guerillaClock, a low cost countdown clock, provides bus arrival time by way of 16x32 RBG matrix backed by a Raspberry Pi Zero W.

It is a $100 solution to a $25,000 problem.

The project utilizes a custom designed 3D printed enclosure to house a 16x32 RGB matrix and costs approximately $100. (The price could be reduced if a smaller lipo was used, or omitted entirely.)

The Raspberry Pi Zero W connects to a local wifi network and pulls bus arrival time and route details from the NYC MTA Bus Time API. The 16x32 matrix displays the "next" bus' arrival time, for a selected bus stop.

The display is controlled with hzeller's great rpi-rgb-led-matrix repo project. The wiring.md was especially helpful in creating a Pi HAT, utilizing the Adafruit Perma Proto Bonnet.

More information can be found on hackaday.io.

• README.md: This file.
• guerillaClock.py: Scrape the NYC MTA Bus Time API and gather information about a designated bus stop.
• guerillaClockDisplay.py: Display and scroll arrival time information on a 16x32 RGB matrix.
• guerillaClockHAT_pinout.md: Table explaining the pinout between the Raspberry Pi Zero W, Adafruit Bonnet, and 16x32 matrix.

• 1 × 16x32 RGB LED Matrix - $24.95
• 1 × Raspberry Pi Zero W - $10
• 1 × Adafruit Perma Proto Bonnet Mini - $4.50
• 1 × 4GB Micro SD Card (https://www.amazon.com/Sandisk-MicroSDHC-Memory-Card-Adapter/dp/B000SMVQK8) - $9.71
• 1 × PowerBoost 1000C (https://www.adafruit.com/product/2465) - $19.95
• 1 × Lithium Ion Battery - 3.7V 6600mAh (https://www.adafruit.com/product/353) - $29.50
• 1 × Rocker Switch SPST 2Pin (http://tinkersphere.com/buttons-switches/1039-rocker-switch-spst-2-pin.html) - $1.49
• 1 × Various Srews: M2.5 and M4