const int CH1_PIN = 14;
const int CH2_PIN = 15;
const int CH3_PIN = 16;
const int CH4_PIN = 17;
const int CH5_PIN = 18;
const int CH6_PIN = 19;
const int CH7_PIN = 20;
const int CH8_PIN = 21;
const int CH9_PIN = 22;
const int CH10_PIN = 23;
const int CH11_PIN = 24;
const int CH12_PIN = 25;
const int CH13_PIN = 26;
const int CH14_PIN = 27;
const int CH15_PIN = 28;
const int CH16_PIN = 29;