lab_timer

The timer requires a supply voltage of 10 to 30 V

Set up project

1. Install platformio in vscode
2. Open this repo with platfomio
3. Build the project

Modes

Mentioned defines can be set in /lib/glob_defines/glob_defines.h

1. “Airplaine” mode
   • How to enter it: Press the button at the top when powering up or set AIRPLAINE_MODE true
   • The ESP will not connect to the WLAN and will not communicate with the cars.
   • Simply switch the car mode to active as well
2. Mode "Just toggle cars":
   • How to enter it: set JUST_TOGGLE_CARS true
   • If the cars are not able to communicate their progress or position, use this mode.
   • This mode assumes that the cars will not overtake each other.
   • The timers only switch when passing.
3. Drive with one car
   • Input: set the ID of CAR_B to -1
   • May only work in airfield mode. Not tested
   • Function get_car_on_finish_line() in main will always return CAR_A

Communication

The cars and the lab timer communicate via web hooks.

sequenceDiagram
    ESP Timer->>+CAR n: get ready
    Remote n->>+CAR n: dead man's switch
    CAR n->>+ESP Timer: ready
    ESP Timer->>+ESP Timer: wait for all cars or timeout
    ESP Timer->>+ESP Timer: Play start sequence
    ESP Timer->>+CAR n: start race
    CAR n->>+CAR n: race
    CAR n->>+ESP Timer: abort
    ESP Timer->>+CAR n: abort

Loading

Dot Matrix Display (DMD)

This display is used to display the current lap time. The display type is called HUB12 because it has only white leds.

Useful links

• HUB explanation
• Currently used matrix panel driver lib KERNEL-VERSION NEEDS TO be @ 2.0.2
• Alternative driver
• Pinout of the used DMD
• "User Manual"