//// Hello YouTube! on ESP-12 and AdaFruit I2C LED Matrix// Hari Wiguna, 2015//#include <Wire.h>#include "Adafruit_LEDBackpack.h"#include "Adafruit_GFX.h"
Adafruit_8x8matrix matrix = Adafruit_8x8matrix();
int offset = 0;
String msg = " Hello YouTube! ";
int msgLength = msg.length();
voidsetup(){
pinMode(A0, INPUT);
Wire.pins(0,2); // <-- IMPORTANT!!! call this BEFORE initializing AdaFruit matrix (which calls wire.begin() with no parameters!
matrix.begin(0x70); // pass in the address
}
voidloop(){
// Draw the message with increasing negative offset to "scroll" itfor (int i = 0; i < msgLength; i++)
matrix.drawChar(i*6 - offset, 0, msg[i], 1, 0, 1);
matrix.writeDisplay(); // Actually update the displayif (offset++ >= msgLength*6) offset = 0;
// NOTE: ESP8266's ADC pin has a max of 1V that maps to 1023// See Voltage Divider in wiring diagram.int potentiometer = analogRead(A0);
int dly = map(potentiometer, 0, 950, 300, 30); // In theory upper should be 1023, but in practice it only reach 1000
delay(dly);
}