The New Hotness

The optoisolator carrying the Bafang controller’s LIGHT signal pulls Pin 2 down to turn the LED on constantly for night riding:

    if (!Morser.continueSending())
        if (digitalRead(PIN_LIGHTMODE) == HIGH)
            Morser.startSending();
        else
            digitalWrite(PIN_OUTPUT,HIGH);      // constantly turn on in headlight mode

That’s the entirety of the program’s loop() function, so there’s not much to the firmware.

Imagine that: a whole computer devoted to sampling an input bit a zillion times a second and persistently setting an output bit:

Tour Easy Running Light - Arduino view — Tour Easy Running Light – Arduino view

The Morse output to the rear is now “s” rather than “i” for more blinkiness, but I doubt anybody will ever notice.

The next time I raise the hood on this thing, I’ll add a digital input to select FRONT or REAR mode to get me out of having to remember which hardware goes where.

The Arduino source code as a GitHub Gist:

	// Tour Easy Running Light
	// Ed Nisley – KE4ZNU
	// September 2021
	// 2023-03 preprocessorize for front/rear lights

	// https://github.com/markfickett/arduinomorse
	#include <morse.h>

	// Bafang headlight output pulls pin low
	#define PIN_LIGHTMODE 2

	#define PIN_OUTPUT 13

	#define FRONT

	#if defined(FRONT)
	#define BLINKS "b e "
	#define POLARITY false

	#elif defined(REAR)
	#define BLINKS "s "
	#define POLARITY true

	#else
	#error "Needs FRONT or REAR"

	#endif

	// second param: true = active low output
	LEDMorseSender Morser(PIN_OUTPUT,POLARITY,(float)10.0);

	void setup()
	{
	pinMode(PIN_LIGHTMODE,INPUT_PULLUP);

	Morser.setup();

	Morser.setMessage(String("qst de ke4znu "));
	Morser.sendBlocking();

	Morser.setSpeed(75);
	Morser.setMessage(String(BLINKS));
	}

	void loop()
	{
	if (!Morser.continueSending())
	if (digitalRead(PIN_LIGHTMODE) == HIGH)
	Morser.startSending();
	else
	digitalWrite(PIN_OUTPUT,HIGH); // constantly turn on in headlight mode

	}

view raw RunningLight.ino hosted with ❤ by GitHub

The New Hotness

Tour Easy Running Lights: Firmware