diff --git a/lcd_c/Makefile b/lcd_c/Makefile
index f20a956..73e8c4e 100644
--- a/lcd_c/Makefile
+++ b/lcd_c/Makefile
@@ -2,7 +2,7 @@ CC = avr-gcc
 OBJCOPY = avr-objcopy
 AVRDUDE = avrdude
 CFLAGS = -Os -DF_CPU=16000000UL -mmcu=atmega328p 
-SERIAL = /dev/cu.usbmodem141401
+SERIAL = /dev/cu.usbmodem143401
 ADDR = $(shell heptc -where)/c
 TARGET = lcd
 
diff --git a/lcd_hept/Makefile b/lcd_hept/Makefile
index b5b61fd..7d5678e 100644
--- a/lcd_hept/Makefile
+++ b/lcd_hept/Makefile
@@ -2,7 +2,7 @@ CC = avr-gcc
 OBJCOPY = avr-objcopy
 AVRDUDE = avrdude
 CFLAGS = -Os -DF_CPU=16000000UL -mmcu=atmega328p 
-SERIAL = /dev/cu.usbmodem141401
+SERIAL = /dev/cu.usbmodem143401
 ADDR = $(shell heptc -where)/c
 TARGET = prog
 LIB = arduinolib
diff --git a/lcd_hept/arduinolib.c b/lcd_hept/arduinolib.c
index 586433e..cd23d10 100644
--- a/lcd_hept/arduinolib.c
+++ b/lcd_hept/arduinolib.c
@@ -1,4 +1,3 @@
-//#include <math.h>
 #include <avr/io.h>
 #include <util/delay.h>
 #include "arduinolib.h"
@@ -125,29 +124,22 @@ void Arduinolib__lcd_char_step(uint8_t char_data, Arduinolib__lcd_char_out *out)
 }
 
 /* give a string to display to the LCD */
-void Arduinolib__lcd_string_step(uint8_t lstring[], Arduinolib__lcd_string_out *out){
-
-    //uint8_t lstring = atoi(message);
+void Arduinolib__lcd_string_step(uint8_t lstring[], int line, Arduinolib__lcd_string_out *out){
+
+    Arduinolib__lcd_cmd_out *o1;
+    Arduinolib__lcd_cmd_out *o2;
+    if (line == 1) { 
+        Arduinolib__lcd_cmd_step(LCD_CURSOR_SET | LCD_START_LINE2, o1);
+        _delay_us(80); //more than 
+    } else {
+        Arduinolib__lcd_cmd_step(LCD_CURSOR_SET | LCD_START_LINE1, o2);
+        _delay_us(80);
+    }
     volatile int i = 0;
     for (i = 0; lstring[i] != 0 ; i++) {
-        Arduinolib__lcd_char_out *o1;
-        Arduinolib__lcd_char_step(lstring[i], o1);
+        Arduinolib__lcd_char_out *o3;
+        Arduinolib__lcd_char_step(lstring[i], o3);
         _delay_us(80); //more than 39us
     }
 }
 
-/*uint8_t msg[] = "Arduino";
-uint8_t msg2[] = "Hello world";
-
-int main(void) {
-    Arduinolib__dinit_step();
-    Arduinolib__lcd_init_step();
-    Arduinolib__lcd_string_step(msg);
-    Arduinolib__lcd_cmd_step(LCD_CURSOR_SET | LCD_START_LINE2);
-    _delay_us(80); // more than 39us
-    Arduinolib__lcd_string_step(msg2);
-
-    while(1);
-    return 0;
-}*/
-
diff --git a/lcd_hept/arduinolib.epi b/lcd_hept/arduinolib.epi
index 0c0a718..bdc6b49 100644
--- a/lcd_hept/arduinolib.epi
+++ b/lcd_hept/arduinolib.epi
@@ -5,4 +5,4 @@ fun lcd_init() returns ()
 fun lcd_write(info:uint8_t) returns ()
 fun lcd_cmd(cmd:uint8_t) returns ()
 fun lcd_char(char_data:uint8_t) returns ()
-fun lcd_string (lstring:uint8_t) returns ()
+fun lcd_string (lstring:string; line: int) returns ()
diff --git a/lcd_hept/arduinolib.h b/lcd_hept/arduinolib.h
index 0674500..776f589 100644
--- a/lcd_hept/arduinolib.h
+++ b/lcd_hept/arduinolib.h
@@ -57,11 +57,3 @@
 #define LCD_CURSOR_SET  0b10000000
 #define LCD_FUNCTION_SET_8bit   0b00110000
 #define LCD_FUNCTION_SET_4bit   0b00101000
-
-// Functions
-/*void dinit(void);
-void lcd_init(void);
-void lcd_write(uint8_t);
-void lcd_cmd(uint8_t);
-void lcd_char(uint8_t);
-void lcd_string(uint8_t *);*/
\ No newline at end of file
diff --git a/lcd_hept/arduinolib_types.h b/lcd_hept/arduinolib_types.h
index ff409a4..d8013e1 100644
--- a/lcd_hept/arduinolib_types.h
+++ b/lcd_hept/arduinolib_types.h
@@ -39,6 +39,6 @@ void Arduinolib__lcd_cmd_step(uint8_t cmd, Arduinolib__lcd_cmd_out *o);
 
 void Arduinolib__lcd_char_step(uint8_t char_data, Arduinolib__lcd_char_out *o);
 
