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Contribute: Are you a programmer, engineer or designer who has a great idea for a new feature in Bitcoin Bar? Maybe you have a good idea for a bug fix? Feel free to grab the code from Github and tinker with it. Bitcoin Bar: GitHub
Step 1: Parts Required
- 1 x Raspberry Pi 3 or Raspberry Pi Zero W - Amazon
- 1 x LED Matrix Display 32x8 - Amazon
- 1 x 10mm White LED - Amazon
- 1 x 100-ohm Resistor - Amazon
- 1 x 5V USB Power Adapter - Amazon
- 5mm MDF & 5mm Acrylic
Step 2: Electronic Design
Serial Peripheral Interface(SPI) is an interface bus commonly used to send data between microcontrollers and small peripherals such as displays & sensors. It uses separate clock and data lines, along with a chip select line to choose the device you wish to talk to. The LED Matrix Display is connected to the Raspberry Pi's SPI pins.
|Raspberry Pi 3B||LED Matrix Display|
GPIO 10 (MOSI)
GPIO 8 (SPI CE0)
GPIO 11 (SPI CLK)
Step 3: Software
- Requests is an elegant and simple HTTP library for Python. Requests Installation & Documentation.
- Beautiful Soup 4 is a Python library for pulling data out of HTML and XML files. Beautiful Soup Installation & Documentation.
Setup & Configurations:
Once all the Prerequisites have been successfully installed, download/clone this GitHub Repository. Connect the Display to the Raspberry Pi as shown in the Schematics. Run the main program bcbar.py
Bitcoin Bar can display upto 19 different real-time data parameters. These can be configured to be displayed in any order or sequence. The main program displays all 19 data parameters sequentially.
Data parameters can be individually displayed & their order can be changed by configuring the following line in the main program:
show_message(device, disp[i], fill="white", font=proportional(LCD_FONT),scroll_delay = 0.02)
The value of i will determine the data parameter being displayed. Bitcoin Bar can display the following real-time data parameters:
INSERT TABLE WITH PARAMETERS
Scrolling Speed & Static Text
By adjusting the value of scroll_delay, the scrolling speed can be changed. The led_test.pyexample uses the text function to display static text.
The data parameters are web scrapped from bitcoinblockhalf.com. I have limited the number of visits to the site to once per hour so that the website is not burdened with unnecessary traffic. I use this website since it collects several of these data parameters from various other API's & hosts them centrally. Check out the websites repository for more information.
Run Program on Startup/Boot
I followed the official RasPi documentation which modifies the rc.local file in order to run the Python script on boot up.
Are you a programmer, engineer or designer who has a great idea for a new feature in Bitcoin Bar? Maybe you have a good idea for a bug fix? Feel free to grab the code from Github and tinker with it. Bitcoin Bar: GitHub
Step 4: Mechanical Assembly
Bitcoin Bar's enclosure consists of an interlocking box which is laser cut from 5mm MDF. The Front Panel has two slots: one for the LED Display & the other for the Acrylic Diffuser. The Back Panel has a hole for the power supplies USB cable which is plugged into the Raspberry Pi. The Bottom Panel has 4 holes to which the Raspberry Pi is mounted too.
You can find the laser cutting files (for both MDF & Acrylic) below or in the link: Bitcoin Tracker: Laser Cutting
Step 5: Paint the Enclosure
Paint the MDF enclosure to prevent it from getting affected...Read more »