Added the modifications to work on arduino UNO

almost the same features for arduino MEGA, now for arduino UNO!

Microcontroller_Code/UNO/UNO_newmod.ino

@@ -0,0 +1,139 @@
+/*
+ * UNO.ino
+ *
+ * Created: 11/12/2016 19.35.51
+ * Author : Vincenzo
+ * Led on A0
+ */ 
+
+#define baudrate 115200 // check if it is the same in processing
+#define samples 200		// the number of samples you want to take
+#define timezerooffset 125 //microsegundos
+#define F_CPU 16000000UL
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <util/delay.h>
+#define prescaler 0x02
+volatile uint16_t timer1_overflow_count;
+
+uint8_t initial, state, old_state;
+uint8_t pinChanged[samples];
+uint32_t timer[samples];
+uint32_t timefix;
+uint16_t event = 0;
+
+void init_board() {
+  
+  PORTC = (0 << 0); DDRC |= (1 << 0); // led A0
+  DDRB |= 0x00;     // pin 8-13 input
+  PORTB |= 0x3F;    // pull-up
+  
+}
+
+void init_timer() {
+
+  //clear
+  TCCR1A = 0b00000000;
+  TCCR1B = 0b00000000;
+  TIMSK1 = 0b00000000;
+
+  //settings
+  TCCR1A |= (0 << COM1A1) | (0 << COM1A0) | (0 << COM1B1) | (0 << COM1B0); //normal port operation
+  TCCR1A |= (0 << WGM11) | (0 << WGM10); //normal operation
+  TCCR1B |= (0 << WGM13) | (0 << WGM12); //normal operation
+  TCCR1B |= prescaler; //(0 << CS12) | (0 << CS11) | (1 << CS10); //clock prescaler
+
+  sei();    //enable interrupts
+  TIMSK1 |= (1 << TOIE1);   // enable overflow interrupt
+
+}
+
+ISR(TIMER1_OVF_vect) {
+  timer1_overflow_count++;
+}
+
+void reset_timer1 () {
+  TCNT1 = 0;
+  timer1_overflow_count = 0;
+}
+
+uint32_t myMicros () {
+  cli();
+
+  if (TIFR1 & (1 << TOV1)) {
+    TIFR1 = (0 << TOV1);
+    timer1_overflow_count++;
+  }
+  
+  uint32_t total_time = (65536 * timer1_overflow_count + TCNT1) / 2;
+  sei();
+  return total_time;
+}
+
+void start() {
+  _delay_ms(1000);
+
+  reset_timer1();
+  event = 0;
+
+  PORTC = (1 << 0);
+  initial = PINB;
+  state = initial;
+  for (int i=0;  i < samples; i++) {
+    pinChanged[i]=0;
+    
+  }
+}
+
+
+void sendData() {
+  PORTC = (0 << 0);   //turn off led
+
+  //initial data
+    Serial.println("S");
+  Serial.print(initial); Serial.print(','); Serial.print(B11111111); Serial.print(','); Serial.print(B11111111); Serial.print(":");
+  Serial.println(samples+3);
+  timefix = -timer[0]+timezerooffset;
+  for (int i = 0; i < samples; i++) {
+    timer[i]=timer[i]+timefix;
+  }
+  Serial.print(B11111111);Serial.print(','); Serial.print(B11111111); Serial.print(','); Serial.print(B11111111); Serial.print(":");//Este segmento de codigo introduce un cambio en todos los 
+  Serial.println(0);                                                                                                                //canales, lo que soluciona un error en el codigo en processing
+  Serial.print(B11111111);Serial.print(','); Serial.print(B11111111); Serial.print(','); Serial.print(B11111111); Serial.print(":");//al final se hace un cambio en todos los canales, lo que soluciona
+  Serial.println(1);                                                                                                                //otro pequeño fallo visual.
+  //data
+  for (int i = 0; i < samples; i++) {
+    Serial.print(pinChanged[i]);Serial.print(','); Serial.print(B00000000); Serial.print(','); Serial.print(B00000000); Serial.print(":");
+    Serial.println(timer[i]);
+  }
+  Serial.print(B11111111);Serial.print(','); Serial.print(B11111111); Serial.print(','); Serial.print(B11111111); Serial.print(":");
+  Serial.println((timer[samples-1]+400));
+}
+
+
+int main(void) {
+  Serial.begin(baudrate);
+  
+  init_board();
+  init_timer();
+
+  start();
+
+  while (1) {
+    
+    old_state = state;
+    state = PINB;
+  
+  if (old_state != state) {
+    timer[event] = myMicros();
+    pinChanged[event] = state ^ old_state;
+    event++;
+
+    if (event == samples) {
+      sendData();
+      while (Serial.read() != 'G') ;  //wait for the "go"
+      start();
+    }
+    }
+  }
+}