The New Hotness

With the new battery mount & buck converter box installed on Mary’s bike, I updated the running light circuitry to match the ones on my bike. The original wiring just supplied 6.3 V from the headlight circuit, but now the four wire ribbon cable from the electronics box carries 6.3 VDC from the buck converter and a 6 VDC signal going high when the DPC-18 display’s “headlight” output goes active. The latter goes into an optoisolator pulling down Pin 2, telling the running light to stay on continuously.

The optoisolator sits next to the Arduino Nano’s Reset button:

Tour Easy Running Light - unified light top — Tour Easy Running Light – unified light top

The black wire barely visible below the optoisolator jumpers Pin 3 to ground, telling the firmware that this is the front running light.

The black & white wires from the top of the optoisolator connect directly to the ribbon cable entering on the other side:

Tour Easy Running Light - unified light bottom — Tour Easy Running Light – unified light bottom

The gray wrap of clear silicone tape mummifies the wire-to-wire soldered connectors.

The firmware now pays attention to the jumper input, so I need only one source file for both front and rear lights:

    if (digitalRead(PIN_POSITION) == HIGH) {
        Blinks = String("i e  ");             // rear = occulting
        Polarity = true;
    }
    else {
        Blinks = String("n e  ");             // front = blinking
        Polarity = false;
    }

It just doesn’t get much easier than that!

The Arduino source code as a GitHub Gist:

	// Tour Easy Running Light
	// Ed Nisley – KE4ZNU
	// September 2021
	// 2023-03 preprocessorize for front/rear lights
	// 2024-06 input bit for front/rear

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

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

	// Jumper pin low for front light
	#define PIN_POSITION 3

	// Current regulator Enable: positive to turn on
	#define PIN_OUTPUT 13

	String Blinks;
	boolean Polarity;

	// second param: true = active low output
	MorseSender *Morser;

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

	if (digitalRead(PIN_POSITION) == HIGH) {
	Blinks = String("i e "); // rear = occulting
	Polarity = true;
	}
	else {
	Blinks = String("n e "); // front = blinking
	Polarity = false;
	}

	Morser = new LEDMorseSender(PIN_OUTPUT,Polarity,(float)10.0);
	Morser->setup();

	Morser->setMessage(String("qst de ke4znu "));
	Morser->sendBlocking();

	Morser->setSpeed(75);
	Morser->setMessage(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-Unified.ino hosted with ❤ by GitHub

The New Hotness

Tour Easy Running Lights: Updated Lights