Bitcoin $ Price Tracker Using ESP32 & OLED Display

Overview

In this project, we will build a Bitcoin Price Tracker Using ESP32 WiFi Module & OLED Display. The device can be programmed to display the current Bitcoin price in US dollars. The best part of this system is you could set the device to display any cryptocurrency in any local currency. This can only be possible if there is an API available on one of the exchanges.

The Bitcoin Price Tracker is designed using the ESP32 development board, which has built-in WiFi. It connects to your WiFi network and fetches the updated Bitcoin price through the Coindesk API every 15 minutes. Along with the Bitcoin price, the device also displays the percentage change from yesterday’s closing price. It also lights up either a red or green LED depending on whether the price has increased or decreased.

The code is based on Michael Klements project, with some slight modification. Using this guide you can build your own Bitcoin Price Tracker with ESP32 & OLED Display.

Bill of Materials

We need the following components to build this project. You can purchase all these components from Amazon.

Hardware Setup & Circuit

The circuit for Bitcoin Price Tracker is very simple. I used fritzing Software to design the schematic.

Connect the SDA & SCL Pin of OLED Display to D21 & D22 of ESP32 Module. Connect the red & green LED to D18 & D19 respectively via 200-ohm resistor. Power the OLED Display using the 3.3V & GND pin of ESP32. The red LED here indicates the price of Bitcoin is going down while the green LED indicates the rise in Bitcoin price.

I used a breadboard to assemble the circuit as per the circuit diagram. You can build your own custom PCB for this project.

Project PCB Gerber File & PCB Ordering Online

If you don’t want to assemble the circuit on a breadboard and you want PCB for the project, then here is the PCB for you. I used EasyEDA to design the PCB. The PCB Board for Bitcoin Price Tracker looks something like below.

The Gerber File for the PCB is given below. You can simply download the Gerber File and order the PCB from ALLPCB at 1$ only.

You can use this Gerber file to order high quality PCB for this project. To do that visit the ALLPCB official website by clicking here: https://www.allpcb.com/.

You can now upload the Gerber File by choosing the Quote Now option. From these options, you can choose the Material Type, Dimensions, Quantity, Thickness, Solder Mask Color and other required parameters.

After filling all details, select your country and shipping method. Finally you can place the order.

You can assemble the components on the PCB Board.

Source Code/Program

The code/program for the Bitcoin Price Tracker is written on Arduino IDE with all necessary libraries installed on the system. Before moving to the code part, first, we need to add the following libraries to the Arduino library folder.

1. Adafruit SSD1306 Library: https://github.com/adafruit/Adafruit_SSD1306
2. NTP Client Library: https://github.com/arduino-libraries/NTPClient
3. Arduino JSON Library: https://github.com/bblanchon/ArduinoJson

In the below code part, you need to change the WiFi SSID & Password & replace with that of your local network.

Here is the complete code for this project. Copy it and upload it to your ESP32 Board.

Testing the Bitcoin $ Price Tracker

After uploading the code, the ESP32 Module will try connecting to the WiFi Network using the Network credentials provided in the code. Once it gets connected, it will try to fetch the data using the given API & will display parameters on Serial Monitor.

On the other hand, the OLED will boot up with Bitcoin Logo initially.

Once the device connects to the WiFi Network it will display the current Bitcoin price along with the change in Bitcoin value since yesterday date. If the bitcoin price is decreasing the Red LED will turn ON.

In case, if the Bitcoin price value is increasing the green LED will turn ON.

If you enjoy cryptocurrencies, then take a look at the video below with full guide.

Video Tutorial & Guide