calling restartIce and then generating a new offer for web.
See this answer for a specific android answer.
Sources
This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.
Source: Stack Overflow
| Solution | Source |
|---|---|
| Solution 1 | mmixLinus |
| Solution 2 | Sean DuBois |