Error on Display, "Error Loading Data" (code below)

[idonthaveklutch]

/******************************************************************* A project to display crypto currency prices using an ESP8266

Main Hardware:
- NodeMCU Development Board (Any ESP8266 dev board will work)
- OLED I2C Display (SH1106)

Written by Brian Lough
https://www.youtube.com/channel/UCezJOfu7OtqGzd5xrP3q6WA

*******************************************************************/

// ---------------------------- // Standard Libraries - Already Installed if you have ESP8266 set up // ----------------------------

#include <ESP8266WiFi.h> #include <WiFiClientSecure.h> #include <Wire.h>

// ---------------------------- // Additional Libraries - each one of these will need to be installed. // ----------------------------

#include <CoinMarketCapApi.h> // For Integrating with the CoinMarketCap.com API // Available on the library manager (Search for "CoinMarket") // https://github.com/witnessmenow/arduino-coinmarketcap-api

#include "SH1106.h" // The driver for the OLED display // Available on the library manager (Search for "esp8266 oled driver") // https://github.com/squix78/esp8266-oled-ssd1306

#include <ArduinoJson.h> // !! NOTE !!: When installing this select an older version than V6 from the drop down // Required by the CoinMarketCapApi Library for parsing the response // Available on the library manager (Search for "arduino json") //https://github.com/bblanchon/ArduinoJson

// ---------------------------- // Configurations - Update these // ----------------------------

char ssid[] = "Jon's Wi-Fi Network"; // your network SSID (name) char password[] = "Ruuskahouse1"; // your network key

// Pins based on your wiring #define SCL_PIN 14 #define SDA_PIN 0

// CoinMarketCap's limit is "no more than 10 per minute" // Make sure to factor in if you are requesting more than one coin. // We'll request a new value just before we change the screen so it's the most up to date unsigned long screenChangeDelay = 10000; // Every 10 seconds

// Have tested up to 10, can probably do more #define MAX_HOLDINGS 10

#define CURRENCY "usd" //See CoinMarketCap.com for currency options (usd, gbp etc) #define CURRENCY_SYMBOL "$" // Euro doesn't seem to work, $ and £ do

// You also need to add your crypto currecnies in the setup function

// ---------------------------- // End of area you need to change // ----------------------------

WiFiClientSecure client; CoinMarketCapApi api(client);

SH1106 display(0x3c, SDA_PIN, SCL_PIN);

unsigned long screenChangeDue;

struct Holding { String tickerId; float amount; bool inUse; CMCTickerResponse lastResponse; };

Holding holdings[MAX_HOLDINGS];

int currentIndex = -1; String ipAddressString;

void addNewHolding(String tickerId, float amount = 0) { int index = getNextFreeHoldingIndex(); if (index > -1) { holdings[index].tickerId = tickerId; holdings[index].amount = amount; holdings[index].inUse = true; } }

void setup() {

Serial.begin(115200);

// ---------------------------- // Holdings - Add your currencies here // ---------------------------- // Go to the currencies coinmarketcap.com page // and take the tickerId from the URL (use bitcoin or ethereum as an example)

addNewHolding("bitcoin"); addNewHolding("dogecoin"); addNewHolding("ripple");

// ---------------------------- // Everything below can be thinkered with if you want but should work as is! // ----------------------------

// Initialising the display display.init(); display.setTextAlignment(TEXT_ALIGN_CENTER); display.setFont(ArialMT_Plain_16); display.drawString(64, 0, F("HODL Display")); display.setFont(ArialMT_Plain_10); display.drawString(64, 18, F("By Brian Lough")); display.display();

// Set WiFi to station mode and disconnect from an AP if it was Previously // connected WiFi.mode(WIFI_STA); WiFi.disconnect(); delay(100);

// Attempt to connect to Wifi network: Serial.print("Connecting Wifi: "); Serial.println(ssid); WiFi.begin(ssid, password); while (WiFi.status() != WL_CONNECTED) { Serial.print("."); delay(500); } Serial.println(""); Serial.println("WiFi connected"); Serial.println("IP address: "); IPAddress ip = WiFi.localIP(); Serial.println(ip); ipAddressString = ip.toString(); }

int getNextFreeHoldingIndex() { for (int i = 0; i < MAX_HOLDINGS; i++) { if (!holdings[i].inUse) { return i; } }

return -1; }

int getNextIndex() { for (int i = currentIndex + 1; i < MAX_HOLDINGS; i++) { if (holdings[i].inUse) { return i; } }

for (int j = 0; j <= currentIndex; j++) { if (holdings[j].inUse) { return j; } }

return -1; }

void displayHolding(int index) {

CMCTickerResponse response = holdings[index].lastResponse;

display.clear();

display.setTextAlignment(TEXT_ALIGN_CENTER); display.setFont(ArialMT_Plain_16); display.drawString(64, 0, response.symbol); display.setFont(ArialMT_Plain_24); double price = response.price_currency; if (price == 0) { price = response.price_usd; } display.drawString(64, 20, formatCurrency(price)); display.setFont(ArialMT_Plain_16); // display.setTextAlignment(TEXT_ALIGN_CENTER); // display.drawString(64, 48, " 1h:" + String(response.percent_change_1h) + "%"); display.setTextAlignment(TEXT_ALIGN_CENTER); display.drawString(64, 48, "24h: " + String(response.percent_change_24h) + "%");

display.display(); }

void displayMessage(String message){ display.clear(); display.setFont(ArialMT_Plain_10); display.setTextAlignment(TEXT_ALIGN_LEFT); display.drawStringMaxWidth(0, 0, 128, message); display.display(); }

String formatCurrency(float price) { String formattedCurrency = CURRENCY_SYMBOL; int pointsAfterDecimal = 6; if (price > 100) { pointsAfterDecimal = 2; } else if (price > 1) { pointsAfterDecimal = 4; } formattedCurrency.concat(String(price, pointsAfterDecimal)); return formattedCurrency; }

bool loadDataForHolding(int index) { int nextIndex = getNextIndex(); if (nextIndex > -1 ) { holdings[index].lastResponse = api.GetTickerInfo(holdings[index].tickerId, CURRENCY); return holdings[index].lastResponse.error == ""; }

return false; }

void loop() { unsigned long timeNow = millis(); if ((timeNow > screenChangeDue)) { currentIndex = getNextIndex(); if (currentIndex > -1) { if (loadDataForHolding(currentIndex)) { displayHolding(currentIndex); } else { displayMessage(F("Error loading data.")); } } else { displayMessage(F("No funds to display. Edit the setup to add them")); } screenChangeDue = timeNow + screenChangeDelay; } }