diff --git a/module05/ex00/adc.h b/headers/adc.h
similarity index 100%
rename from module05/ex00/adc.h
rename to headers/adc.h
diff --git a/module05/ex00/adc.c b/module05/ex00/adc.c
index 12a2ccc..4e0e062 100644
--- a/module05/ex00/adc.c
+++ b/module05/ex00/adc.c
@@ -10,18 +10,16 @@
 // - disabling the Power Reduction ADC bit, PRADC
 // - writing a logical one to the ADC Start Conversion bit, ADSC
 
-#define ADC_PRESCALER	8
-
-void adc_init() {
-    ADMUX = (1 << REFS0);						// Table 24-3 : set voltage reference, AVCC with external capacitor at AREF pin
-    ADCSRA = (1 << ADEN) 						// 24.9.2 : enable ADC
-           | ADC_PRESCALE_SET(ADC_PRESCALER);	// Table 24-5 : prescaler ADC
+void adc_init(uint8_t prescaler_value) {
+    ADMUX = (1 << REFS0);								// Table 24-3 : set voltage reference, AVCC with external capacitor at AREF pin
+    ADCSRA = (1 << ADEN); 								// 24.9.2 : enable ADC
+    ADCSRA |= ADC_PRESCALE_SET(prescaler_value);		// Table 24-5 : prescaler ADC
 }
 
 uint16_t adc_read(uint8_t channel) {
-	CLEAR(PRR, PRADC);							// 24.3 : ensure power reduction is disabled for ADC, (10.11.3 : PRR – Power Reduction Register)
-    ADMUX = (ADMUX & 0xF0) | (channel & 0x0F);	// Select ADC channel
-    ADCSRA |= (1 << ADSC);						// 24.9.2 : Start conversion, ADSC: ADC Start Conversion
-    while (ADCSRA & (1 << ADSC));				// Wait for completion
+	CLEAR(PRR, PRADC);									// 24.3 : ensure power reduction is disabled for ADC, (10.11.3 : PRR – Power Reduction Register)
+    ADMUX = (ADMUX & 0b11110000) | (channel & 0b1111);	// Table 24-4 : Select ADC channel, (Table 14-6 : alternate function for RV1 on PC0 -> ADC0)
+    ADCSRA |= (1 << ADSC);								// 24.9.2 : Start conversion, ADSC: ADC Start Conversion
+    while (ADCSRA & (1 << ADSC));						// Wait for completion
     return ADC;
 }
diff --git a/module05/ex00/header.h b/module05/ex00/header.h
index cf16a69..6b7ea32 100644
--- a/module05/ex00/header.h
+++ b/module05/ex00/header.h
@@ -18,13 +18,13 @@
 // main.c
 void int_to_hex_string(uint64_t value, char *out, uint8_t num_digits);
 // adc.c
-void adc_init();
+void adc_init(uint8_t prescaler_value);
 uint16_t adc_read(uint8_t channel);
 // uart.c
 void uart_init();
 void uart_tx(char c);
 void uart_printstr(const char* str);
-void uart_printstr_endl(const char* str) 
+void uart_printstr_endl(const char* str);
 
 //
 // MACROS
diff --git a/module05/ex00/main.c b/module05/ex00/main.c
index 8a7bf92..b885c02 100644
--- a/module05/ex00/main.c
+++ b/module05/ex00/main.c
@@ -1,6 +1,11 @@
 #include "header.h"
 
-void int_to_hex_string(uint64_t value, char *out, uint8_t num_digits) {
+// 1.1.7 : AVCC is the supply voltage pin for the A/D Converter, PC3:0, and ADC7:6
+// 1.1.8 : AREF is the analog reference pin for the A/D Converter
+
+#define ADC_PRESCALER	8
+
+void int_to_hex_string(uint64_t value, char *out, uint8_t num_digits) {				// num_digits : number of digit of the output, ex 2 for 3FF (1023) -> FF
     for (uint8_t i = 0; i < num_digits; ++i) {
         uint8_t shift = (num_digits - 1 - i) * 4;
         out[i] = INT_TO_HEX_CHAR((value >> shift) & 0x0F);
@@ -10,10 +15,10 @@ void int_to_hex_string(uint64_t value, char *out, uint8_t num_digits) {
 
 // description
 int main() {
-    const char buffer[4];
+    char buffer[4];
 	SREG |= ENABLE_GLOBAL_INTERRUPT;												// 7.3.1 : Status Register, bit 7 : I – Global Interrupt Enable
 	uart_init();
-	adc_init();
+	adc_init(ADC_PRESCALER);
 
 	while(1) {
         uint16_t value = adc_read(0);												// Read from ADC0 (A0)