Using an I2C / SPI LCD on the Spark Core

Hardware
112

@NanoAkron, the short answer is via USB using dfu-utils and the Spark CLI comes in hand as well. There is another trick, however, that I used at the Maker Fair since the wifi there was bad at best! I define a pin on the Spark as a “WiFi enable” pin and check it in setup(). The Core starts with wifi and cloud off and if the pin is grounded, I turn them both ON:

#include "spark_disable_wlan.h"
#include "spark_disable_cloud.h"

//...

#define WIFI_JUMPER	D0    //Can be any pin

void setup()
{
	pinMode(WIFI_JUMPER, INPUT_PULLUP);
	if (digitalRead(WIFI_JUMPER) == HIGH) {
		WiFi.on();
		while (WiFi.status() != WIFI_ON)	//Wait for wifi to come ON
			SPARK_WLAN_Loop();
			
		Spark.connect();
		while (!Spark.connected())
			SPARK_WLAN_Loop();
	}

	//... rest of your code
}

So if you power up/reset your Core with the pin OPEN, it will enable wifi. With the pin shorted to ground, wifi will remain OFF and your code will run as usual. :smile: