This is a collection of Arduino sketches which run as "fast clocks" used in model railroading.
This sketch is a minimal "quick and dirty" fast-clock code which uses the delay() function for timing and the Arduino IDE's Serial Monitor for output. Note that the use of the delay() function causes the timing of the main loop() function to lag a bit because the runtime of the non-delay portion is unknown.
This sketch improves the "quick and dirty" version by eliminating the call to the delay() function and using a call to millis() instead. This is equivalent to the difference between the IDE example sketches Blink and BlinkWithoutDelay. This change makes the timing as accurate as the Arduino's millisecond-clock. The clock output is still written to the Serial Monitor.
This sketch replaces timing code in the .ino file with calls to a StateMachine object to encapsuate the timing logic. Again, the clock output is written to the Serial Monitor.
This sketch replaces output to serial with one of several small external displays. Which one is used is selected by uncommenting one of several #include lines near the top of the FastClock.ino file. At this time, each of the supported displays would be connected to the microcontroller with a Qwiic I2C interface. The Adafruit Metro Mini is one such processor board.
| Header file | Display | Default address | Used address |
|---|---|---|---|
Adafruit_LED.h |
Adafruit 7-Segment Backpack | 0x70 | 0x77 |
SparkFun_Alphanumeric.h |
SparkFun Qwiic Alphanumeric Display | 0x70 | 0x70 |
SparkFun_OLED.h |
SparkFun Qwiic - OLED - (1.3in., 128x64) | 0x3D | 0x3D |