-void Arduinolib__lcd_string_step(uint8_t lstring[], Arduinolib__lcd_string_out *o);
+void Arduinolib__lcd_string_step(uint8_t lstring[], int line, Arduinolib__lcd_string_out *o);
 
 #endif
\ No newline at end of file
diff --git a/lcd_hept/main.c b/lcd_hept/main.c
index 6b0d724..fbe9577 100644
--- a/lcd_hept/main.c
+++ b/lcd_hept/main.c
@@ -2,7 +2,6 @@
 #include <util/delay.h>
 #include "main.h"
 
-//#define BLINK_DELAY_MS 4000
 
 int main (void)
 {
diff --git a/lcd_hept/prog.ept b/lcd_hept/prog.ept
index 19088e4..bea0445 100644
--- a/lcd_hept/prog.ept
+++ b/lcd_hept/prog.ept
@@ -1,10 +1,26 @@
 open Arduinolib
 
-node main() returns ()
+node update_lcd<<period, ledMax : int; msg : string; line: int >>() returns ()
 var i : int;
+    ledTime : int;
+    upt : bool;
+    downt : bool;
+
+let
+    i = 0 fby (i+1);
+    ledTime = i % period;
+    upt = ledTime < ledMax;
+    downt = not upt;
+
+    () = lcd_string((msg, line) when upt);
+    () = lcd_string((".", line) when downt);
+tel
+
+node main() returns ()
 let 
-  i = 0 fby (i+1);
-  () = dinit();
+  () =  dinit();
   () = lcd_init();
+  () = update_lcd<<6, 4, "Hello", 0>>();
+  () = update_lcd<<10, 5, "Hi", 1>>();
 tel
 
diff --git a/parallel_led/arduinolib.c b/parallel_led/arduinolib.c
index 2ab4aa3..97ad4ba 100644
--- a/parallel_led/arduinolib.c
+++ b/parallel_led/arduinolib.c
@@ -1,32 +1,25 @@
-//#include <math.h>
 #include <avr/io.h>
 #include <util/delay.h>
 #include "arduinolib.h"
-//#include "HardwareSerial.h"
 
 void Arduinolib__dwrite_step(int p, int v, Arduinolib__dwrite_out *out){
-    /* set pin 5 of PORTB for output. i.e port 13 */
-    if (p == 13){
-        DDRC |= _BV(DDD7);
-        if (v == 0)
-        {
-            PORTD &= ~(1<<PORTD7);
-            //PORTB &= ~_BV(PORTB5); //put it to low
-            return;
-        }
-        PORTD |= (1<<PORTD7);
-        //PORTB |= _BV(PORTB5);
-        return;
+
+    if (8 <= p && p <= 13){
+        int pin = p - 8;
+        DDRB |= (1 << pin);
+        PORTB |= (1 << pin);
+        if (v == 0) PORTB &= ~(1 << pin);
+    }
+    else if ( 0 <= p && p <= 7){
+        DDRD |= (1 << p);
+        PORTD |= (1 << p);
+        if (v == 0) PORTD &= ~(1 << p);
     }
-    DDRD |= _BV(DDD5);
-    if (v == 0)
-    {
-        PORTD &= ~(1<<PORTD5);
-        //PORTB &= ~_BV(PORTB4); //put it to low
-        return;
+    else { //by default
+        DDRB |= (1 << 5);
+        PORTB |= (1 << 5);
+        if (v == 0) PORTB &= ~(1 << 5);
     }
-    PORTD |= (1<<PORTD5);
-    //PORTB |= _BV(PORTB4);
     return;
 }
 
diff --git a/parallel_led/arduinolib_types.h b/parallel_led/arduinolib_types.h
index 0570697..901aa11 100644
--- a/parallel_led/arduinolib_types.h
+++ b/parallel_led/arduinolib_types.h
@@ -1,8 +1,6 @@
 #ifndef ARDUINOLIB_H
 #define ARDUINOLIB_H
-//#include "Arduino.h"
-//#include "WConstants.h"
-/* Example of a combinatorial function */
+
 typedef struct Arduinolib__dwrite {
 } Arduinolib__dwrite_out;
 
diff --git a/parallel_led/main.c b/parallel_led/main.c
index 6b0d724..108f5b6 100644
--- a/parallel_led/main.c
+++ b/parallel_led/main.c
@@ -2,8 +2,6 @@
 #include <util/delay.h>
 #include "main.h"
 
-//#define BLINK_DELAY_MS 4000
-
 int main (void)
 {
  Prog__main_mem mem;
diff --git a/parallel_led/prog.ept b/parallel_led/prog.ept
index 47175e7..8a5201a 100644
--- a/parallel_led/prog.ept
+++ b/parallel_led/prog.ept
@@ -20,5 +20,6 @@ node main() returns ()
 let
   () = led<<3, 1, 13>>();
   () = led<<4, 2, 9>>();
+  () = led<<3, 1, 5>>();
 tel