Release v0.1

Author: Sgoldik

README.md

@@ -1 +1,62 @@
-# arduino-crypto-tracker
+
+# arduino-crypto-tracker
+It works only with the price of bitcoin (coindesk API), in the future it is planned to transfer to the coinmarketcap API.
+
+## Components
+* Arduino Uno
+* ESP8266 (ESP01)
+* 1602A LCD
+* Wires
+
+## Libs
+* ESP8266WiFi
+* ArduinoJson
+* SoftwareSerial
+* LiquidCrystal_I2C
+
+## ESP8266 Firmware
+Connection diagram for ESP8266 firmware:
+|ESP8266|ARDUINO UNO  |
+|--|--|
+|GND  |GND  |
+|VIN|3.3v  |
+|ENABLE|3.3v  |
+|TX|TX  |
+|RX|RX  |
+|RESET|GND  |
+
+> It is also necessary to close reset and gnd on the arduino.
+
+Next, you need to hold down the reset button on the arduino and connect the arduino to the PC, after you hear that the USB-device is connected, you can release the button.
+
+To update the ESP8266 firmware, you need to perform a number of manipulations with the Arduino IDE development environment.
+1. Open the **/api/api.ino** file, configure the wi-fi network
+2. Open **File** -> **Preferences** -> paste the link into the **Additional Board Manager URLs** http://arduino.esp8266.com/stable/package_esp8266com_index.json
+3. Open **Tools** -> **Boards** -> **ESP8266 Boards** -> **Generic ESP8266 Module**
+4. Install **ArduinoJson** library (**Tools** -> **Manage Libraries** -> Find and install)
+5. Compile and upload it to ESP8266.
+6. Profit!
+
+## Final connection diagram
+Connection diagram for ESP8266 firmware:
+|ESP8266|ARDUINO UNO  |
+|--|--|
+|GND  |GND  |
+|VIN|3.3v  |
+|ENABLE|3.3v  |
+|TX|Serial 3  |
+|RX|Serial 2  |
+
+|LCD 1602A|ARDUINO UNO  |
+|--|--|
+|GND  |GND  |
+|VCC|5v  |
+|SDA|A4  |
+|SCL|A5 |
+Update Arduino Uno firmware:
+
+1. Open the **/main/main.ino** file
+2. Open **Tools** -> **Boards** -> **Arduino AVR Board** -> **Arduino Uno**
+3. Install **LiquidCrystal_I2C** library (**Tools** -> **Manage Libraries** -> Find and install)
+4. Compile and upload it to ESP8266.
+5. Profit!

api/api.ino

@@ -0,0 +1,71 @@
+#include <ArduinoJson.h>
+#include <ESP8266WiFi.h>
+
+const char* ssid = "TP-Link_408";
+const char* password = "84570550";
+
+#define CD_API "/v1/bpi/currentprice.json"
+#define CD_URL "api.coindesk.com"
+
+static char respBuffer[4096];
+WiFiClient client;
+
+void setup() {
+  Serial.begin(115200);
+  delay(10);
+  Serial.print("Connecting to ");
+  Serial.println(ssid);
+  WiFi.begin(ssid, password);
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.print(".");
+  }
+  Serial.println("WiFi connected");
+  Serial.print("IP address: ");
+  Serial.println(WiFi.localIP());
+}
+
+void loop() {
+  getData();
+  delay(7650);
+}
+
+void getData() {
+  const char request[] =
+  "GET " CD_API " HTTP/1.1\r\n"
+  "User-Agent: ESP8266/0.1\r\n"
+  "Accept: */*\r\n"
+  "Host: " CD_URL "\r\n"
+  "Connection: close\r\n"
+  "\r\n";
+  delay(100);
+
+  if (!client.connect(CD_URL, 80)) {
+    Serial.println("Connection failed");
+    return;
+  }
+
+  client.print(request);
+  client.flush();
+  delay(1000);
+  uint16_t index = 0;
+  while(client.connected() || client.available()) {
+    if(client.available()) {
+      respBuffer[index++] = client.read();
+      delay(1);
+    }
+  }
+
+  char * json = strchr(respBuffer,'{');
+  String json_str = String(json);
+  uint16_t idx_d = json_str.lastIndexOf('d');
+  json_str.remove(idx_d,3);
+  DynamicJsonDocument doc(1024);
+  DeserializationError error = deserializeJson(doc, json);
+
+  JsonObject bpi = doc["bpi"];
+  JsonObject usd = bpi["USD"];
+  String rate_float = usd["rate_float"];
+
+  Serial.print(rate_float);
+}

main/main.ino

@@ -0,0 +1,42 @@
+#include <SoftwareSerial.h>
+#include <LiquidCrystal_I2C.h>
+
+SoftwareSerial esp8266(3, 2);
+LiquidCrystal_I2C lcd(0x27,16,2);
+
+void setup() {
+  Serial.begin(115200);
+  Serial.println("Started");
+
+  esp8266.begin(115200);
+
+  lcd.init();                     
+  lcd.backlight();
+  lcd.print("Bitcoin");
+  
+}
+
+String strData = "";
+boolean recievedFlag;
+
+void loop() {
+
+  while (esp8266.available() > 0) { 
+    strData += (char)esp8266.read();
+    recievedFlag = true;
+    delay(2);
+  }
+
+  if (recievedFlag) {
+    lcd.setCursor(4, 1);
+    lcd.print(strData);
+    Serial.println(strData);
+    strData = "";
+    recievedFlag = false;
+  }
+
+ 
+  if (Serial.available()) {
+    esp8266.write(Serial.read());
+  }
+}