💣 ExitGame Bomb - ⏲ Countdown Timer

This countdown timer is part of an ExitGame where payers have to deactivate a bomb by coding challenges.
The timer runs a second based countdown in the format "00:00".
The countdown can be controlled by a REST interface.

💡 Hardware

The code runs on an Arduino compatible Adafruit Feather HUZZAH with ESP8266.
It controls a SparkFun 7-Segment Serial Display. So wee don't need to manual control each segment. Instead serial data can be sent.

🔌 Endpoints

Name	Method	Param	Description
start	GET	time [ms]	Starts the countdown timer with the given time.
stop	GET	time [ms]	Stops the countdown timer and displays the finish time.
resume	GET	-	Restarts the countdown.
disable	GET	-	Deactivates the timer, so all lights are off.

🔧 Setup

1. Install Arduino IDE
2. Setup the Arduino IDE for the Adafruit Feather HUZZAH
3. Install the aREST lib:
   Tools > Manage Libraries.. Search & install aREST (v2.7.5 by Marco Schwartz)
4. Open the timer.ino in the Arduino IDE.
5. Change the variables ssid and password to match your W-LAN credentials.
6. Verify, Compile & Upload the sketch to the board.
7. Connect the the Feather board with the 7-Segment Serial Display. Add a 5V power supply:
   The timer shows "Connecting" and "Ready" after connecting to a WLAN.

Feather - PIN	Connect	7 Segment - PIN
VCC	⟷	USB
GND	⟷	GND
RX	⟷	16

8. Test the timer by sending a GET to it's IP with start?time=120000.