An LED Matrix that counts subscribers (and cryptocurrency prices) in realtime.
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README.md

Realtime Subscriber Counter / Cryptocurrency Ticker

An LED Matrix that counts subscribers (and cryptocurrency prices) in realtime.

Watch the video about how to make it here.

See more instructions about how to make it on hackster.io.

Pre-requisites

  • Python 2.7
  • pip
  • Raspbian

Wiring

Board Pin Name Remarks RPi Pin RPi Function
1 VCC +5V Power 2 5V0
2 GND Ground 6 GND
3 DIN Data In 19 GPIO 10 (MOSI)
4 CS Chip Select 24 GPIO 8 (SPI CE0)
5 CLK Clock 23 GPIO 11 (SPI CLK)

Install Dependencies

Before you run the program, make sure to install dependencies. Navigate to the project directory and run

pip install -r requirements.txt

to install the python dependencies.

Enable the SPI driver for the max7219 LED module to work properly.

sudo raspi-config

Scroll down to Advanced Options (Interfacing Options on the Pi Zero) and press enter.

Scroll down to SPI, press enter, and select yes.

Reboot.

Running the Program

The ticker.py program runs in three different modes: live subscriber counter, live cryptocurrency price, and cryptocurrency ticker.

Live Subscriber Counter

To run the program in live subscriber mode, you can run the program with the following arguments:

python ticker.py --youtubeApiKey API_KEY --channelId CHANNEL_ID

Where CHANNEL_ID is replaced with the channel ID from your youtube channel URL. (For instance Hacker House has the channel ID UCEcNXmr7DYq1XxpWHSxaN0w from https://www.youtube.com/channel/UCEcNXmr7DYq1XxpWHSxaN0w) and API_KEY is replaced with an API key from the Youtube Data API.

You can obtain an API key for the Youtube Data API by visiting the Google developer console. Search for "Youtube Data API" and enable the API. Once the API has been enabled, visit the API settings page and click credentials in the left rail. On the credentials page, click Create credentials and select API Key.

Cryptocurrency Price

You can also display the price of your favorite cryptocurrency by using the following arguments:

python ticker.py --crypto ETH

Where ETH can be replaced with your favorite cryptocurrency symbol. You can obtain the symbol for your cryptocurrency by searching https://coinmarketcap.com/ for it.

Cryptocurrency Ticker

To run the LED bar in Cryptocurrency ticker mode, use the following arguments:

python ticker.py --ticker

By default, it shows the prices for a list of 11 cryptocurrencies. You can add more by modifying the cryptos variable in ticker.py here. Simply add your symbols to the end of the list.

Running on Startup

To run the program on startup, open your rc.local file with Vim.

sudo vim /etc/rc.local

Press i to edit, scroll to the line before exit 0 and add

python /full/path/to/ticker.py --ticker

(Or add other options) and press esc then ZZ to save and exit.